A heat dissipation system for an explosion-proof device

Abstract

The application provides a heat dissipation system for an explosion-proof device, comprising: an explosion-proof box body for accommodating an electrical device, in a closed structure, having a box body first wall; turbulence devices arranged in an array on the inner side of the box body first wall; an impinging jet device arranged on the inner side of the box body first wall; the impinging jet device comprises: an impinging jet plate sealingly connected to the inner side of the box body first wall and forming a jet cavity with the box body first wall; the top end of the turbulence device has a spacing with the impinging jet plate; a jet fan arranged on the impinging jet plate and blowing air towards the box body first wall; and an air outlet arranged on the impinging jet plate and enabling the airflow in the jet cavity to flow back into the explosion-proof box body. The heat dissipation system overcomes the defect that the prior art explosion-proof device is difficult to dissipate heat under a fully closed structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat dissipation of explosion-proof equipment, and particularly relates to a heat dissipation system for explosion-proof equipment. BACKGROUND

[0002] The explosion-proof electrical equipment is mainly used in coal, petroleum and chemical industry and other places containing flammable and explosive gas and dust. The electrical equipment used in explosive hazardous environment should be able to prevent sparks, arcs or dangerous temperature from becoming an ignition source of the installation site explosive mixture in use. The general explosion-proof measures mainly adopt the explosion-proof mode, that is, the related electrical elements are wrapped in a fully enclosed explosion-proof box to isolate the external explosive hazard source from contacting the electrical elements. With the development of miniaturization and integration of electrical elements, the device size is reduced and the heat flux density is significantly increased, which puts forward more severe requirements for the heat dissipation of electronic devices in the mine closed explosion-proof box. For example, the current intelligentization is an inevitable trend of high-quality development of the coal industry, and under the support of 5G wireless Internet of Things technology, the intelligent development of coal mines in China is rapid. The wireless Internet of Things system of coal mine is mainly composed of core network, baseband processing unit (BBU), base station, signal converter, intrinsically safe 5G terminal and bearer network. However, the wireless Internet of Things equipment belongs to high-heat electronic equipment, and it is difficult to dissipate heat in time when it is enclosed in the explosion-proof box, which becomes a problem restricting the application of mine wireless Internet of Things. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is to overcome the defect that the existing explosion-proof equipment is difficult to dissipate heat under the fully enclosed structure.

[0004] To solve the above technical problems, the present application provides a heat dissipation system for explosion-proof equipment, comprising:

[0005] An explosion-proof box body is used for accommodating electrical equipment, and has a closed structure and a box body first wall; and turbulence devices are arranged in an array on the inner side of the box body first wall;

[0006] An impact jet device is arranged on the inner side of the box body first wall;

[0007] The impact jet device comprises:

[0008] An impact jet plate is sealingly connected to the inner side of the box body first wall and forms a jet cavity with the box body first wall; and the top end of the turbulence device has a spacing with the impact jet plate;

[0009] A jet fan is arranged on the impact jet plate and blows air towards the box body first wall;

[0010] An air outlet is arranged on the impact jet plate to make the airflow in the jet cavity backflow into the explosion-proof box body.

[0011] Optionally, the explosion-proof box has a second box wall opposite to the first box wall, and the turbulence devices are arranged in an array on the inner side of the second box wall.

[0012] Optionally, the explosion-proof box further comprises a ventilation shell arranged on the outer side of the first box wall, and the ventilation shell is provided with an explosion-proof fan and ventilation holes, so that a flow of air is formed in the ventilation shell to exchange with the outside.

[0013] Optionally, the explosion-proof box further has a third box wall, and the first box wall and the second box wall are connected to two ends of the third box wall, respectively, and the ventilation shell is arranged on the outer side of the first box wall, the second box wall and the third box wall, the explosion-proof fan is arranged on the ventilation shell on the outer side of the third box wall, and the ventilation holes are arranged on the ventilation shell on the outer side of the first box wall and the second box wall, so that the air flow in the ventilation shell is divided into two flows and flows through the outer side of the first box wall and the second box wall, respectively.

[0014] Optionally, the jet fan projection position and the air outlet projection position on the inner side of the first box wall are provided with a vacant area.

[0015] Optionally, the edge of the vacant area is spaced apart from the jet fan projection position and the air outlet projection position by a distance of more than twice the height of the jet cavity.

[0016] Optionally, the jet fan has a plurality of jet fans arranged in an array in the width direction of the impingement jet plate, and the air outlet is in a strip shape, parallel to the arrangement direction of the jet fans and consistent with the width of the impingement jet plate.

[0017] Optionally, one row of jet fans is arranged at each end of the impingement jet plate, and the arrangement directions of the two rows of jet fans are parallel to each other, and the air outlet is located in the middle of the impingement jet plate and faces the electrical equipment.

[0018] Optionally, the electrical equipment has a heat dissipation ventilation opening and a device heat dissipation fan, and the heat dissipation ventilation direction of the electrical equipment is the same as the direction of the air flow from the air outlet.

[0019] Optionally, the electrical equipment is connected to the explosion-proof box through a hollow support.

[0020] By adopting the above technical scheme, the present application has the following technical effects:

[0021] The heat dissipation system for the explosion-proof device provided by the application sucks the air in the explosion-proof box into the jet flow cavity through the jet flow fan, and the jet flow fan blows air towards the first wall of the box. When the strong air flow meets the first wall of the box, the wall is impacted and the air flow is forced to change direction, and finally flows towards the air outlet. The impact jet flow heat dissipation is different from the general static heat dissipation. Compared with the heat dissipation system using parallel air flow with respect to the wall and weak air flow, the parallel blowing of the weak air flow is blocked by the wall, and the closer to the wall, the weaker the air flow, in other words, the heat exchange boundary layer is thick, and the heat exchange thermal resistance is increased. The impact jet flow heat dissipation not only uses strong jet flow air flow, but also forces the jet flow to change direction by directly blowing against the wall, so as to break the blocked air flow layer near the wall, thin the heat exchange boundary layer, reduce the heat exchange thermal resistance, and finally enhance the heat exchange effect of the wall. Meanwhile, the inner wall of the first wall of the box is provided with an array of relatively low turbulence devices, which can generate turbulence vortexes and form turbulence when the strong air flow passes through, so as to increase the turbulent kinetic energy dissipation rate, thin the flow field boundary layer, and further strengthen the heat exchange effect. At the same time, the turbulence devices and the impact jet flow plate have a spacing, and the turbulence devices are relatively low, so as to reduce the pressure loss of the passing air flow and ensure sufficient heat dissipation air flow. Therefore, the system finally couples the impact jet flow cooling and the turbulence technology, not only uses high-speed flowing jet flow air, but also uses turbulence vortexes, greatly reduces the thickness of the heat exchange boundary layer in the explosion-proof device, and effectively improves the heat exchange capacity of the impact and turbulence wall. The highest thermal resistance in the explosion-proof box is the air between the electrical equipment and the explosion-proof box, so the heat dissipation by the jet flow impact and turbulence successfully transfers the heat generated by the electrical equipment to the metal explosion-proof box, and then the heat is dissipated through the high thermal conductivity of the metal, so that the surface area of the entire box can be fully utilized for heat dissipation, and the electrical equipment can work at an appropriate temperature. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 The structure schematic top view and the air flow schematic view of the embodiment of the present application;

[0024] Figure 2 The structure schematic front view and the air flow schematic view of the embodiment of the present application;

[0025] Figure 3 The impact jet flow device structure explosion schematic and the air flow schematic view of the embodiment of the present application;

[0026] Figure 4 Fig. 1 is a schematic front view of the structure of a box auxiliary heat dissipation wall according to an embodiment of the present application.

[0027] Legend of reference signs:

[0028] 1 - third wall of the box, 2 - explosion-proof fan, 3 - second wall of the box, 4 - turbulence device, 5 - ventilation hole, 6 - electrical equipment, 7 - explosion-proof box, 8 - jet fan, 9 - first wall of the box, 10 - impingement jet plate, 11 - ventilation shell, 12 - equipment heat dissipation fan, 13 - support, 14 - air outlet, 15 - jet fan projection position, 16 - air outlet projection position, 17 - empty area. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] It should be noted that in the description of the present application, the coordinate system used when describing the orientation is determined in the attitude of Figure 2 , and the viewing angle of the corresponding view is also based on this as the reference. Therefore, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like in the present specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0033] The present embodiment provides a turbulence and impingement heat dissipation system for mining equipment.

[0034] In one embodiment, as Figure 2 and3 As shown, it comprises: an explosion-proof box 7 and an impact jet device. The explosion-proof box 7 is used to contain the electrical equipment 6, in a closed structure, usually a metal box, for example, can be made of high thermal conductivity and impact resistance of Q235. The explosion-proof box 7 has a box first wall 9, on the inner side of the box first wall 9 in an array of turbulence device 4. Turbulence device 4 shape can be selected, can be for Figure 3 As shown, it comprises: an explosion-proof box 7 and an impact jet device. The explosion-proof box 7 is used to contain the electrical equipment 6, in a closed structure, usually a metal box, for example, can be made of high thermal conductivity and impact resistance of Q235. The explosion-proof box 7 has a box first wall 9, on the inner side of the box first wall 9 in an array of turbulence device 4. Turbulence device 4 shape can be selected, can be for

[0035] When using this device, the jet fan 8 and the explosion-proof fan 2 are first turned on. The jet fan 8 draws air from inside the explosion-proof enclosure 7 into the jet cavity. Because the jet fan 8 blows air towards the first wall 9 of the enclosure, when the strong airflow encounters the first wall 9, it impacts the wall and is forcibly redirected, eventually flowing towards the air outlet 14. This impact jet cooling is different from ordinary static cooling. Compared to a cooling system that uses airflow parallel to the wall with relatively weak airflow, the airflow becomes weaker closer to the wall due to the wall's obstruction of the airflow. In other words, the heat exchange boundary layer is thicker, increasing the heat exchange resistance. The jet impact cooling of this application not only uses strong jet airflow but also forces the jet to change direction by blowing directly onto the wall, thereby breaking the obstructed airflow layer near the wall. This thins the heat exchange boundary layer, reduces the heat exchange resistance, and ultimately enhances the heat exchange effect of the wall. The inner wall of the first wall 9 of the enclosure is equipped with a relatively low-profile array of turbulent devices 4. These devices generate turbulent vortices when strong airflow passes through, thereby increasing the turbulent kinetic energy dissipation rate, thinning the flow field boundary layer, and enhancing the heat transfer effect. Simultaneously, due to the gap between the turbulent devices 4 and the impact jet plate 10, the turbulent devices 4 appear relatively low, reducing pressure loss from the passing airflow and ensuring sufficient cooling airflow. Therefore, this system ultimately utilizes coupled jet impact cooling and turbulence technology, employing not only high-speed flowing jet air but also turbulent vortices to significantly reduce the thickness of the heat transfer boundary layer within the explosion-proof device, effectively improving the heat transfer capacity of the impact and turbulence walls. The area with the highest thermal resistance within the explosion-proof enclosure is the air between the electrical equipment 6 and the explosion-proof enclosure 7. Therefore, by successfully transferring the heat generated by the electrical equipment 6 to the metal explosion-proof enclosure 7 through jet impact and turbulence cooling, the high thermal conductivity of the metal allows full utilization of the entire surface area of ​​the enclosure for heat dissipation, ensuring that the electrical equipment 6 operates at a suitable temperature.

[0036] Based on the above embodiments, in a preferred embodiment, such as Figure 1 , 2 As shown in Figure 4, the explosion-proof enclosure 7 has a second wall 3 opposite to the first wall 9. Turbulence devices 4 are arranged in an array on the inner surface of the second wall 3. Since the air outlet 14 is located on the impact jet plate 10 and blows air towards the wall opposite to the first wall 9, i.e., the second wall 3, the turbulence devices 4 on the second wall 3 will cause the powerful jet blown from the air outlet 14 to change direction after passing through the wall, creating more turbulent vortices. This increases the interaction between the jet and the lateral turbulence, thereby increasing the turbulent kinetic energy dissipation rate and improving the overall system's heat dissipation efficiency. Additionally, it can improve the temperature uniformity of the second wall 3 for more efficient heat dissipation.

[0037] Based on the above embodiments, in a preferred embodiment, such as Figure 1 and 2As shown, the system also includes a ventilation shell 11. The ventilation shell 11 is arranged outside the first wall 9 of the box; the explosion-proof fan 2 and the ventilation hole 5 are arranged on the ventilation shell 11, so that the ventilation shell 11 forms a flowing air current that exchanges with the outside. The ventilation hole 5 can be in the shape of a long strip, a circle, a square, a triangle, etc.

[0038] As mining equipment, the temperature underground is usually higher than that on the ground, so sometimes it also faces the situation that the temperature underground is too high and exceeds the heat dissipation limit of the box at rest. Therefore, the device is also provided with a ventilation shell 11, which accelerates the airflow flowing on the outer surface of the first wall 9 of the box through the explosion-proof fan 2, so as to avoid excessive heat accumulation in the explosion-proof box 7 and reduce the internal jet impact and turbulence heat dissipation effect, and finally make the entire system can quickly release the heat generated by the electrical equipment 6 to the outside environment.

[0039] Based on the above implementation, in a preferred implementation, as shown in Figure 1 The explosion-proof box 7 also has a third wall 1 of the box, and the first wall 9 and the second wall 3 of the box are connected at both ends of the third wall 1 of the box. The ventilation shell 11 is arranged outside the first wall 9, the second wall 3 and the third wall 1 of the box. The explosion-proof fan 2 is arranged on the ventilation shell 11 outside the third wall 1 of the box. The ventilation shell 11 outside the first wall 9 and the second wall 3 of the box is provided with a ventilation hole 5, so that the airflow in the ventilation shell 11 is in two streams and respectively flows through the outside of the first wall 9 and the second wall 3 of the box.

[0040] Because the second wall 3 of the box is provided with a turbulence device 4, its heat dissipation capacity will be improved compared with the wall surface without the device. Therefore, arranging the ventilation shell 11 outside the first wall 9 and the second wall 3 of the box can effectively improve the heat dissipation capacity of the entire device. However, the explosion-proof fan 2 needs to add explosion-proof measures compared with the general fan, so the price is relatively high. In order to reduce the cost of the entire device, it is appropriate to reduce the amount of explosion-proof fan 2. Therefore, the ventilation shell 11 is arranged on the third wall 1 of the box connecting the first wall 9 and the second wall 3 of the box, and the explosion-proof fan 2 is arranged. In addition to being conducive to reducing the cost of the entire machine, the airflow flowing outside the third wall 1 of the box is also enhanced, thereby enhancing the heat dissipation capacity of the entire device.

[0041] Based on the above implementation, in a preferred implementation, as shown in Figure 3 and 4 The jet fan projection position 15 and the air outlet projection position 16 of the turbulence device 4 arranged in an array on the inner side of the first wall 9 of the box are provided with a vacant area 17.

[0042] The jet fan projection position 15 is the area directly receiving the impact jet, and if the turbulence device 4 is arranged at this position, turbulence will be generated during the development of the impact jet, which will interfere with the development of the impact jet and affect the heat exchange effect of the impact jet. The air outlet projection position 16 is located in the air outlet area of the impact jet device, and under the action of the strong internal air flow, strong air flow can also be sprayed from the air outlet 14, which can accelerate the air flow in the explosion-proof box 7 and enhance the heat dissipation of the electrical equipment 6. Therefore, the turbulence device 4 that generates turbulence vortex should not be arranged at the air outlet projection position 16 to affect the development of the strong air flow sprayed from the air outlet 14.

[0043] Based on the above embodiment, in a preferred embodiment, as shown in Figure 3 , the edge of the empty area 17 has a distance of more than twice the height of the jet chamber from the jet fan projection position 15 and the air outlet projection position 16, that is, the maximum outer edge of the empty area 17 is more than twice the height of the jet chamber than the actual outer boundary of the jet fan projection position 15 and the air outlet projection position 16. Because the air flow at the jet fan projection position 15 and the air outlet projection position 16 is forced to turn, a wider flat area is more conducive to the development of the strong air flow after turning and converging, avoiding the adverse effects of turbulence. After the outer edge is expanded outward by twice the height of the jet chamber, the turbulence generated by the turbulence device 4 can be reduced to a reasonable level to ensure the smooth development of the strong air flow.

[0044] Based on the above embodiment, in a preferred embodiment, as shown in Figure 3 , the jet fan 8 has multiple jet fans arranged along the width direction of the impact jet plate 10; the air outlet 14 is in the shape of a long strip, parallel to the arrangement direction of the jet fan 8, and consistent with the width of the impact jet plate 10. The arrangement of multiple jet fans 8 and corresponding long strip-shaped air outlets 14 can make the strong air flow sweep across the entire impact jet plate 10, so that the space in the jet chamber can be fully utilized for heat dissipation; especially when the impact jet plate 10 is as wide as the first wall 9 of the box, the heat dissipation capacity of the first wall 9 of the box can be greatly enhanced.

[0045] Based on the above embodiment, in a preferred embodiment, as shown in Figure 2 and 3 , one row of jet fans 8 is arranged at each end of the impact jet plate 10, and the arrangement directions of the two rows of jet fans 8 are parallel to each other; the air outlet 14 is located in the middle of the impact jet plate 10 and faces the electrical equipment 6, and can be preferably arranged as two slender air outlets 14. After such arrangement, the air flow in the explosion-proof box 7 can be divided into two air flow loops circulating upward and downward respectively, so that the heat generated by the electrical equipment 6 can be dissipated through the upper and lower walls and the left and right walls of the explosion-proof box 7, improving the heat dissipation efficiency. Figure 2 ​

[0046] Based on the above embodiment, in a preferred embodiment, as shown in Figure 2 The electrical equipment 6 has a heat dissipation vent and an equipment heat dissipation fan 12, and the heat dissipation vent direction of the electrical equipment 6 is the same as the airflow direction from the air outlet 14. Such arrangement makes the airflow blown by the air outlet 14 consistent with the airflow direction inside the electrical equipment 6, which can enhance the convection heat exchange effect inside the equipment, and make the heat inside the equipment be quickly taken out from the equipment, so as to participate in the heat dissipation airflow circulation in the explosion-proof box 7, and finally be dissipated to the outside of the explosion-proof box 7 through the impact jet and turbulence effect.

[0047] Based on the above embodiment, in a preferred embodiment, as shown in Figure 2 The electrical equipment 6 is connected with the explosion-proof box 7 through the hollow support 13. Because the airflow circulation at the lower part of the explosion-proof box 7 is an important part of the heat dissipation path, in order not to hinder the air flow, the support 13 should preferably adopt a hollow structure to reduce the disturbance to the circulating airflow.

[0048] Obviously, the above embodiments are only examples for clearly illustrating, but not limitation to the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A heat dissipation system for an explosion-proof apparatus, characterized by, The application relates to an explosion-proof box body (7) for containing an electrical device (6), which is in a closed structure and has a box body first wall (9); a plurality of turbulence devices (4) are arranged in an array on the inner side of the box body first wall (9); an impinging jet device is arranged on the inner side of the box body first wall (9); the impinging jet device comprises: an impinging jet plate (10) which is sealingly connected to the inner side of the box body first wall (9) and forms a jet cavity with the box body first wall (9); the top end of the turbulence device (4) is spaced apart from the impinging jet plate (10); a jet fan (8) is arranged on the impinging jet plate (10) and blows air towards the box body first wall (9); an air outlet (14) is arranged on the impinging jet plate (10) and enables the air flow in the jet cavity to flow back into the explosion-proof box body (7). The explosion-proof box body (7) has a box body second wall (3) opposite to the box body first wall (9), and a plurality of turbulence devices (4) are arranged in an array on the inner side of the box body second wall (3). The application further comprises a ventilation shell (11) arranged on the outer side of the box body first wall (9); the ventilation shell (11) is provided with an explosion-proof fan (2) and a ventilation hole (5), so that a flowing air current is formed in the ventilation shell (11) to exchange with the outside. The explosion-proof box body (7) further has a box body third wall (1), the box body first wall (9) and the box body second wall (3) are respectively connected to the two ends of the box body third wall (1), the ventilation shell (11) is arranged on the outer sides of the box body first wall (9), the box body second wall (3) and the box body third wall (1), the explosion-proof fan (2) is arranged on the ventilation shell (11) located on the outer side of the box body third wall (1), the ventilation shell (11) located on the outer sides of the box body first wall (9) and the box body second wall (3) is provided with the ventilation hole (5), so that the air current in the ventilation shell (11) is divided into two air currents and respectively flows through the outer sides of the box body first wall (9) and the box body second wall (3). The jet fan projection position (15) and the air outlet projection position (16) of the turbulence devices (4) arranged in an array on the inner side of the box body first wall (9) are provided with a vacant area (17). The edge of the vacant area (17) is spaced apart from the jet fan projection position (15) and the air outlet projection position (16) by a distance of more than twice the height of the jet cavity. The jet fan (8) has a plurality of jet fans (8) arranged in an array along the width direction of the impinging jet plate (10); the air outlet (14) is in a strip shape, parallel to the arrangement direction of the jet fan (8) and consistent with the width of the impinging jet plate (10).

2. The heat dissipation system for an explosion-proof apparatus according to claim 1, wherein One row of jet fans (8) is arranged at each end of the impinging jet plate (10), and the arrangement directions of the two rows of jet fans (8) are parallel to each other; the air outlet (14) is located in the middle of the impinging jet plate (10) and blows air towards the electrical device (6).

3. The heat dissipation system for an explosion-proof apparatus according to claim 1, wherein The electrical device (6) has a heat dissipation ventilation hole and a device heat dissipation fan (12), and the heat dissipation ventilation direction of the electrical device (6) is the same as the air flow direction of the air flow from the air outlet (14).

4. The heat dissipation system for an explosion-proof apparatus according to claim 3, wherein The electrical device (6) is connected to the explosion-proof box body (7) through a hollow support (13).

5. The heat dissipation system for an explosion-proof apparatus according to claim 2, wherein ​ 6. The heat dissipation system for an explosion-proof apparatus according to claim 5, wherein ​ 7. Heat dissipation system for an explosion-proof device according to any one of claims 1 to 6, characterized in that, ​ 8. The heat dissipation system for an explosion-proof apparatus according to claim 7, wherein ​ 9. The heat dissipation system for an explosion-proof apparatus according to claim 8, wherein ​ 10. The heat dissipation system for an explosion-proof apparatus according to claim 9, wherein ​

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