Explosion-proof box and power conversion device

Abstract

The invention discloses an explosion-proof box and a power conversion device, and belongs to the technical field of explosion prevention, the explosion-proof box comprises a box body, a cover plate, a stress assembly and a connecting piece, the box body is provided with a mounting position, and the cover plate, the mounting position and the stress assembly are sequentially arranged in a first direction and are mutually connected through the connecting piece; the orthographic projection of the stress assembly on the cover plate in the first direction covers at least part of the connecting piece. The connecting pieces are configured to enable the stress assembly to drive at least part of the connecting pieces to move relative to the mounting position to drive the cover plate to move under the condition that impact force borne by the stress assembly exceeds a threshold value, so that a pressure relief channel can be formed between the cover plate and the mounting position to relieve pressure generated by explosion, and the explosion safety is improved. Therefore, the possibility that the cover plate or the connecting piece flies out when exploding in the explosion-proof box can be reduced, and the safety of peripheral equipment and personnel is guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of explosion protection, and particularly relates to an explosion-proof box and a power conversion device. Background Art

[0002] Currently, some electrical equipment with high environmental requirements, such as inverters, converters, or power supply devices, are being used more and more widely. Due to the requirements of dust and moisture protection, components such as capacitors, switches, and power devices need to be installed inside the chassis. There is a risk of explosion when the equipment fails. Currently, the cover of the electrical equipment is mainly directly connected to the inverter box body through bolts. When the electrical equipment explodes due to thermal runaway, short circuit, or other reasons, the cover or screws are likely to fly out during the explosion, causing harm to personal safety. Summary of the Invention

[0003] Object of the Invention: The embodiments of this application provide an explosion-proof box and a power conversion device, aiming to reduce the possibility of the cover or screws flying out when the electrical equipment explodes, and ensure the safety of surrounding equipment and personnel.

[0004] Technical Solution: The embodiments of this application provide an explosion-proof box, including a box body, a cover, a stress component, and a connecting member. The box body is provided with an installation position. The cover, the installation position, and the stress component are arranged in sequence in a first direction and are connected to each other through the connecting member; the projection of the stress component on the cover in the first direction covers at least part of the connecting member.

[0005] In some embodiments, the stress component includes a stress plate, and the cover, the installation position, and the stress plate are connected to each other through the connecting member.

[0006] In some embodiments, the explosion-proof box includes a diversion member. The diversion member and the side wall of the box body enclose a diversion channel, and the diversion channel is arranged opposite to the stress plate.

[0007] In some embodiments, the stress component has a first stress area and a second stress area, and the area of the first stress area is larger than that of the second stress area.

[0008] In some embodiments, the first stress area includes a stress plate, and the second stress area includes a connecting rod. The connecting rod extends in a second direction, and one end of the connecting rod is connected to the stress plate. The second direction is perpendicular to the first direction.

[0009] In some embodiments, the explosion-proof box includes a limiting member. The limiting member is arranged on the side of the installation position facing the stress component and abuts against the stress component. The projection of the limiting member on the stress plate in the first direction is located on the second stress area.

[0010] In some embodiments, the number of connecting members is multiple, and the multiple connecting members are respectively arranged on both sides of the limiting member in the second direction. The second direction is perpendicular to the first direction.

[0011] In some embodiments, the connection strength between the connecting member and the mounting position is less than the connection strength between the connecting member and the force-bearing component.

[0012] In some embodiments, the connecting member includes a plurality of first connecting members and a plurality of second connecting members, and the connection strength between the first connecting member and the mounting position is greater than the connection strength between the second connecting member and the mounting position.

[0013] In some embodiments, the dimension of the first connecting member in the first direction is greater than the dimension of the second connecting member in the first direction.

[0014] In some embodiments, the first connecting member passes through the force-bearing component, and a limiting portion is provided on a side of the first connecting member close to the mounting position, and the limiting portion is located on a side of the force-bearing component away from the mounting position.

[0015] In some embodiments, the force-bearing component contacts the side wall of the box body.

[0016] Correspondingly, an embodiment of the present application provides a power conversion device, including the above-mentioned explosion-proof box, and a plurality of electronic devices are arranged in the box body of the explosion-proof box.

[0017] Beneficial effects: An explosion-proof box according to an embodiment of the present application includes a box body, a cover plate, a force-bearing component, and a connecting member. The box body is provided with a mounting position. The cover plate, the mounting position, and the force-bearing component are arranged in sequence in the first direction and are connected to each other through the connecting member. The force-bearing component covers at least a part of the connecting member in the positive projection on the cover plate along the first direction. The connecting member is configured to enable the force-bearing component to drive at least a part of the connecting member to move relative to the mounting position to drive the cover plate to move when the impact force received by the force-bearing component exceeds a threshold value, so as to form a pressure relief channel between the cover plate and the mounting position to reduce the pressure generated by the explosion, thereby reducing the possibility of the cover plate or the connecting member flying out when an explosion occurs in the explosion-proof box, and ensuring the safety of surrounding equipment and personnel.

[0018] The power conversion device according to the embodiment of the present application includes the above-mentioned explosion-proof box. Therefore, the power conversion device can have all the technical features and beneficial effects of the above-mentioned explosion-proof box, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is an exploded view of an explosion-proof box according to an embodiment of the present application;

[0021] Figure 2 It is a schematic structural diagram of an explosion-proof box according to an embodiment of the present application;

[0022] Figure 3 It is Figure 2 an enlarged view of part A of

[0023] Figure 4 It is a schematic structural diagram of the first force-bearing component according to an embodiment of the present application;

[0024] Figure 5 It is a schematic structural diagram of the second force-bearing component according to an embodiment of the present application;

[0025] Figure 6 It is a schematic structural diagram of the third force-bearing component according to an embodiment of the present application;

[0026] Figure 7 It is a schematic structural diagram of the fourth force-bearing component according to an embodiment of the present application;

[0027] Figure 8 It is a cross-sectional view of an explosion-proof box in a closed state according to an embodiment of the present application;

[0028] Figure 9 It is Figure 8 an enlarged view of part B of

[0029] Figure 10 It is Figure 8 an enlarged view of part C of

[0030] Figure 11 It is Figure 8 an enlarged view of part D of

[0031] Figure 12 It is a partial cross-sectional view of an explosion-proof box according to an embodiment of the present application;

[0032] Figure 13 It is a cross-sectional view of an explosion-proof box in an open state according to an embodiment of the present application;

[0033] Figure 14 It is a schematic structural diagram of a second connecting member according to an embodiment of the present application;

[0034] Figure 15 It is a schematic structural diagram of a first connecting member according to an embodiment of the present application;

[0035] Figure 16 It is a schematic diagram of the first explosion-proof box according to an embodiment of the present application;

[0036] Figure 17 It is a schematic diagram of the second explosion-proof box according to an embodiment of the present application;

[0037] Figure 18 It is a schematic diagram of the third explosion-proof box according to an embodiment of the present application.

[0038] Explanation of the accompanying drawings: 1. Box body; 2. Cover plate; 3. Force-bearing component; 4. Connecting member; 5. Limiting member; 6. Guide member; 7. Guide channel; 8. Electronic device; 10. Mounting position; 30. Force-bearing plate; 31. Force-bearing surface; 32. Connecting rod; 33. Threaded hole; 40. First connecting member; 41. Second connecting member; 310. First force-bearing area; 311. Second force-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. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "plurality" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0041] At present, some electrical equipment with high environmental requirements, such as inverters, converters or power supply devices, are increasingly being used. Due to the need for dust and moisture resistance, capacitors, switches, power devices and other components of such electrical equipment need to be installed inside the chassis, which poses a risk of explosion when the equipment fails. At present, the cover of electrical equipment is mainly connected directly to the inverter box by bolts. When the electrical equipment explodes due to thermal runaway, short circuit or other reasons, the cover or screws are easy to fly out during the explosion, causing personal safety hazards.

[0042] In view of this, an explosion-proof box provided by an embodiment of the present application includes a box body, a cover plate, a force-bearing component, and a connecting member. The box body is provided with an installation position. The cover plate, the installation position, and the force-bearing component are sequentially arranged in a first direction and are connected to each other through the connecting member. The positive projection of the force-bearing component on the cover plate in the first direction covers at least a part of the connecting member. The connecting member is configured to enable the force-bearing component to drive at least a part of the connecting member to move relative to the installation position to drive the cover plate to move when the impact force received by the force-bearing component exceeds a threshold value, so as to form a pressure relief channel between the cover plate and the installation position, and realize local pressure relief through the pressure relief channel to reduce the pressure generated by the explosion. With such a setting, the possibility that the cover plate or the connecting member flies out during an explosion in the explosion-proof box can be reduced, and the safety of surrounding equipment and personnel can be ensured.

[0043] The electronic devices of the present application include, but are not limited to, inverters, motor controllers, converters, transformers, power supply devices, etc.

[0044] The explosion-proof box and the power conversion device of the present application will be described in detail below with reference to the accompanying drawings. The features in the following embodiments and implementation manners can be combined with each other without conflict.

[0045] Referring to Figure 1 , an explosion-proof box provided by an embodiment of the present application includes a box body 1, a cover plate 2, a force-bearing component 3, and a connecting member 4. The box body 1 is provided with an installation position 10. The installation position 10 can be a folded edge extending inside the box body 1 or a local protrusion extending inwardly of the box body to ensure that the connecting member 4 has sufficient installation space to connect the cover plate 2 and the force-bearing component 3. The cover plate 2, the installation position 10, and the force-bearing component 3 are sequentially arranged in a first direction X and are connected to each other through the connecting member 4. The box body 1 has an opening, and the cover plate 2 is arranged on a side of the box body 1 away from the force-bearing component 3 and covers the opening of the box body. The force-bearing component 3 is arranged on a side of the box body 1 away from the cover plate 2 and is connected to the box body 1 through the connecting member 4. The connecting member 4 includes, but is not limited to, screws, pins, snap-fasteners, etc. The force-bearing component 3 and the connecting member 4 can be directly connected through screws, snap-fasteners or pins, etc., or the connecting member 4 can be in direct abutting contact with the force-bearing component 3 without physical connection, and the above functions can also be realized.

[0046] The positive projection of the force-bearing component 3 on the cover plate 2 in the first direction X covers at least a part of the connecting member 4. Continuing to refer to Figure 1, part of the connecting member 4 is connected to the force-bearing component 3. The force-bearing component 3 has a certain area and can cover at least two connecting members 4 connected to the box body 1. The force-bearing component 3 can be a flat plate body with a certain area, or multiple plate bodies with a certain width, or a curved surface shell with a certain area. When the impact force generated by the explosion inside the box body 1 on the force-bearing component 3 or the impact force exceeds the threshold value, the force-bearing surface of the force-bearing component 3 can drive at least part of the connecting member 4 to move relative to the installation position 10 under the action of the impact pressure, so as to drive the cover plate 2 to move, thereby forming a pressure relief channel between the cover plate 2 and the installation position 10, and realizing local pressure relief through the pressure relief channel to reduce the pressure generated by the explosion. The pressure relief channel formed in this way can complete the release of the internal pressure, reduce the possibility that the cover plate 2 or the connecting member 4 will fly out when the electronic device 8 in the explosion-proof box explodes, and ensure the safety of the surrounding equipment and personnel.

[0047] In Figure 2 In the illustrated embodiment, the force-bearing component 3 has a first force-bearing area 310 and a second force-bearing area 311, and the area of the first force-bearing area 310 is 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, and the force-bearing surface 31 is located on the side of the force-bearing component 3 facing away from the installation position 10. The force-bearing surface 31 can be arranged opposite to the electronic device 8 in the explosion-proof box, as Figures 4 to 7 shown. It can be understood that according to the formula force = pressure * area, assuming that the explosion pressure generated by the explosion inside the box body 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 explosion thrust received by the first force-bearing area 310 is much greater than the explosion thrust received by the second force-bearing area 311. Therefore, when the impact force received by the first force-bearing area 310 or the impact force exceeds the threshold value, at least part of the connecting member 4 covered by the first force-bearing area 310 can move relative to the installation position 10 to drive the cover plate 2 to move, thereby forming a pressure relief channel between the cover plate 2 and the installation position 10, and realizing local pressure relief through the pressure relief channel to reduce the pressure generated by the explosion. And since the outward explosion thrust received by the second force-bearing area 311 is smaller, it can ensure the connection between the cover plate 2 and the installation position 10, and avoid the possibility that the cover plate 2 will fly out when the electronic device in the explosion-proof box explodes, ensuring the safety of the surrounding equipment and personnel.

[0048] In Figure 4In the illustrated embodiment, the first force-bearing area 310 includes a force-bearing plate 30, and the second force-bearing area 311 includes a connecting rod 32. The connecting rod 32 extends along the second direction Y. One end of the connecting rod 32 is connected to the force-bearing plate 30. The second direction Y is perpendicular to the first direction X. At least a part of the connecting member 4 is connected to the connecting rod 32, and the remaining part of the connecting member 4 is connected to the force-bearing plate 30. When the impact force or the impact force received by the force-bearing plate 30 exceeds the threshold value, the outward thrust received by the force-bearing plate 30 drives the connecting member 4 and the cover plate 2 to move relative to the installation position 10, so as to form a pressure relief channel between the cover plate 2 and the installation position 10, and local pressure relief is realized through the pressure relief channel to reduce the pressure generated by the explosion. Since the outward explosion thrust received by the connecting rod 32 is small, the connection between the cover plate 2 and the installation position 10 can be ensured, and the possibility that the cover plate 2 flies out when the electronic device 8 in the explosion-proof box explodes can be avoided, ensuring the safety of surrounding equipment and personnel. At the same time, by arranging the connecting rod 32 in the first force-bearing area 310 and connecting it to the connecting member 4, under the action of the thrust generated in the second force-bearing area 311, the first force-bearing area 310 generates a reverse thrust moving towards the inside of the box body 1, strengthening the connection force of the connecting member 4.

[0049] In Figure 5 In the illustrated embodiment, the first force-bearing area 310 includes a force-bearing plate 30, and the second force-bearing area 311 includes a connecting rod 32. The connecting rod 32 extends along the second direction Y. One end of the connecting rod 32 is connected to the force-bearing plate 30. A plurality of connecting rods 32 are arranged at intervals, and the plurality of connecting rods 32 arranged at intervals are connected through the connecting rods 32 and the force-bearing plate 30. With such an arrangement, the area of the second force-bearing area 311 is increased, and the explosion impact force can be contacted and borne in a larger range, reducing the risk of damage or failure of the connecting rod 32 caused by excessive local force, and ensuring the stability and reliability of the connecting rod 32 under the explosion impact.

[0050] In Figure 6 In the illustrated embodiment, the first force-bearing area 310 includes a force-bearing plate 30, and the second force-bearing area 311 includes a connecting rod 32. The connecting rod 32 extends along the second direction Y. One end of the connecting rod 32 is connected to the force-bearing plate 30. A plurality of connecting rods 32 are arranged at intervals, and the plurality of connecting rods 32 arranged at intervals are connected through the connecting rods 32 and the force-bearing plate 30. The force-bearing plate 30 is provided with a notch portion, which can ensure that when the force-bearing plate 30 receives an outward thrust, it can drive the connecting member 4 and the cover plate 2 to move relative to the installation position 10, so as to form a pressure relief channel between the cover plate 2 and the installation position 10, and while realizing local pressure relief through the pressure relief channel, the area of the first force-bearing area 310 is reduced, thereby reducing the overall weight of the force-bearing assembly 3 and reducing the cost.

[0051] In Figure 7In the illustrated embodiment, a plurality of through holes are provided on the force-bearing component 3 to form a second force-bearing area 311, and the area without through holes forms a first force-bearing area 310. With this arrangement, by increasing the area of the second force-bearing area 311, the impact force can be more evenly distributed over the entire force-bearing component 3. Through the dispersing effect of the second force-bearing area 311, the risk of excessive local stress is reduced, ensuring the stability and reliability of the force-bearing component 3 under explosion shock.

[0052] In the above Figures 5 to 7 embodiment, the area of the first force-bearing area 310 is greater than that of the second force-bearing area 311. The first force-bearing area 310 can be a complete force-bearing plate 30 or a hollowed-out force-bearing plate 30. The second force-bearing area 311 can be a rod or a hollowed-out force-bearing plate 30, as long as the area of the first force-bearing area 310 is greater than that of the second force-bearing area 311. The specific implementation method is not limited.

[0053] In Figure 3 the illustrated embodiment, the explosion-proof box includes a limiting member 5. The limiting member 5 is provided on the side of the installation position 10 facing the force-bearing component 3 and abuts against the force-bearing component 3. The orthographic projection of the limiting member 5 on the force-bearing surface 31 in the first direction X 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 value, 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 value, the design of the limiting member 5 plays a role of restricting and guiding the movement of the force-bearing component 3 in the explosion-proof box. Exemplarily, the limiting member 5 serves as a fulcrum, and the force-bearing component 3 abuts against the limiting member 5 as a lever. Thus, under the thrust generated by the explosion, the first force-bearing area of the force-bearing component 3 rotates around the limiting member 5, and further at least part of the cover plate 2 moves relative to the installation position 10 to form a pressure relief channel between the cover plate 2 and the installation position 10, and the remaining part of the cover plate 2 moves towards the installation position 10 to achieve locking between the cover plate 2 and the installation position 10. That is, the second force-bearing area receives a reverse thrust from the first force-bearing area, so that while reducing the pressure generated by the explosion, the cover plate 2 can be prevented from flying out, ensuring personal safety and enhancing the safety performance of the explosion-proof box.

[0054] In Figure 8In the illustrated embodiment, the number of the connecting members 4 is multiple, and the multiple connecting members 4 are respectively arranged on both sides of the limiting member 5 along the second direction Y, and the second direction Y is perpendicular to the first direction X. With such an arrangement, the limiting member 5 serves as a fulcrum, and the force-bearing assembly 3 abuts against the limiting member 5 as a lever. The connecting member 4 arranged on one side of the limiting member 5 along the second direction Y can cause the force-bearing assembly 3 to rotate around the limiting member 5 under the thrust generated by the explosion, so as to realize the movement of at least part of the cover plate 2 relative to the installation position 10 to form a pressure relief channel between the cover plate 2 and the installation position 10. The connecting member 4 arranged on the other side of the limiting member 5 along the second direction Y can cause the force-bearing assembly 3 to rotate around the limiting member 5 under the thrust generated by the explosion, so as to realize the movement of part of the cover plate 2 towards the installation position 10 to achieve the locking between the cover plate 2 and the installation position 10. Thus, while reducing the pressure generated by the explosion, the cover plate 2 can be prevented from flying out, ensuring personal safety and enhancing the safety performance of the explosion-proof box.

[0055] In Figure 9 and Figure 10 the illustrated embodiment, the force-bearing assembly 3 includes a plurality of connecting rods 32 and a force-bearing plate 30 connecting the plurality of connecting rods 32. The plurality of connecting members 4 are arranged on the connecting rods 32 and the force-bearing plate 30 along the second direction Y, and the second direction Y is the extending direction of the connecting rods 32.

[0056] It can be understood that in Figure 13 the illustrated embodiment, the limiting member 5 serves as a fulcrum, the connecting rod 32 abuts against the limiting member 5 as a lever. When the impact force received by the force-bearing plate 30 exceeds the threshold value, the connecting rod 32 is driven to rotate around the limiting member 5, so as to realize the movement of at least part of the cover plate 2 opposite to the force-bearing plate 30 relative to the box body 1 to form a pressure relief channel between the cover plate 2 and the installation position 10. Since the outward explosion thrust received by the connecting rod 32 is relatively small, the connecting rod 32 can rotate around the limiting member 5 to drive part of the cover plate 2 towards the installation position 10 to achieve the locking between the cover plate 2 and the installation position 10. While reducing the pressure generated by the explosion, the cover plate 2 can be prevented from flying out, ensuring personal safety and enhancing the safety performance of the explosion-proof box.

[0057] In some embodiments, the connecting member 4 includes a plurality of first connecting members 40 and a plurality of second connecting members 41, and the connection strength between the first connecting member 40 and the installation position 10 is greater than the connection strength between the second connecting member 41 and the installation position 10. As Figure 9 and Figure 11 shown, the plurality of first connecting members 40 are arranged at intervals and connect the cover plate 2, the box body 1 and the connecting rod 32; as Figure 10As shown, a plurality of second connectors 41 are arranged at intervals and connect the cover plate 2, the box body 1 and the force-bearing plate 30. When the impact force received by the force-bearing assembly 3 exceeds the threshold, the second connector 41 moves relative to the installation position 10 to drive the cover plate 2 to move towards the side away from the box body, so as to form a pressure relief channel between the cover plate 2 and the installation position 10. When the impact force received by the force-bearing assembly 3 exceeds the threshold, the first connector 40 receives a directional thrust and moves towards the inside of the box body relative to the installation position 10 to realize the locking of the cover plate 2 and the installation position 10. By setting the connection strength between the first connector 40 and the installation position 10 to be greater than the connection strength between the second connector 41 and the installation position 10, the second connector 41 is more likely to loosen the limitation of the installation position 10 under the action of the impact force and move. The strength of the first connector and the connection locking force of the cover plate are greater.

[0058] It can be understood that the first connector 40 and the second connector 41 in the embodiments of the present application can be designed differently themselves. For example, in some embodiments, high-strength threaded connections can be adopted between the first connector 40, the connecting rod 32 and the box body 1, high-strength threaded connections can be adopted between the second connector 41 and the force-bearing plate 30, and low-strength threaded connections can be adopted between the second connector 41 and the box body 1. 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 the strength of the second connector 41. In addition, the connection strength between the first connector 40 and the installation position being greater than the connection strength between the second connector 41 and the installation position can also be understood as that the connection between the first connector and the installation position can be an interference connection to achieve a connection strength greater than that between the second connector and the installation position, or the installation hole for the second connector to connect the installation position is set to be larger, so that the second connector can more easily get rid of the limitation of the installation position and realize that the connection strength between the second connector and the installation position is less than the connection strength between the first connector 40 and the installation position. The above are all embodiments, and the specific implementation methods are not limited.

[0059] In Figure 14 In the shown embodiment, the second connector 41 is a bolt 410. The bolt 410 has a first thread 4100 and a second thread 4101. The bolt 410 is threadedly connected to the threaded hole 33 on the force-bearing plate 30 through the first thread 4100, and the bolt 410 is threadedly connected to the box body 1 through the second thread 4101, as Figure 10As shown. With such a setting, it is ensured that the threaded connection between the first thread 4100 and the force-bearing plate 30 is firm and reliable, so that it can withstand the impact force during an explosion. At the same time, the threaded connection between the second thread 4101 and the box body 1 should be designed to fail when the force-bearing assembly 3 is subjected to an impact force exceeding the threshold, causing the bolt 410 to move relative to the box body 1. Specifically, the bolt 410 is configured such that when the impact force received by the force-bearing assembly 3 exceeds the threshold, the connection between the second thread 4101 and the box body 1 fails, causing the bolt 410 to move relative to the box body 1, so that the force-bearing plate 30 and the cover plate 2 connected to the second connecting member 41 move relative to the box body 1 to open the installation position 10, thereby reducing the pressure generated by the explosion. Exemplarily, materials of different strengths can be selected or processes such as heat treatment can be used to make the strength of the first thread 4100 greater than that of the second thread 4101. Or, the strength of the first thread 4100 can be made greater than that of the second thread 4101 by differentially designing the dimensions and shapes 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 more compact thread shape can be adopted to increase the strength of the first thread 4100, and the present application does not limit this.

[0060] In Figure 15 In the illustrated embodiment, the first connecting member 40 is a bolt 410, and the bolt 410 has a first thread 4100, which can be a high-strength thread, so as to ensure a firm and reliable threaded connection between the first thread 4100 and the force-bearing plate 30, the box body 1, and the cover plate 2. Exemplarily, the strength of the first thread 4100 can be increased by processes such as heat treatment. Or, the strength of the first thread 4100 can be increased by increasing the diameter or depth of the first thread 4100, or by adopting a more compact thread shape, and the present application does not limit this.

[0061] In some other embodiments, the connecting member 4 includes a plurality of first connecting members 40 and a plurality of second connecting members 41. The connection strength between the first connecting member 40 and the mounting position 10 is greater than the connection strength between the second connecting member 41 and the mounting position 10. In the embodiments of the present application, the first connecting member 40 and the second connecting member 41 have the same specifications. By differentially designing 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 the threshold value, the connection between the second connecting member 41 and the mounting position 10 fails, while the connection between the first connecting member 40 and the mounting position 10 remains stable. Exemplarily, mounting holes with different depths are provided for different connecting members 4. For the second connecting member 41 that needs to fail, the size of its mounting hole in the first direction X is smaller; for the first connecting member 40 that needs to be stably connected, the size of its mounting hole in the first direction X is larger. Or, for the second connecting member 41 that needs to fail, the inner surface of its mounting hole is relatively smooth; for the first connecting member 40 that needs to be stably connected, the inner surface of its mounting hole is relatively rough. Or, for the second connecting member 41 that needs to fail, the aperture of its mounting hole is relatively large. For the first connecting member 40 that needs to be stably connected, the aperture of its mounting hole is designed to match or be smaller than the size of the connecting member 4.

[0062] In Figure 12 In the illustrated embodiment, the size of the first connecting member 40 in the first direction X is greater than the size of the second connecting member 41 in the first direction X. The first connecting member 40 passes through the force-bearing component 3, and a limiting portion 400 is provided on the side of the first connecting member 40 close to the mounting position 10, and the limiting portion 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 connecting member passes through the second end 321 of the connecting rod 32. It can be understood that when the force-bearing plate 30 receives an outward explosion thrust, the explosion thrust drives the cover plate 2 connected to the force-bearing plate 30 to move relative to the box body 1 to form a pressure relief channel between the cover plate 2 and the mounting position 10. At the same time, through the arrangement of the limiting member 5, the first end 320 of the connecting rod 32 will rotate around the limiting member 5, thereby converting the outward thrust of the force-bearing plate 30 into an inward locking force at the second end 321. By increasing the size of the first connecting member 40 in the first direction X, the second end 321 of the connecting rod 32 can drive the cover plate 2 to move toward the side close to the mounting position 10, so as to realize the locking between the cover plate 2 and the mounting position 10, ensure that the cover plate 2 will not loosen or detach under the explosion pressure, and thus enhance the safety performance of the explosion-proof box. The design of the limiting portion 400 can prevent the second end 321 of the connecting rod 32 from driving the cover plate 2 to move toward the side away from the mounting position 10 under some working conditions, and prevent the cover plate 2 from detaching under the explosion pressure, thereby ensuring the safety of surrounding equipment and personnel.

[0063] In some other embodiments, the cover plate 2 is provided with an installation groove for the connecting member 4. By arranging a corrugated member in the installation groove of the first connecting member 40, the corrugated member has stretchability to adapt to the relative displacement between the cover plate, the first connecting member 40 and the installation groove caused by explosion shock, so that the first connecting member 40 can displace along the first direction X, thereby driving the second end 321 connected to the first connecting member 40 to drive the cover plate 2 to move towards the side close to the installation position 10, so as to realize the locking between the cover plate 2 and the installation position 10, ensuring that the cover plate 2 will not loosen or detach under explosion pressure, thereby enhancing the safety performance of the explosion-proof box.

[0064] In some embodiments, the force-bearing assembly 3 does not need to be provided with a connecting rod 32, and only a force-bearing plate 30 needs to be provided. The cover plate 2, the installation position 10 and the force-bearing plate 30 are connected to each other through the connecting member 4. Among them, the force-bearing plate 30 is arranged on the explosion air flow path of the electronic device 14. Figure 16 In the illustrated embodiment, when the electronic device 14 in the box body 1 is correspondingly arranged with the force-bearing plate 30 in the first direction X. If the electronic device 14 explodes, the impact force generated by the explosion can drive the force-bearing plate 30 and the cover plate 2 connected to the force-bearing plate 30 to move away from the installation position 10, so as to form a pressure relief channel between the cover plate 2 and the installation position 10, and thus realize local pressure relief through the pressure relief channel to reduce the pressure generated by the explosion.

[0065] In Figure 17 In the illustrated embodiment, the explosion-proof box includes a diversion member 6. The diversion member 6 and the side wall of the box body 1 enclose a diversion channel 7, and the diversion channel 7 is arranged opposite to the force-bearing surface 31. If the electronic device 14 in the box body 1 is staggered with the force-bearing plate 30 in the first direction X, the diversion member 6 can be arranged to guide the high-temperature and high-pressure gas generated during the explosion to the force-bearing surface 31 of the force-bearing plate 30 through the diversion channel 7, so as to drive the force-bearing plate 30 and the cover plate 2 connected to the force-bearing plate 30 to move away from the installation position 10, so as to form a pressure relief channel between the cover plate 2 and the installation position 10, and thus realize local pressure relief through the pressure relief channel to reduce the pressure generated by the explosion.

[0066] In Figure 18 In the illustrated embodiment, the number of the diversion members 6 is multiple, and the multiple diversion members 6 enclose a diversion channel 7, and the diversion channel 7 is arranged opposite to the force-bearing surface 31 to guide the high-temperature and high-pressure gas generated during the explosion to the force-bearing surface 31 of the force-bearing plate 30 through the diversion channel 7. With such an arrangement, it is ensured that the electronic device 8 in the explosion-proof box can normally play the function of pressure relief and explosion protection under different layout conditions.

[0067] In some embodiments, the force-bearing component 3 contacts the side wall of the box body 1. The force-bearing component 3 is made of high thermal conductivity materials such as metal materials and ceramic materials. The contact between the force-bearing component 3 and the side wall of the box body 1 can transfer the heat inside the explosion-proof box to the external environment through the force-bearing component 3, the connecting piece 4, and the cover plate 2, thereby playing a role in heat dissipation, reducing the temperature inside the explosion-proof box, preventing problems caused by overheating, and further improving the safety and reliability of the explosion-proof box.

[0068] Correspondingly, an embodiment of the present application provides a power conversion device, including the above-mentioned explosion-proof box; a plurality of electronic devices 8 are arranged in the box body 1 of the explosion-proof box. Therefore, this power conversion device can have all the technical features and beneficial effects of the above-mentioned explosion-proof box, which will not be elaborated here.

[0069] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] The above has introduced in detail an explosion-proof box and a power conversion device provided by the embodiments of the present application, and specific examples have been used to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An explosion-proof box, characterized in that: Including box body, cover plate, load-bearing components and connectors, The box body is provided with a mounting position, The cover plate, the mounting position and the force-bearing component are arranged in sequence in the first direction and are connected to each other through the connecting member; the orthographic projection of the force-bearing component on the cover plate along the first direction covers at least a portion of the connecting member.

2. The explosion-proof box according to claim 1, characterized in that: The force-bearing component includes a force-bearing plate, and the cover plate, the mounting position and the force-bearing plate are connected to each other via the connecting member.

3. The explosion-proof box according to claim 2, characterized in that: The explosion-proof box includes a flow guide member, which is enclosed with the side wall of the box body to form a flow guide channel, and the flow guide channel is arranged opposite to the force-bearing plate.

4. The explosion-proof box according to claim 1, characterized in that: The force-bearing component has a first force-bearing area and a second force-bearing area, and the area of ​​the first force-bearing area is larger than the area of ​​the second force-bearing area.

5. The explosion-proof box according to claim 4, characterized in that: The first force-bearing area includes a force-bearing plate, and the second force-bearing area includes a connecting rod, the connecting rod extends 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.

6. The explosion-proof box according to any one of claims 4 or 5, characterized in that: The explosion-proof box includes a limiter, which is arranged on a side of the installation position facing the force-bearing component and abuts against the force-bearing component, and the orthographic projection of the limiter 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, characterized in that: There are multiple connecting members, and the multiple connecting members are respectively arranged on both sides of the limiting member along the second direction, and the second direction is perpendicular to the first direction.

8. The explosion-proof box according to any one of claims 1 to 7, characterized in that: The connection strength between the connecting member and the mounting position is less than the connection strength between the connecting member and the force-bearing component.

9. The explosion-proof box according to any one of claims 1 to 7, characterized in that: The connecting member includes a plurality of first connecting members and a plurality of second connecting members, and the connection strength between the first connecting member and the installation position is greater than the connection strength between the second connecting member and the installation position.

10. The explosion-proof box according to claim 9, characterized in that: A size of the first connecting member in the first direction is greater than a size of the second connecting member in the first direction.

11. The explosion-proof box according to claim 10, characterized in that: The first connecting member is inserted through the force-bearing component, and a limiting portion is provided on a side of the first connecting member close to the installation position, and the limiting portion is located on a side of the force-bearing component away from the installation position.

12. The explosion-proof box according to claim 1, characterized in that: The force-bearing component is in contact with the side wall of the box body.

13. A power conversion device, characterized in that: comprising an explosion-proof box as claimed in any one of claims 1 to 12; A plurality of electronic devices are arranged in the explosion-proof box.

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