Explosion-proof cabinet and power electronic device

Abstract

The utility model provides a kind of explosion-proof machine case and power electronics equipment, explosion-proof machine case includes: cabinet, with opening;Flanging structure, around the opening position of cabinet and is connected with cabinet;Cover, cover is established on opening;Multiple connecting components, each connecting component is connected flanging structure and cover respectively, cabinet is sequentially connected and fixed with cover through flanging structure, connecting component, wherein, structural connection strength between at least one connecting component and flanging structure is weaker than structural connection strength between other connecting components and flanging structure.The utility model's explosion-proof machine case makes structural connection strength between at least one connecting component and flanging structure weaker than structural connection strength between other connecting components and flanging structure, so that structural connection strength between each connecting component and flanging structure forms difference, makes internal gas discharge from position of structural connection strength weaker, improves the security of explosion-proof machine case.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment, specifically to an explosion-proof enclosure and power electronic equipment. Background Technology

[0002] Currently, existing string inverters, energy storage converters, and other electronic devices contain a large number of electrolytic capacitors, film capacitors, and other electronic components. These components may fail during operation, releasing flammable gases such as hydrogen and methane. If these flammable gases accumulate inside the electronic device to a certain level, it can cause excessive internal pressure, potentially leading to an explosion. The force of such an explosion could cause the device's casing to fly off, posing a safety hazard to other objects or people. Utility Model Content

[0003] This utility model aims to at least solve the problem in the prior art that explosions caused by excessive pressure inside electronic equipment can lead to the casing cover flying off, which can easily cause safety hazards. It proposes an explosion-proof casing and power electronic equipment.

[0004] To achieve the purpose of this utility model, an explosion-proof enclosure is provided, comprising: an enclosure body having an opening; a flange structure surrounding the opening of the enclosure body and connected to the enclosure body; a cover plate covering the opening; and a plurality of connecting components, each of the connecting components connecting the flange structure and the cover plate respectively, wherein the enclosure body is sequentially connected and fixed to the cover plate via the flange structure, the connecting components, and the cover plate, wherein the structural connection strength between at least one connecting component and the flange structure is weaker than the structural connection strength between other connecting components and the flange structure.

[0005] In some embodiments, all the connecting components include: at least one first connecting component and a plurality of second connecting components, wherein the structural connection strength between the first connecting component and the flange structure is weaker than the structural connection strength between the second connecting component and the flange structure, and the number of the first connecting components is less than the number of the second connecting components.

[0006] In some embodiments, the connecting assembly includes: a press-fit nut, press-fitted onto the flange structure; a bolt, passing through the cover plate and threadedly connected to the press-fit nut; in all the connecting assemblies, the press-fit nut of at least one connecting assembly is located on the side of the flange structure facing the cover plate, and the press-fit nuts of the other connecting assemblies are located on the side of the flange structure away from the cover plate.

[0007] In some embodiments, the flange structure has a first surface facing the cover plate and a second surface facing away from the cover plate. The first surface is provided with a clearance groove, which forms a clearance space with the cover plate. At least one of the press-fit nuts is located in the clearance groove and press-fitted to the bottom of the clearance groove, so that the distance between the cover plate and the first surface is less than the thickness of the sealing ring. Other press-fit nuts are located on the second surface.

[0008] In some embodiments, the flange structure is provided with at least one weakening structure, which corresponds to the connecting component and is disposed at the connection position between the corresponding connecting component and the flange structure to weaken the structural connection strength between the corresponding connecting component and the flange structure.

[0009] In some embodiments, the connecting assembly includes: a press-fit nut press-fitted onto the flange structure; a bolt passing through the cover plate and threadedly connected to the press-fit nut; and a weakening structure surrounding the press-fit nut of the corresponding connecting assembly.

[0010] In some embodiments, the weakening structure comprises at least two weakening grooves, all of which are circumferentially spaced around the corresponding rivet nut.

[0011] In some embodiments, there are three weakening grooves, each of which is arc-shaped, and the three weakening grooves are evenly spaced around the corresponding rivet nut in the circumferential direction.

[0012] In some embodiments, the flange structure has a first surface facing the cover plate and a second surface facing away from the cover plate, and the rivet nut is riveted on the second surface; the cover plate has an inner surface facing the housing, and the inner surface is formed with a plurality of abutting protrusions that abut against the first surface, all of the abutting protrusions being provided in a one-to-one correspondence with all of the connecting components, and at least one of the abutting protrusions covering the weakening structure.

[0013] In some embodiments, the weakening groove extends through the second surface from the first surface.

[0014] According to another aspect of this utility model, a power electronic device is also disclosed, comprising: an explosion-proof enclosure and a power electronic device body disposed within the explosion-proof enclosure; wherein the explosion-proof enclosure is the aforementioned explosion-proof enclosure.

[0015] This invention relates to an explosion-proof enclosure and power electronic equipment. By ensuring that the structural connection strength between at least one connecting component and the flanged structure is weaker than that between other connecting components and the flanged structure, a difference in structural connection strength is created between each connecting component and the flanged structure. During use, when the internal pressure of the explosion-proof enclosure becomes excessive, the connecting component with the weaker structural connection strength will be pulled out, allowing internal gas to escape from the weaker connection point. This pressure relief prevents an explosion due to excessive internal pressure, avoids the cover plate flying off, and improves the safety of the explosion-proof enclosure. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the explosion-proof enclosure according to Embodiment 1 of this utility model;

[0017] Figure 2 This is a schematic diagram of the assembly of the press-fit nuts for the explosion-proof enclosure according to Embodiment 1 of this utility model;

[0018] Figure 3 This is a schematic diagram of the explosion-proof enclosure according to Embodiment 2 of this utility model;

[0019] Figure 4 for Figure 3 Sectional view along line AA in section C;

[0020] Figure 5 This is a schematic diagram of the weakened structure of the explosion-proof enclosure according to Embodiment 2 of this utility model;

[0021] Figure 6 for Figure 3 Sectional view of part C along the BB direction;

[0022] List of reference numerals in the attached diagram:

[0023] 10. Box body; 20. Flanged structure; 21. First surface; 211. Clearance groove; 22. Second surface; 30. Cover plate; 31. Inner surface; 311. Abutment protrusion; 32. Outer surface;

[0024] 321. Mounting slot; 40. Connecting assembly; 41. Press-fit nut; 42. Bolt; 43. Washer;

[0025] 50. Weakening structure; 60. Sealing ring. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the explosion-proof enclosure and power electronic equipment provided by this utility model will be described in detail below with reference to the accompanying drawings.

[0027] In some related technologies, to prevent the cover from flying off due to excessive internal pressure in the chassis of electronic devices, the connection strength between the chassis body and the cover is usually made different at different connection points. When the gas pressure inside the chassis is too high, the weaker connection between the chassis body and the cover will break off first, allowing the gas inside the chassis to escape from the point where the chassis body and the cover are separated. This achieves the purpose of rapid pressure relief, prevents the cover from flying off, and improves safety.

[0028] In related technologies, the enclosure and the cover are usually connected and fixed by multiple connecting components. The connecting components generally use bolts and press-fit nuts. The press-fit nuts are used to connect and fix the enclosure to the enclosure, and then the bolts and press-fit nuts are used to fix the enclosure and the cover together.

[0029] To create differences in connection strength at different connection points between the housing and the cover, the connection strength of most of the press-fit nuts to the housing is usually increased, while the connection strength of a small number of press-fit nuts remains unchanged. This allows the gas pressure to pull out the press-fit nuts whose connection strength has not been increased, thereby achieving pressure relief.

[0030] However, to increase the connection strength between the rivet nut and the housing, it is necessary to increase the pressing area, thickness, or material of the rivet nut. Therefore, most rivet nuts need to be redesigned and manufactured, which undoubtedly increases materials, process steps, and costs. Thus, how to avoid explosions caused by excessive pressure inside the housing, resulting in the housing cover flying off and creating safety hazards, while also considering cost, is a problem that urgently needs to be solved in this field.

[0031] To address the aforementioned technical problems, according to one aspect of this utility model, an explosion-proof enclosure is disclosed, comprising: an enclosure body 10, a flanged structure 20, a cover plate 30, and connecting components 40. The enclosure body 10 has an opening; the flanged structure 20 surrounds the opening of the enclosure body 10 and is connected to the enclosure body 10; the cover plate 30 covers the opening; there are multiple connecting components 40, each connecting component 40 connecting the flanged structure 20 and the cover plate 30 respectively, and the enclosure body 10 is sequentially connected and fixed to the cover plate 30 through the flanged structure 20 and the connecting components 40, wherein the structural connection strength between at least one connecting component 40 and the flanged structure 20 is weaker than the structural connection strength between other connecting components 40 and the flanged structure 20.

[0032] The explosion-proof enclosure of this invention features a structural connection strength between at least one connecting component 40 and the flanged structure 20 that is weaker than the structural connection strength between other connecting components 40 and the flanged structure 20. This creates a difference in the structural connection strength between each connecting component 40 and the flanged structure 20. During use, when the internal pressure of the explosion-proof enclosure becomes excessive, the connecting component 40 with the weakest structural connection strength will be pulled out first. This allows the internal gas to escape from the weakest connection point, thus relieving pressure and preventing an explosion due to excessive internal pressure. It also prevents the cover plate 30 from flying off, thereby improving the safety of the explosion-proof enclosure.

[0033] All connecting components 40 include: at least one first connecting component and multiple second connecting components. The structural connection strength between the first connecting component and the flange structure 20 is weaker than the structural connection strength between the second connecting components and the flange structure 20, and the number of first connecting components is less than the number of second connecting components. This method differs from related technologies in enhancing connection strength. Since the structural connection strength between the second connecting components and the flange structure 20 remains unchanged, no changes are needed between the more numerous second connecting components and the flange structure 20. Only the connection between the fewer numerous first connecting components and the flange structure 20 needs to be weakened. Therefore, modification costs can be reduced and modification efficiency improved.

[0034] The specific structure of the explosion-proof enclosure of this utility model will be further described below with reference to specific embodiments.

[0035] In such Figure 1 and Figure 2 In the first embodiment of this utility model shown, multiple connecting components 40 are circumferentially distributed around the opening of the housing 10. Each connecting component 40 includes a press-fit nut 41 and a bolt 42. The press-fit nut 41 is press-fitted onto the flange structure 20; the bolt 42 passes through the cover plate 30 and is threadedly connected to the press-fit nut 41. In other words, each connecting component 40 includes a press-fit nut 41 and a bolt 42. The press-fit nut 41 is connected and fixed to the flange structure 20 by press-fitting, while the cover plate 30 has bolt holes, each corresponding to a position of the press-fit nut 41. The bolt 42 passes through the bolt holes in the cover plate 30 and is threadedly connected to the corresponding bolt 42, thereby fixing the cover plate 30 to the flange structure 20, and consequently fixing the cover plate 30 to the housing 10.

[0036] In all the connecting components 40, the rivet nut 41 of at least one connecting component 40 is located on the side of the flange structure 20 facing the cover plate 30, while the rivet nut 41 of the other connecting components 40 is located on the side of the flange structure 20 away from the cover plate 30.

[0037] When the gas pressure inside the explosion-proof enclosure is too high, the gas pressure will push the cover plate 30 and the enclosure body 10 in opposite directions. Therefore, the cover plate 30 applies a pull-out force to the rivet nut 41 through the bolt 42, and the direction of the pull-out force on the rivet nut 41 is towards the cover plate 30. When the rivet nut 41 is located on the side of the flange structure 20 away from the cover plate 30, the rivet nut 41 and the flange structure 20 are not only fixed by the riveting connection, but are also blocked and limited by the flange structure 20. Therefore, in order to separate the rivet nut 41 from the flange structure 20, the pull-out force must not only be greater than the structural connection strength limit of the riveting connection between the rivet nut 41 and the flange structure 20, but also greater than the material strength limit of the flange structure 20. In other words, due to the blocking and limiting effect of the flange structure 20, the press-fit nut 41 can be effectively prevented from moving in the direction of the pull-out force until the magnitude of the pull-out force exceeds the material strength limit of the flange structure 20. Only then will the press-fit nut 41 break through the flange structure 20 and separate from the flange structure 20 under the action of the pull-out force. Alternatively, the pull-out force will exceed the strength limit of the thread between the bolt 42 and the press-fit nut 41, causing the bolt 42 to separate directly from the press-fit nut 41. This will cause the cover plate 30 to separate from the flange structure 20 at this position before other positions, thereby achieving pressure relief.

[0038] However, the situation is quite different when the rivet nut 41 is riveted on the side of the flange structure 20 facing the cover plate 30. When the rivet nut 41 is also subjected to a pull-out force in the direction of the cover plate 30, since the rivet nut 41 is located on the side of the flange structure 20 facing the cover plate 30, that is, when the rivet nut 41 is located between the cover plate 30 and the flange structure 20, the movement direction of the rivet nut 41 will no longer be blocked or limited by the flange structure 20. When the pull-out force is greater than the structural connection strength limit of the rivet connection between the rivet nut 41 and the flange structure 20, the rivet nut 41 can be pulled out from the flange structure 20, thereby separating the cover plate 30 from the flange structure 20, and then separating the cover plate 30 from the housing 10.

[0039] This invention's explosion-proof enclosure weakens the structural connection strength between the rivet nut 41 and the flange structure 20 by changing the position of the rivet nut 41, thus creating a difference in connection strength between different connecting components 40 and the flange structure 20. Furthermore, it can be seen that by changing the position of the rivet nut 41 to create a difference in structural connection strength, there is no need to modify the rivet nut 41 itself. The same rivet nut 41 can achieve a weakening of structural connection strength simply by changing its position. Therefore, it can greatly simplify the modification process and reduce modification costs.

[0040] like Figure 2As shown, in some embodiments, the flange structure 20 has a first surface 21 facing the cover plate 30 and a second surface 22 facing away from the cover plate 30. The first surface 21 is provided with a clearance groove 211, which forms a clearance space with the cover plate 30. At least one press-fit nut 41 is located in the clearance groove 211 and press-fitted to the bottom of the groove 211, so that the distance between the cover plate 30 and the first surface 21 is less than the thickness of the sealing ring 60; other press-fit nuts 41 are located on the second surface 22. In this way, the thickness of the press-fit nuts 41 can be avoided from being too large, which would affect the sealing performance of the explosion-proof enclosure, thus balancing safety and sealing performance.

[0041] In embodiments of this invention, a sealing ring 60 is typically provided between the cover plate 30 and the flange structure 20 to enhance the sealing performance of the explosion-proof enclosure. Specifically, the flange structure 20 has a first surface 21 facing the cover plate 30 and a second surface 22 facing away from the cover plate 30. The sealing ring 60 is located between the first surface 21 and the cover plate 30. When the bolt 42 and the rivet nut 41 are tightened, the cover plate 30 presses the sealing ring 60 against the first surface 21 of the flange structure 20, thereby achieving a seal inside the explosion-proof enclosure. Similarly, the rivet nut 41, which has a weaker structural connection with the flange structure 20, is also riveted onto the first surface 21 of the flange structure 20. Therefore, if the thickness of the rivet nut 41 is large, for example, greater than the thickness of the sealing ring 60, the rivet nut 41 will obstruct the space between the cover plate 30 and the flange structure 20, resulting in an excessive gap between the cover plate 30 and the flange structure 20. This will prevent the cover plate 30 and the flange structure 20 from pressing the sealing ring 60 tightly, thus affecting the sealing effect of the explosion-proof enclosure.

[0042] In this embodiment, such as Figure 2 As shown, by providing a clearance groove 211 on the first surface 21, the press-fit nut 41 located on the first surface 21 of the flange structure 20 can be placed in the clearance groove 211, thereby reducing the gap between the cover plate 30 and the first surface 21 to less than the thickness of the sealing ring 60, so that the cover plate 30 can press the sealing ring 60 onto the first surface 21, thereby ensuring the sealing performance of the explosion-proof enclosure.

[0043] For example, the clearance groove 211 may be formed on the first surface 21 of the flange structure 20 by a stamping process. At the same time, the stamping process will form a protrusion structure on the second surface 22 of the flange structure 20 at the position corresponding to the clearance groove 211.

[0044] It should be noted that, in the above embodiments, the sealing ring 60 can be disposed on the outside of all connecting components 40 or on the inside of all connecting components 40.

[0045] In some embodiments, the material strength of the rivet nut 41 located on the first surface 21 is not greater than the strength of other rivet nuts 41. In other words, the strength of other rivet nuts 41 may be greater than or equal to the material strength of the rivet nut 41 located on the first surface 21.

[0046] In some embodiments, the thickness of the rivet nut 41 located on the first surface 21 is not greater than the thickness of the other rivet nuts 41. In other words, the thickness of the other rivet nuts 41 may be greater than or equal to the thickness of the rivet nut 41 located on the first surface 21.

[0047] In some embodiments, the tooth range of the press-fit nut 41 located on the first surface 21 is not greater than the tooth range of other press-fit nuts 41. In other words, the tooth range of other press-fit nuts 41 may be greater than or equal to the tooth range of the press-fit nut 41 located on the first surface 21.

[0048] In some embodiments, the pressing area of ​​the rivet nut 41 on the first surface 21 and the flange structure 20 is not greater than the pressing area of ​​the other rivet nuts 41 and the flange structure 20. In other words, the pressing area of ​​the other rivet nuts 41 and the flange structure 20 can be greater than or equal to the pressing area of ​​the rivet nut 41 on the first surface 21 and the flange structure 20.

[0049] It should also be noted that in the above embodiment, the structural connection strength between the connecting assembly 40 and the flange structure 20 is weakened by changing the setting position of the rivet nut 41, but this is not limiting. Figures 3 to 6 The second embodiment also discloses an explosion-proof enclosure, which is basically the same as the first embodiment described above. The difference is that in this embodiment, at least one weakening structure is provided on the flange structure 20. The weakening structure corresponds to the connecting component 40, and the weakening structure 50 is provided at the connection position between the corresponding connecting component 40 and the flange structure 20 to weaken the structural connection strength between the corresponding connecting component 40 and the flange structure 20. By providing the weakening structure 50 on the flange structure 20, the strength at the connection position between the flange structure 20 and the connecting component 40 can be weakened, making it easier for the local structure at that position to detach from other positions of the flange structure 20 after being subjected to a pull-out force, thereby causing the rivet nut 41 to detach from the flange structure 20.

[0050] like Figure 4 and Figure 5 As shown, the connecting assembly 40 includes a press-fit nut 41 and a bolt 42. The press-fit nut 41 is press-fitted onto the flange structure 20; the bolt 42 passes through the cover plate 30 and is threadedly connected to the press-fit nut 41. The weakening structure 50 is arranged around the press-fit nut 41 of the corresponding connecting assembly 40.

[0051] Specifically, when the gas pressure inside the explosion-proof enclosure is too high, the gas pressure will push the cover plate 30 and the enclosure 10 in opposite directions. Therefore, the cover plate 30 applies a pull-out force to the rivet nut 41 through the bolt 42, and the direction of the pull-out force on the rivet nut 41 is towards the cover plate 30. Figure 4 As shown, when the press-fit nut 41 is located on the side of the flange structure 20 away from the cover plate 30, the press-fit nut 41 and the flange structure 20 are not only fixed by press-fit connection, but also blocked and limited by the flange structure 20. Therefore, if the press-fit nut 41 and the flange structure 20 separate, the pull-out force will be greater than the structural connection strength limit of the press-fit connection between the press-fit nut 41 and the flange structure 20, and also greater than the material strength limit of the flange structure 20. In other words, due to the blocking and limiting effect of the flange structure 20, the press-fit nut 41 can be effectively prevented from moving in the direction of the pull-out force until the magnitude of the pull-out force exceeds the material strength limit of the flange structure 20. Only then will the press-fit nut 41 break through the flange structure 20 and separate from the flange structure 20 under the action of the pull-out force. Alternatively, when the magnitude of the pull-out force exceeds the strength limit of the thread between the bolt 42 and the press-fit nut 41, the bolt 42 will be directly separated from the press-fit nut 41, thereby separating the cover plate 30 from the flange structure 20, and then separating the cover plate 30 from the housing 10. Therefore, by setting a weakening structure 50 on the flange structure 20, and by setting the weakening structure 50 around the rivet nut 41 of the corresponding connecting component 40, the material strength limit of the part of the flange structure 20 that blocks and limits the rivet nut 41 is weakened. Therefore, the magnitude of the pull-out force can easily exceed the structural strength limit at this position, making it easier to pull the rivet nut 41 at this position from the flange structure 20, thereby realizing the separation of the cover plate 30 from the flange structure 20 at this position before other positions, and realizing pressure relief.

[0052] In some embodiments, the weakening structure 50 consists of at least two weakening grooves, all of which are circumferentially spaced around the corresponding press-fit nut 41. By providing weakening grooves around the press-fit nut 41, the local strength of the flange structure 20 on the outer periphery of the press-fit nut 41 can be effectively weakened, thereby making it easier for the press-fit nut 41 to detach from the flange structure 20 under the action of pull-out force.

[0053] For example, such as Figure 5 As shown, there are three weakening grooves, each of which is arc-shaped, and the three weakening grooves are evenly distributed around the corresponding press-fit nut 41 in a circumferential direction.

[0054] In this embodiment, the flange structure 20 has a first surface 21 facing the cover plate 30 and a second surface 22 facing away from the cover plate 30, and the rivet nut 41 is riveted on the second surface 22; a weakening groove extends through the second surface 22 from the first surface 21. By providing a through weakening groove, the local strength of the outer peripheral structure of the rivet nut 41 can be weakened to the maximum extent, thereby making it easier for the rivet nut 41 to detach from the flange structure 20 under the action of pull-out force.

[0055] like Figure 4 and Figure 6 As shown, the cover plate 30 has an inner surface 31 facing the housing 10. The inner surface 31 has multiple abutment protrusions 311 that abut against the first surface 21. All abutment protrusions 311 correspond one-to-one with all connecting components 40, and at least one abutment protrusion 311 covers the weakening structure 50. By providing the abutment protrusions 311, the weakening groove can be covered, thereby effectively weakening the structural connection strength between the rivet nut 41 and the flange structure 20, while also preventing the interior of the housing 10 from communicating with the outside through the weakening groove, ensuring the sealing of the explosion-proof housing.

[0056] To enhance the sealing performance of the explosion-proof enclosure, a sealing ring 60 is provided between the cover plate 30 and the flange structure 20. Specifically, the flange structure 20 has a first surface 21 facing the cover plate 30 and a second surface 22 facing away from the cover plate 30. The sealing ring 60 is located between the first surface 21 and the cover plate 30. When the bolt 42 and the rivet nut 41 are tightened, the cover plate 30 presses the sealing ring 60 against the first surface 21 of the flange structure 20, thereby achieving a seal inside the explosion-proof enclosure. Figure 6 In the illustrated embodiment, the sealing ring 60 is disposed on the inner side of all connecting components 40. Figure 6 (Right side of the middle bolt 42), and the sealing ring 60 is located between all the weakening grooves and the opening. After the cover plate 30 and the flange structure 20 press the sealing groove together, the sealing ring 60 can isolate the weakening groove from the inside of the box 10, thereby preventing the inside of the box 10 from communicating with the outside through the weakening groove, and thus improving the sealing performance of the box 10.

[0057] It should be noted that in this embodiment, the weakening groove extends from the first surface 21 through the second surface 22. However, this is not limiting. In other embodiments not shown in the figure, the weakening groove may not extend through the flange structure 20. It may be provided only on the first surface 21 or the second surface 22, or it may be provided on the first surface 21 and the second surface 22 respectively but not connected. This is also feasible and is not limited here.

[0058] In some embodiments, the material strength of the rivet nut 41 corresponding to the weakening structure 50 is not greater than the material strength of other rivet nuts 41. In other words, the material strength of other rivet nuts 41 can be greater than or equal to the material strength of the rivet nut 41 corresponding to the weakening structure 50.

[0059] In some embodiments, the thickness of the rivet nut 41 corresponding to the weakening structure 50 is not greater than the thickness of other rivet nuts 41. In other words, the thickness of other rivet nuts 41 may be greater than or equal to the thickness of the rivet nut 41 corresponding to the weakening structure 50.

[0060] In some embodiments, the tooth range of the press-fit nut 41 corresponding to the weakening structure 50 is not greater than the tooth range of other press-fit nuts 41. In other words, the tooth range of other press-fit nuts 41 is greater than or equal to the tooth range of the press-fit nut 41 corresponding to the weakening structure 50.

[0061] In some embodiments, the pressing area of ​​the rivet nut 41 corresponding to the weakening structure 50 and the flange structure 20 is not greater than the pressing area of ​​other rivet nuts 41 and flange structures 20. In other words, the pressing area of ​​other rivet nuts 41 and flange structures 20 can be greater than or equal to the pressing area of ​​the rivet nut 41 corresponding to the weakening structure 50 and the flange structure 20.

[0062] It should also be noted that, provided that the working principle is not contradictory, in Embodiment 1, a weakening groove can also be added to the bottom of the clearance groove 211, and in Embodiment 2, it is also feasible to set the press nut 41 on the first surface 21 of the flange structure 20 and set the clearance groove 211, without any limitation.

[0063] Understandably, in Figures 1 to 6 In the two embodiments shown, the cover plate 30 has an inner surface 31 facing the flange structure 20 and an outer surface 32 facing away from the flange structure 20. A mounting groove 321 for mounting bolts 42 is provided on the outer surface 32 of the cover plate 30, and bolt holes are provided at the bottom of the mounting groove 321. An abutment protrusion 311 is formed on the inner surface 31 of the cover plate 30 at a position corresponding to the mounting groove 321.

[0064] The connecting assembly 40 also includes a gasket 43, which is fitted onto the bolt 42 and located in the mounting groove 321 to increase the contact area between the bolt 42 and the cover plate 30, thereby improving the connection strength between the bolt 42 and the cover plate 30.

[0065] According to another aspect of this utility model, a power electronic device is also disclosed, comprising: an explosion-proof enclosure and a power electronic device body disposed within the explosion-proof enclosure; wherein the explosion-proof enclosure is the aforementioned explosion-proof enclosure.

[0066] This utility model discloses a power electronic device that, by employing the aforementioned explosion-proof enclosure, ensures that the structural connection strength between at least one connecting component and the flanged structure is weaker than that between other connecting components and the flanged structure, thus creating a difference in the structural connection strength between each connecting component and the flanged structure. During use, when the internal pressure of the explosion-proof enclosure becomes excessive, the connecting component with the weaker structural connection strength will be pulled detached, allowing internal gas to escape from the weaker connection point, thereby achieving pressure relief. This prevents an explosion due to excessive pressure within the explosion-proof enclosure, avoids the cover plate flying off, improves the safety of the explosion-proof enclosure, and ultimately enhances the safety of the power electronic device.

[0067] For example, the power electronic device can be an inverter or other device that uses the aforementioned explosion-proof enclosure; there are no limitations on this.

[0068] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. An explosion-proof chassis, characterized in that, include: Box (10) with an opening; A flange structure (20) surrounds the opening of the box (10) and is connected to the box (10); A cover plate (30) is provided over the opening; Multiple connecting components (40) are provided, each connecting component (40) connecting the flange structure (20) and the cover plate (30) respectively. The box body (10) is connected and fixed to the cover plate (30) in sequence through the flange structure (20), the connecting components (40), and the cover plate (30). The structural connection strength between at least one connecting component (40) and the flange structure (20) is weaker than the structural connection strength between the other connecting components (40) and the flange structure (20).

2. The explosion-proof enclosure according to claim 1, characterized in that, All of the connecting components (40) include: at least one first connecting component and a plurality of second connecting components, wherein the structural connection strength between the first connecting component and the flange structure (20) is weaker than the structural connection strength between the second connecting component and the flange structure (20), and the number of the first connecting components is less than the number of the second connecting components.

3. The explosion-proof enclosure according to claim 1, characterized in that, The connection component (40) includes: A press-fit nut (41) is press-fitted onto the flange structure (20); Bolts (42) are threaded through the cover plate (30) and connected to the press-fit nut (41); Of all the connecting components (40), at least one of the connecting components (40) has a rivet nut (41) located on the side of the flange structure (20) facing the cover plate (30), while the other connecting components (40) have rivet nuts (41) located on the side of the flange structure (20) away from the cover plate (30).

4. The explosion-proof enclosure according to claim 3, characterized in that, The flange structure (20) has a first surface (21) facing the cover plate (30) and a second surface (22) facing away from the cover plate (30). The first surface (21) is provided with a clearance groove (211). The clearance groove (211) forms a clearance space with the cover plate (30). At least one of the press-fit nuts (41) is located in the clearance groove (211) and press-fitted to the bottom of the clearance groove (211) so that the distance between the cover plate (30) and the first surface (21) is less than the thickness of the sealing ring (60). The other press-fit nut (41) is located on the second surface (22).

5. The explosion-proof enclosure according to claim 1, characterized in that, The flange structure (20) is provided with at least one weakening structure (50), which corresponds to the connecting component (40). The weakening structure (50) is provided at the connection position between the corresponding connecting component (40) and the flange structure (20) to weaken the structural connection strength between the corresponding connecting component (40) and the flange structure (20).

6. The explosion-proof enclosure according to claim 5, characterized in that, The connection component (40) includes: A press-fit nut (41) is press-fitted onto the flange structure (20); Bolts (42) are threaded through the cover plate (30) and connected to the press-fit nut (41); The weakening structure (50) is arranged around the rivet nut (41) of the corresponding connecting assembly (40).

7. The explosion-proof enclosure according to claim 6, characterized in that, The weakening structure (50) consists of at least two weakening grooves, all of which are circumferentially spaced around the corresponding press-fit nut (41).

8. The explosion-proof enclosure according to claim 7, characterized in that, There are three weakening grooves, each of which is arc-shaped, and the three weakening grooves are evenly spaced around the corresponding press-fit nut (41) in the circumference.

9. The explosion-proof enclosure according to claim 7, characterized in that, The flange structure (20) has a first surface (21) facing the cover plate (30) and a second surface (22) facing away from the cover plate (30), and the rivet nut (41) is riveted on the second surface (22); The cover plate (30) has an inner surface (31) facing the housing (10), the inner surface (31) is formed with a plurality of abutting protrusions (311) that abut against the first surface (21), all the abutting protrusions (311) are provided in a one-to-one correspondence with all the connecting components (40), and at least one of the abutting protrusions (311) covers the weakening structure (50).

10. A power electronic device, characterized in that, include: An explosion-proof enclosure and a power electronic equipment body disposed within the explosion-proof enclosure; wherein the explosion-proof enclosure is an explosion-proof enclosure according to any one of claims 1 to 9.

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