Explosion-proof box and power conversion device

Abstract

An explosion-proof box and a power conversion device. The explosion-proof box comprises a box body (1), a cover plate (2), a force-bearing assembly (3) and connecting members (4); the box body (1) is provided with a mounting part (10); the cover plate (2), the mounting part (10) and the force-bearing assembly (3) are successively arranged in a first direction (X) and are connected to each other by means of the connecting members (4); the orthographic projection of the force-bearing assembly (3) on the cover plate (2) in the first direction (X) covers at least some of the connecting members (4).

Description

Explosion-proof enclosure and power conversion device

[0001] This disclosure claims priority to Chinese Patent Application No. 202510203944.7, filed on February 21, 2025, entitled "Explosion-proof Box and Power Conversion Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to an explosion-proof box and a power conversion device. Background Technology

[0003] The use of electrical equipment with high environmental requirements, such as inverters, converters, and power supply units, is becoming increasingly widespread. Due to dust and moisture protection requirements, components such as capacitors, switches, and power devices in these devices must be installed inside the enclosure, posing a risk of explosion in the event of a malfunction. The covers of these electrical devices are mainly directly connected to the inverter enclosure by bolts. When the electrical equipment explodes due to thermal runaway, short circuit, or other reasons, the covers or screws can easily fly off during the explosion, causing personal injury hazards. Summary of the Invention

[0004] The following is an overview of the detailed description of this disclosure. This overview is not intended to limit the scope of the claims.

[0005] This disclosure provides an explosion-proof box, including a box body, a cover plate, a force-bearing component, and a connector. The box body is provided with a mounting position. The cover plate, the mounting position, and the force-bearing component are arranged sequentially in a first direction and connected to each other by the connector. The orthogonal projection of the force-bearing component on the cover plate along the first direction covers at least a portion of the connector.

[0006] In some embodiments of this disclosure, the force-bearing component includes a force-bearing plate, a cover plate, a mounting position, and the force-bearing plate being interconnected by connectors.

[0007] In some embodiments of this disclosure, the explosion-proof box includes a flow guide, which, together with the side wall of the box, forms a flow guide channel, which is disposed opposite to the force-bearing plate.

[0008] In some embodiments of this disclosure, the force-receiving component has a first force-receiving area and a second force-receiving area, wherein the area of ​​the first force-receiving area is larger than the area of ​​the second force-receiving area.

[0009] In some embodiments of this disclosure, the first force-bearing area includes a force-bearing plate, and the second force-bearing area includes a connecting rod extending along a second direction. One end of the connecting rod is connected to the force-bearing plate, and the second direction is perpendicular to the first direction.

[0010] In some embodiments of this disclosure, the explosion-proof box includes a limiting member disposed on the side of the mounting position facing the force-bearing component and abutting against the force-bearing component, and the orthographic projection of the limiting member on the force-bearing plate along a first direction is located on the second force-bearing area.

[0011] In some embodiments of this disclosure, there are multiple connectors, which are respectively disposed on both sides of the limiting member along the second direction, which is perpendicular to the first direction.

[0012] In some embodiments of this disclosure, the connection strength between the connector and the mounting position is less than the connection strength between the connector and the load-bearing component.

[0013] In some embodiments of this disclosure, the connector includes a plurality of first connectors and a plurality of second connectors, wherein the connection strength between the first connector and the mounting position is greater than the connection strength between the second connector and the mounting position.

[0014] In some embodiments of this disclosure, the dimension of the first connector in the first direction is larger than the dimension of the second connector in the first direction.

[0015] In some embodiments of this disclosure, a first connector passes through a force-bearing component, and a limiting portion is provided on the side of the first connector near the mounting position, the limiting portion being located on the side of the force-bearing component away from the mounting position.

[0016] In some embodiments of this disclosure, the second connector is a bolt having a first thread and a second thread; the first thread is threadedly connected to the force-bearing component, the second thread is threadedly connected to the mounting position, and the connection strength of the first thread is greater than the connection strength of the second thread.

[0017] In some embodiments of this disclosure, the force-bearing component is in contact with the sidewall of the housing.

[0018] Accordingly, this disclosure provides a power conversion device, including the explosion-proof box described above, wherein multiple electronic devices are disposed inside the explosion-proof box.

[0019] In one embodiment of the present disclosure, the connector is configured such that when the impact force on the force-bearing component exceeds a threshold, the force-bearing component can drive at least a portion of the connector to move relative to the mounting position, thereby moving the cover plate and forming a pressure relief channel between the cover plate and the mounting position to reduce the pressure generated by the explosion. This reduces the possibility of the cover plate or connector flying out when an explosion occurs inside the explosion-proof box, ensuring the safety of surrounding equipment and personnel.

[0020] The power conversion device of this disclosure includes the explosion-proof box described above. Therefore, the power conversion device can have all the technical features and beneficial effects of the explosion-proof box described above, which will not be repeated here.

[0021] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is an exploded view of an explosion-proof box according to an embodiment of this disclosure;

[0024] Figure 2 is a structural schematic diagram of an explosion-proof box according to an embodiment of the present disclosure;

[0025] Figure 3 is an enlarged view of part A in Figure 2;

[0026] Figure 4 is a structural schematic diagram of a first type of force-bearing component according to an embodiment of this disclosure;

[0027] Figure 5 is a structural schematic diagram of a second type of force-bearing component according to an embodiment of this disclosure;

[0028] Figure 6 is a structural schematic diagram of a third type of force-bearing component according to an embodiment of this disclosure;

[0029] Figure 7 is a structural schematic diagram of the fourth type of force-bearing component according to an embodiment of this disclosure;

[0030] Figure 8 is a cross-sectional view of an explosion-proof box in a closed state according to an embodiment of the present disclosure;

[0031] Figure 9 is an enlarged view of part B in Figure 8;

[0032] Figure 10 is an enlarged view of part C in Figure 8;

[0033] Figure 11 is an enlarged view of part D in Figure 8;

[0034] Figure 12 is a partial cross-sectional view of an explosion-proof box according to an embodiment of the present disclosure;

[0035] Figure 13 is a cross-sectional view of an explosion-proof box in an open state according to an embodiment of the present disclosure;

[0036] Figure 14 is a structural schematic diagram of a second connector according to an embodiment of the present disclosure;

[0037] Figure 15 is a structural schematic diagram of a first connector according to an embodiment of the present disclosure;

[0038] Figure 16 is a schematic diagram of a first type of explosion-proof box according to an embodiment of this disclosure;

[0039] Figure 17 is a schematic diagram of a second type of explosion-proof box according to an embodiment of this disclosure;

[0040] Figure 18 is a schematic diagram of a third type of explosion-proof box according to an embodiment of this disclosure.

[0041] Brief description of the attached diagram:

[0042] 1. Housing; 2. Cover plate; 3. Load-bearing component; 4. Connector; 5. Limiting component; 6. Flow guide; 7. Flow guide channel; 8. Electronic components; 10. Mounting position; 30. Load-bearing plate; 31. Load-bearing surface; 32. Connecting rod; 33. Threaded hole; 40. First connector; 41. Second connector; 310. First load-bearing area; 311. Second load-bearing area; 320. First end; 321. Second end; 400. Limiting part; 410. Bolt; 4100. First thread; 4101. Second thread; X, First direction; Y, Second direction. Embodiments of the present invention

[0043] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0044] In the description of this disclosure, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this disclosure, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0045] Currently, electrical equipment with high environmental requirements, such as inverters, converters, and power supply units, are being used more and more widely. Due to dust and moisture protection requirements, components such as capacitors, switches, and power devices in these devices need to be installed inside the enclosure, posing a risk of explosion in the event of a malfunction. Currently, the covers of these electrical devices are mainly connected directly to the inverter enclosure with bolts. When the electrical equipment explodes due to thermal runaway, short circuits, or other reasons, the covers or screws can easily fly off during the explosion, causing personal injury hazards.

[0046] In view of this, this disclosure provides an explosion-proof enclosure, including an enclosure body, a cover plate, a load-bearing component, and a connector. The enclosure body is provided with a mounting position. The cover plate, the mounting position, and the load-bearing component are arranged sequentially in a first direction and connected to each other via the connector. The orthographic projection of the load-bearing component onto the cover plate along the first direction covers at least a portion of the connector. The connector is configured such that, when the impact force on the load-bearing component exceeds a threshold, the load-bearing component can drive at least a portion of the connector to move relative to the mounting position, thereby moving the cover plate. This creates a pressure relief channel between the cover plate and the mounting position, achieving local pressure relief to reduce the pressure generated by an explosion. This configuration reduces the possibility of the cover plate or connector being ejected during an explosion inside the explosion-proof enclosure, ensuring the safety of surrounding equipment and personnel.

[0047] The electronic devices disclosed herein include, but are not limited to, inverters, motor controllers, converters, power supply devices, etc.

[0048] The explosion-proof enclosure and power conversion device of this disclosure will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0049] Referring to Figure 1, this embodiment of the present disclosure provides an explosion-proof box, including a box body 1, a cover plate 2, a load-bearing component 3, and a connector 4. The box body 1 is provided with a mounting position 10, which can be a folded edge extending inward from the box body 1 or a partial protrusion extending inward from the box body, ensuring that the connector 4 has sufficient installation space to connect the cover plate 2 and the load-bearing component 3. The cover plate 2, the mounting position 10, and the load-bearing component 3 are arranged sequentially in a first direction X and are interconnected by the connector 4. The box body 1 has an opening, and the cover plate 2 is located on the side of the box body 1 away from the load-bearing component 3, sealing the opening. The load-bearing component 3 is located on the side of the box body 1 away from the cover plate 2 and is connected to the box body 1 via the connector 4. The connector 4 includes, but is not limited to, screws, pins, and fasteners. The load-bearing component 3 and the connector 4 can be directly connected by screws, fasteners, or pins, or the connector 4 can directly abut against the load-bearing component 3, achieving the aforementioned functions.

[0050] The force-bearing component 3, projected along the first direction X onto the cover plate 2, covers at least a portion of the connecting member 4. Referring again to Figure 1, a portion of the connecting member 4 is connected to the force-bearing component 3, which has a certain area capable of covering at least two connecting members 4 connected to the enclosure 1. The force-bearing component 3 can be a flat plate of a certain area, multiple plates of a certain width, or a curved shell of a certain area. When the force-bearing component 3 is subjected to the impact force generated by an explosion within the enclosure 1, or when the impact force exceeds a threshold, the force-bearing surface of the force-bearing component 3, under the impact pressure, can drive at least a portion of the connecting member 4 to move relative to the mounting position 10, thereby moving the cover plate 2. This creates a pressure relief channel between the cover plate 2 and the mounting position 10, achieving local pressure relief to reduce the pressure generated by the explosion. This pressure relief channel, thus configured, releases internal pressure, reducing the possibility of the cover plate 2 or connecting member 4 being ejected when electronic components 8 inside the explosion-proof enclosure explode, ensuring the safety of surrounding equipment and personnel.

[0051] In the embodiment shown in Figure 2, the force-bearing component 3 has a first force-bearing area 310 and a second force-bearing area 311, with the area of ​​the first force-bearing area 310 being larger than the area of ​​the second force-bearing area 311. The first force-bearing area 310 and the second force-bearing area 311 form a force-bearing surface 31, which is located on the side of the force-bearing component 3 facing away from the mounting position 10. The force-bearing surface 31 can be positioned opposite to the electronic device 8 inside the explosion-proof enclosure, as shown in Figures 4 to 7. According to the principle that force = pressure × area, assuming that the explosion pressure generated by the explosion inside the enclosure 1 is uniform, since the area of ​​the first force-bearing area 310 is larger than the area of ​​the second force-bearing area 311, the outward explosive thrust received by the first force-bearing area 310 is much greater than the explosive thrust received by the second force-bearing area 311. Therefore, when the first stress zone 310 receives an impact force or the impact force exceeds a threshold, at least a portion of the connecting member 4 covered by the first stress zone 310 can move relative to the mounting position 10 to move the cover plate 2, thereby forming a pressure relief channel between the cover plate 2 and the mounting position 10. This pressure relief channel enables localized pressure relief to reduce the pressure generated by the explosion. Meanwhile, the second stress zone 311, due to the smaller outward explosive thrust, ensures the connection between the cover plate 2 and the mounting position 10, preventing the cover plate 2 from being ejected in the event of an explosion of electronic components inside the explosion-proof enclosure, thus protecting the safety of surrounding equipment and personnel.

[0052] In the embodiment shown in Figure 4, the first stress zone 310 includes a stress plate 30, and the second stress zone 311 includes a connecting rod 32. The connecting rod 32 extends along a second direction Y, and one end of the connecting rod 32 is connected to the stress plate 30. The second direction Y is perpendicular to the first direction X. At least a portion of the connecting member 4 is connected to the connecting rod 32, and the remaining portion of the connecting member 4 is connected to the stress plate 30. When the stress plate 30 is subjected to an impact force or the impact force exceeds a threshold, the outward pushing force on the stress plate 30 causes the connecting member 4 and the cover plate 2 to move relative to the mounting position 10, thereby forming a pressure relief channel between the cover plate 2 and the mounting position 10. The pressure relief channel achieves local pressure relief to reduce the pressure generated by the explosion. Since the connecting rod 32 is subjected to a smaller outward explosive pushing force, it can ensure the connection between the cover plate 2 and the mounting position 10, which can reduce the possibility of the cover plate 2 flying out when the electronic components 8 in the explosion-proof box explodes, thus ensuring the safety of surrounding equipment and personnel. Meanwhile, a connecting rod 32 is set in the first force zone 310 and connected to the connector 4. Under the action of the thrust generated in the second force zone 311, the first force zone 310 generates a reverse thrust that moves into the box 1, which strengthens the connection force of the connector 4.

[0053] In the embodiment shown in Figure 5, the first stress-bearing area 310 includes a stress-bearing plate 30, and the second stress-bearing area 311 includes a connecting rod 32. The connecting rod 32 extends along the second direction Y, and one end of the connecting rod 32 is connected to the stress-bearing plate 30. Multiple connecting rods 32 are spaced apart and connected to each other via the connecting rods 32 and the stress-bearing plate 30. This configuration increases the area of ​​the second stress-bearing area 311, allowing it to contact and withstand the explosive impact over a wider range. This reduces the risk of damage or failure of the connecting rod 32 due to excessive local stress, ensuring the stability and reliability of the connecting rod 32 under explosive impact.

[0054] In the embodiment shown in Figure 6, the first stress zone 310 includes a stress plate 30, and the second stress zone 311 includes a connecting rod 32. The connecting rod 32 extends along the second direction Y, and one end of the connecting rod 32 is connected to the stress plate 30. Multiple connecting rods 32 are spaced apart and connected to the stress plate 30 through the connecting rods 32. The stress plate 30 is provided with a notch, which ensures that the stress plate 30 can drive the connecting member 4 and the cover plate 2 to move relative to the mounting position 10 when subjected to an outward pushing force, so as to form a pressure relief channel between the cover plate 2 and the mounting position 10. While achieving local pressure relief through the pressure relief channel, the area of ​​the first stress zone 310 is reduced, thereby reducing the overall weight of the stress component 3 and reducing costs.

[0055] In the embodiment shown in Figure 7, the force-bearing component 3 is provided with multiple through holes to form a second force-bearing area 311, and the area without through holes forms a first force-bearing area 310. This arrangement increases the area of ​​the second force-bearing area 311, allowing the impact force to be more evenly distributed across the entire force-bearing component 3. Through the dispersing effect of the second force-bearing area 311, the risk of excessive localized stress is reduced, ensuring the stability and reliability of the force-bearing component 3 under explosive impact.

[0056] In the implementations shown in Figures 5 to 7 above, the area of ​​the first stress zone 310 is larger than the area of ​​the second stress zone 311. The first stress zone 310 can be a complete stress plate 30 or a hollow stress plate 30. The second stress zone 311 can be a rod or a hollow stress plate 30. As long as the area of ​​the first stress zone 310 is larger than the area of ​​the second stress zone 311, the specific implementation method is not limited.

[0057] In the embodiment shown in Figure 3, the explosion-proof enclosure includes a limiting member 5. The limiting member 5 is disposed on the side of the mounting position 10 facing the force-bearing component 3 and abuts against the force-bearing component 3. The orthographic projection of the limiting member 5 along the first direction X on the force-bearing surface 31 is located on the second force-bearing area 311, and can abut against the connecting rod of the second force-bearing area. The limiting member 5 is configured to abut against the force-bearing component 3 when the impact force received by the force-bearing component 3 exceeds a threshold, causing the force-bearing component 3 to rotate around the limiting member 5. When the impact force received by the force-bearing component 3 exceeds the threshold, the design of the limiting member 5 plays a role in restricting and guiding the movement of the force-bearing component 3 in the explosion-proof enclosure. For example, the limiting member 5 acts as a fulcrum, and the force-bearing component 3 acts as a lever against the limiting member 5. Under the thrust generated by the explosion, the first force-bearing area of ​​the force-bearing component 3 rotates around the limiting member 5, thereby enabling at least a portion of the cover plate 2 to move relative to the mounting position 10 to form a pressure relief channel between the cover plate 2 and the mounting position 10. The remaining portion of the cover plate 2 moves toward the mounting position 10 to achieve locking between the cover plate 2 and the mounting position 10. That is, the second force-bearing area receives the opposite thrust to the first force-bearing area, thereby reducing the pressure generated by the explosion, reducing the amount of the cover plate 2 flying out, ensuring personal safety, and enhancing the safety performance of the explosion-proof box.

[0058] In the embodiment shown in Figure 8, there are multiple connectors 4, which are respectively disposed on both sides of the limiting member 5 along the second direction Y, which is perpendicular to the first direction X. With this configuration, the limiting member 5 acts as a fulcrum, and the force-bearing component 3 acts as a lever against the limiting member 5. The connector 4 disposed on one side of the limiting member 5 along the second direction Y can cause the force-bearing component 3 to rotate around the limiting member 5 under the thrust generated by the explosion, thereby allowing at least a portion of the cover plate 2 to move relative to the mounting position 10 to form a pressure relief channel between the cover plate 2 and the mounting position 10. The connector 4 disposed on the other side of the limiting member 5 along the second direction Y can also cause the force-bearing component 3 to rotate around the limiting member 5 under the thrust generated by the explosion, thereby allowing a portion of the cover plate 2 to move towards the mounting position 10 to achieve locking between the cover plate 2 and the mounting position 10. This reduces the pressure generated by the explosion, minimizes the ejection of the cover plate 2, ensures personal safety, and enhances the safety performance of the explosion-proof box.

[0059] In the embodiments shown in Figures 9 and 10, the force-bearing component 3 includes a plurality of connecting rods 32 and a force-bearing plate 30 connecting the plurality of connecting rods 32. A plurality of connecting members 4 are disposed on the connecting rods 32 and the force-bearing plate 30 along a second direction Y, where the second direction Y is the extending direction of the connecting rods 32.

[0060] In the embodiment shown in Figure 13, the limiting member 5 acts as a fulcrum, and the connecting rod 32 acts as a lever abutting against the limiting member 5. When the impact force on the force plate 30 exceeds a threshold, it drives the connecting rod 32 to rotate around the limiting member 5, thereby enabling at least a portion of the cover plate 2 opposite to the force plate 30 to move relative to the housing 1 to form a pressure relief channel between the cover plate 2 and the mounting position 10. Since the outward explosive thrust on the connecting rod 32 is relatively small, it can rotate around the limiting member 5, driving a portion of the cover plate 2 towards the mounting position 10 to achieve locking between the cover plate 2 and the mounting position 10. This reduces the pressure generated by the explosion, minimizes the ejection of the cover plate 2, ensures personal safety, and enhances the safety performance of the explosion-proof housing.

[0061] In some embodiments, the connector 4 includes a plurality of first connectors 40 and a plurality of second connectors 41, wherein the connection strength between the first connectors 40 and the mounting position 10 is greater than the connection strength between the second connectors 41 and the mounting position 10. As shown in Figures 9 and 11, the plurality of first connectors 40 are arranged at intervals and connect the cover plate 2, the housing 1, and the connecting rod 32; as shown in Figure 10, the plurality of second connectors 41 are arranged at intervals and connect the cover plate 2, the housing 1, and the force-bearing plate 30. When the impact force on the force-bearing component 3 exceeds a threshold, the second connectors 41 move relative to the mounting position 10 to move the cover plate 2 away from the housing, thereby forming a pressure relief channel between the cover plate 2 and the mounting position 10. When the impact force on the force-bearing component 3 exceeds a threshold, the first connectors 40 are subjected to a directional thrust and move relative to the mounting position 10 toward the housing, thereby locking the cover plate 2 and the mounting position 10. By setting the connection strength between the first connector 40 and the mounting position 10 to be greater than the connection strength between the second connector 41 and the mounting position 10, the second connector 41 can more easily loosen from the limitation of the mounting position 10 under impact force and move. The strength of the first connector and the locking force of the cover plate are also greater.

[0062] The first connector 40 and the second connector 41 of this disclosure embodiment can be designed differently. For example, in some embodiments, the first connector 40 can be connected to the connecting rod 32 and the housing 1 by a high-strength threaded connection, the second connector 41 can be connected to the force-bearing plate 30 by a high-strength threaded connection, and the second connector 41 can be connected to the housing 1 by a low-strength threaded connection. In other embodiments, the first connector 40 and the second connector 41 can be made of different materials to ensure that the strength of the first connector 40 is greater than that of the second connector 41. Furthermore, the greater connection strength between the first connector 40 and the mounting position than the greater connection strength between the second connector 41 and the mounting position can also be understood as the connection between the first connector and the mounting position being an interference fit, achieving a greater connection strength than the second connector and the mounting position. Alternatively, the mounting hole of the second connector connecting to the mounting position can be set to be larger, allowing the second connector to more easily escape the limitation of the mounting position, thus achieving a lesser connection strength between the second connector and the mounting position than the connection strength between the first connector 40 and the mounting position. The above are all embodiments and do not limit the specific implementation method.

[0063] In the embodiment shown in Figure 14, the second connector 41 is a bolt 410, which has a first thread 4100 and a second thread 4101. The bolt 410 is threadedly connected to the threaded hole 33 on the load-bearing plate 30 through the first thread 4100, and to the housing 1 through the second thread 4101, as shown in Figure 10. This configuration ensures that the threaded connection between the first thread 4100 and the load-bearing plate 30 is firm and reliable, thereby being able to withstand the impact force during an explosion. Simultaneously, the threaded connection between the second thread 4101 and the housing 1 should be designed to fail when the load-bearing component 3 is subjected to an impact force exceeding a threshold, causing the bolt 410 to move relative to the housing 1. For example, the bolt 410 is configured such that when the impact force on the load-bearing component 3 exceeds a threshold, the connection between the second thread 4101 and the housing 1 fails, causing the bolt 410 to move relative to the housing 1. This allows the load-bearing plate 30 and the cover plate 2, connected to the second connector 41, to move relative to the housing 1 to open the mounting position 10, thereby reducing the pressure generated by the explosion. For example, materials of different strengths can be selected or processes such as heat treatment can be used to achieve a strength greater than that of the second thread 4101. Alternatively, the strength of the first thread 4100 can be greater than that of the second thread 4101 by differentiating the size and shape of the first thread 4100 and the second thread 4101. For example, the diameter or depth of the first thread 4100 can be increased, or a tighter thread shape can be used to increase the strength of the first thread 4100, which is not limited in this disclosure.

[0064] In the embodiment shown in Figure 15, the first connector 40 is a bolt 410, which has a first thread 4100. The first thread 4100 can be a high-strength thread, thereby ensuring a firm and reliable threaded connection between the first thread 4100 and the load-bearing plate 30, the housing 1, and the cover plate 2. Exemplarily, the strength of the first thread 4100 can be improved through processes such as heat treatment. Alternatively, the strength of the first thread 4100 can be increased by increasing its diameter or depth, or by using a tighter thread shape; this disclosure does not limit this to any particular method.

[0065] In other embodiments, the connector 4 includes a plurality of first connectors 40 and a plurality of second connectors 41, wherein the connection strength between the first connectors 40 and the mounting position 10 is greater than the connection strength between the second connectors 41 and the mounting position 10. In embodiments of this disclosure, the first connectors 40 and the second connectors 41 have the same specifications. By differentiating the design of the mounting holes on the mounting position 10, it can be ensured that when the impact force received by the force-bearing component 3 exceeds a threshold, the connection between the second connector 41 and the mounting position 10 fails, while the connection between the first connector 40 and the mounting position 10 remains stable. For example, mounting holes of different depths are provided for different connectors 4. For the second connector 41 that needs to fail, the size of its mounting hole in the first direction X is smaller; for the first connector 40 that needs a stable connection, the size of its mounting hole in the first direction X is larger. Alternatively, for the second connector 41 that needs to fail, the inner surface of its mounting hole is relatively smooth; for the first connector 40 that needs a stable connection, the inner surface of its mounting hole is relatively rough. Alternatively, for the second connector 41 that needs to fail, the diameter of its mounting hole is larger. For the first connector 40 that requires a stable connection, the diameter of its mounting hole is designed to match or be slightly smaller than the size of the connector 4.

[0066] In the embodiment shown in Figure 12, the dimension of the first connector 40 in the first direction X is larger than that of the second connector 41 in the first direction X. The first connector 40 passes through the force-bearing component 3, and a limiting part 400 is provided on the side of the first connector 40 near the mounting position 10. The limiting part 400 is located on the side of the force-bearing component 3 away from the mounting position 10. The force-bearing component 3 includes a plurality of connecting rods 32 and a force-bearing plate 30 connecting the plurality of connecting rods 32. The first connector passes through the second end 321 of the connecting rod 32. It can be understood that when the force-bearing plate 30 is subjected to an outward explosive thrust, the explosive thrust causes the cover plate 2 connected to the force-bearing plate 30 to move relative to the housing 1 to form a pressure relief channel between the cover plate 2 and the mounting position 10. At the same time, through the setting of the limiting part 5, the first end 320 of the connecting rod 32 will rotate around the limiting part 5, thereby converting the outward thrust of the force-bearing plate 30 into an inward locking force of the second end 321. By increasing the dimension of the first connecting member 40 in the first direction X, the second end 321 of the connecting rod 32 can move the cover plate 2 towards the side closer to the mounting position 10, thereby achieving a locking between the cover plate 2 and the mounting position 10. This ensures that the cover plate 2 will not loosen or detach under explosion pressure, thus enhancing the safety performance of the explosion-proof box. The design of the limiting part 400 can prevent the second end 321 of the connecting rod 32 from moving the cover plate 2 away from the mounting position 10 under certain operating conditions, preventing the cover plate 2 from detaching under explosion pressure, thereby ensuring the safety of surrounding equipment and personnel.

[0067] In other embodiments, the cover plate 2 is provided with a mounting groove for the connector 4. A corrugated element with stretchability is provided within the mounting groove of the first connector 40 to accommodate relative displacement between the cover plate, the first connector 40, and the mounting groove caused by an explosion impact, allowing the first connector 40 to displace along a first direction X. This enables the second end 321 connected to the first connector 40 to move the cover plate 2 towards the side closer to the mounting position 10, thereby achieving a locking between the cover plate 2 and the mounting position 10. This prevents the cover plate 2 from loosening or detaching under explosion pressure, thus enhancing the safety performance of the explosion-proof enclosure.

[0068] In some embodiments, the force-bearing component 3 does not require a connecting rod 32; only a force-bearing plate 30 is needed. The cover plate 2, the mounting position 10, and the force-bearing plate 30 are interconnected via a connector 4. The force-bearing plate 30 is positioned along the explosion gas path of the electronic device 14. In the embodiment shown in FIG. 16, the electronic device 14 inside the housing 1 is positioned corresponding to the force-bearing plate 30 in the first direction X. If the electronic device 14 explodes, the impact force generated by the explosion can cause the force-bearing plate 30 and the cover plate 2 connected to the force-bearing plate 30 to move away from the mounting position 10. This creates a pressure relief channel between the cover plate 2 and the mounting position 10, thereby achieving local pressure relief and reducing the pressure generated by the explosion.

[0069] In the embodiment shown in Figure 17, the explosion-proof box includes a flow guide 6, which, together with the side wall of the box body 1, forms a flow guide channel 7. The flow guide channel 7 is disposed opposite to the force-bearing surface 31. If the electronic device 14 inside the box body 1 is misaligned with the force-bearing plate 30 in the first direction X, the flow guide 6 can guide the high-temperature and high-pressure gas generated during the explosion through the flow guide channel 7 to the force-bearing surface 31 of the force-bearing plate 30. This causes the force-bearing plate 30 and the cover plate 2 connected to the force-bearing plate 30 to move away from the mounting position 10, thereby forming a pressure relief channel between the cover plate 2 and the mounting position 10. This pressure relief channel enables local pressure relief to reduce the pressure generated by the explosion.

[0070] In the embodiment shown in Figure 18, there are multiple flow guides 6, which together form a flow guide channel 7. The flow guide channel 7 is positioned opposite to the force-bearing surface 31 to guide the high-temperature, high-pressure gas generated during the explosion to the force-bearing surface 31 of the force-bearing plate 30. This arrangement ensures that the electronic components 8 inside the explosion-proof enclosure can function normally for pressure relief and explosion protection under different layout conditions.

[0071] In some embodiments, the force-bearing component 3 contacts the side wall of the enclosure 1. The force-bearing component 3 is made of a high thermal conductivity material such as metal or ceramic. The contact between the force-bearing component 3 and the side wall of the enclosure 1 can transfer the heat inside the explosion-proof enclosure to the external environment through the force-bearing component 3, the connector 4, and the cover plate 2, thereby playing a heat dissipation role, reducing the temperature inside the explosion-proof enclosure, preventing problems caused by overheating, and thus improving the safety and reliability of the explosion-proof enclosure.

[0072] Accordingly, this disclosure provides a power conversion device, including the aforementioned explosion-proof enclosure; the enclosure 1 houses a plurality of electronic devices 8. Therefore, this power conversion device can possess all the technical features and beneficial effects of the aforementioned explosion-proof enclosure, which will not be elaborated further here.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] The explosion-proof box and power conversion device provided in the embodiments of this disclosure have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this disclosure. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this disclosure. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. An explosion-proof box, comprising a box body, a cover plate, a load-bearing component, and a connector, wherein the box body is provided with a mounting position; the cover plate, the mounting position, and the load-bearing component are arranged sequentially in a first direction and connected to each other through the connector; the orthographic projection of the load-bearing component on the cover plate along the first direction covers at least a portion of the connector.

2. The explosion-proof box according to claim 1, wherein, The force-bearing component includes a force-bearing plate, and the cover plate, the mounting position, and the force-bearing plate are interconnected via the connector.

3. The explosion-proof box according to claim 2, wherein, The explosion-proof box includes a flow guide, which forms a flow guide channel with the side wall of the box body, and the flow guide channel is disposed opposite to the force-bearing plate.

4. The explosion-proof box according to claim 1, wherein, The force-receiving component has a first force-receiving area and a second force-receiving area, wherein the area of ​​the first force-receiving area is larger than the area of ​​the second force-receiving area.

5. The explosion-proof box according to claim 4, wherein, The first stress-bearing area includes a stress-bearing plate, and the second stress-bearing area includes a connecting rod. The connecting rod extends along a second direction, and one end of the connecting rod is connected to the stress-bearing plate. The second direction is perpendicular to the first direction.

6. The explosion-proof box according to claim 4 or 5, wherein, The explosion-proof box includes a limiting member, which is disposed on the side of the mounting position facing the force-bearing component and abuts against the force-bearing component. The orthographic projection of the limiting member on the force-bearing component along the first direction is located on the second force-bearing area.

7. The explosion-proof box according to claim 6, wherein, The number of connectors is multiple, and the multiple connectors are respectively disposed on both sides of the limiting member along the second direction, the second direction being perpendicular to the first direction.

8. The explosion-proof box according to any one of claims 1 to 7, wherein, The connection strength between the connector and the mounting position is less than the connection strength between the connector and the load-bearing component.

9. The explosion-proof box according to any one of claims 1 to 7, wherein, The connector includes a plurality of first connectors and a plurality of second connectors, wherein the connection strength between the first connector and the mounting position is greater than the connection strength between the second connector and the mounting position.

10. The explosion-proof box according to claim 9, wherein, The dimension of the first connector in the first direction is greater than the dimension of the second connector in the first direction.

11. The explosion-proof box according to claim 10, wherein, The first connector passes through the force-bearing component, and a limiting part is provided on the side of the first connector near the mounting position, the limiting part being located on the side of the force-bearing component away from the mounting position.

12. The explosion-proof box according to claim 9, wherein, The second connector is a bolt, which has a first thread and a second thread; the first thread is threadedly connected to the force-bearing component, the second thread is threadedly connected to the mounting position, and the connection strength of the first thread is greater than the connection strength of the second thread.

13. The explosion-proof box according to claim 1, wherein, The force-bearing component is in contact with the side wall of the housing.

14. A power conversion device, wherein, Includes the explosion-proof box as described in any one of claims 1 to 13; The explosion-proof box contains multiple electronic components.

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