A housing and power electronic device

Abstract

The application relates to a shell and a power electronic device, and relates to the technical field of power electronic device safety protection.The shell comprises a box body and a box cover, the box body and the box cover are connected through a fixing mechanism to form a closed cavity, the box body has a box body turn-up extending along the circumference of the box body, the box body turn-up comprises a plurality of first turn-ups arranged in a first direction and a plurality of second turn-ups arranged in a second direction; the fixing mechanism comprises a reinforcing fixing unit and a blast venting fixing unit, at least one of the first turn-ups is provided with the reinforcing fixing unit, and at least one of the second turn-ups is provided with the blast venting fixing unit.The application is arranged through function partition, a clear blast venting and safety guarantee path is preset in the structure, the box cover is opened on the directional blast venting side to release pressure when explosion occurs, and meanwhile, the overall fixed side remains connected, so that the blast venting efficiency and overall safety are considered.

Description

Technical Field

[0001] This application relates to the field of safety protection technology for power electronic equipment, and in particular to a housing and power electronic equipment. Background Technology

[0002] Outdoor power electronic equipment, such as photovoltaic inverters and energy storage converters, typically contains energy storage components such as large-capacity capacitors. When the equipment malfunctions or experiences an internal short circuit, these capacitors may explode due to the instantaneous release of energy, generating extremely high transient impact pressure inside the sealed enclosure. If this pressure cannot be effectively dissipated, the enclosure cover may be blown off by the enormous impact, posing a serious safety threat to personnel in the vicinity of the equipment.

[0003] In existing technologies, a common protective measure is to create structural weaknesses at the connection between the lid and the body of the enclosure, such as using low-strength fasteners or locally thinning the flange at the connection. This approach aims to cause these weak points to fail (or be destroyed) first when internal pressure increases, thus creating a pressure relief channel. However, because the weak points and high-strength connection points are randomly distributed around the enclosure circumference, the release path of the explosive impact force is random, often resulting in insufficient opening of the pressure relief channel and low pressure relief efficiency. Furthermore, under asymmetrical impact loads, the lid is prone to uncontrollable torsional deformation and structural tearing, causing the lid to detach from the enclosure and become high-speed debris, potentially leading to secondary injuries. Utility Model Content

[0004] In order to solve the problems of insufficient pressure relief and secondary damage caused by the easy flying off of the cover due to the random distribution of pressure relief path in the prior art, this application provides a housing and a power electronic device.

[0005] The housing and power electronic device provided in this application adopt the following technical solution: A housing includes a box body and a box cover, the box body and the box cover being connected by a fixing mechanism to form a closed cavity. The box body has a box body flange extending circumferentially thereon, the box body flange including a plurality of first flanges arranged along a first direction and a plurality of second flanges arranged along a second direction. The fixing mechanism includes a reinforcing fixing unit and an explosion-proof fixing unit, at least one first flange is entirely provided with the reinforcing fixing unit, and at least one second flange is entirely provided with the explosion-proof fixing unit.

[0006] By adopting the above technical solution, the fixed units are arranged according to functional zones, and the explosion relief path is preset in the structure. When an internal explosion occurs, the pressure is preferentially applied to the second flange, which is entirely connected by the explosion relief fixed units, forcing the connection on this side to fail and forming a pressure relief channel, thereby quickly releasing most of the impact energy. Meanwhile, the first flange, which is entirely connected by the reinforced fixed units, always maintains the integrity of the connection and serves as the main force path to firmly hold the cover, ensuring that it will not fly out as a whole. This solution achieves a balance between the reliability of explosion relief and the safety of the enclosure structure in terms of system layout.

[0007] In one specific implementation, the reinforcing fixing unit includes a first fastener and a reinforcing plate. The reinforcing plate is located on the outside of the flange of the housing and fits against its outer wall. The first fastener connects the housing cover, the flange of the housing, and the reinforcing plate.

[0008] By adopting the above technical solution, by setting independent reinforcing plates and clamping the box flange between the box cover and the reinforcing plates, the overall thickness and bearing area of ​​the connection are effectively increased, the high load generated by the explosion impact is dispersed to a larger area, fundamentally avoiding the tearing of the thin-walled box flange due to stress concentration, and significantly improving the connection reliability of the reinforcing and fixing unit.

[0009] In one specific implementation, the first fastener includes a first screw and a first nut. The cover, the flange of the box body, and the reinforcing plate are respectively provided with a first through hole, a second through hole, and a third through hole. After the first screw passes through the first through hole, the second through hole, and the third through hole, it is threadedly connected to the first nut.

[0010] By adopting the above technical solution and using screws and nuts as fasteners, the structure is simple, the connection is reliable, and it is easy to assemble and maintain. The alignment design of the multi-layer through holes ensures that the load is evenly transmitted along the screw axis, so that the connection structure remains stable when subjected to explosive impact.

[0011] In one specific implementation, the first nut has an axially extending perimeter and a radially extending flange face that contacts the reinforcing plate. The perimeter passes through the third through hole of the reinforcing plate and extends into the second through hole of the flange of the housing.

[0012] By adopting the above technical solution, the edge of the first nut passes through the reinforcing plate and extends into the flange of the box body. This edge can effectively resist the bending deformation of the box cover under the impact of an explosion and provide additional shear resistance. At the same time, the contact between the flange face and the reinforcing plate forms a stable pressure-bearing interface, which evenly distributes the force generated by the explosion impact to a larger area of ​​the reinforcing plate, effectively avoiding stress concentration and enhancing overall stability.

[0013] In one specific implementation, the perimeter is interference-fitted with the third through hole of the reinforcing sheet, and the flange face is abutted and limited against the outer wall of the reinforcing sheet.

[0014] By adopting the above technical solution, the interference fit makes the first nut and the reinforcing plate form a fixed component after assembly. This tight fit eliminates the gap between the components and ensures that the connection part will not generate additional impact load due to shaking under the impact of an explosion. The contact limit between the flange face and the outer wall of the reinforcing plate not only provides a clear installation positioning reference, but also enhances the torsional resistance when subjected to complex loads, thereby ensuring the accuracy of the connection position and the overall reliability.

[0015] In one specific implementation, the perimeter is clearance-fitted with the third through hole of the reinforcing sheet, and the flange face is welded and fixed to the outer wall of the reinforcing sheet.

[0016] By adopting the above technical solution, welding fixation provides an extremely robust connection method. The welded connection between the flange face and the reinforcing plate forms a continuous metal bond, which significantly improves the structural integrity and load transfer efficiency of the connection point and ensures that the first nut and the reinforcing plate will not loosen under extreme impact.

[0017] In one specific implementation, the reinforcing plate is also fixedly connected to the flange of the housing by at least one set of auxiliary fasteners.

[0018] By adopting the above technical solution, the auxiliary fasteners additionally fix the reinforcing plate to the flange of the housing, preventing the reinforcing plate from warping or shifting around the first fastener when under force, ensuring a tight fit between the reinforcing plate and the flange of the housing, and making the reinforcement effect more sufficient and reliable.

[0019] In one specific implementation, the reinforcing sheet is provided with at least one flange structure having a rounded transition portion.

[0020] By adopting the above technical solution, the contact and connection area between the reinforcing sheet and the box body is further increased by using the flange structure, thereby improving the structural rigidity; the key rounded transition part eliminates sharp edges and corners, preventing the box body from being cut when the force is concentrated, and protecting the box body structure from damage.

[0021] In one specific implementation, the explosion venting fixing unit includes a second fastener and an explosion venting plate, the explosion venting plate being located between the cover and the flange of the enclosure, and the second fastener connecting the cover, the enclosure, and the explosion venting plate.

[0022] By adopting the above technical solution, the explosion relief disc, as a carefully designed structural weak link, has its structural strength configured to be much lower than that of the reinforcing fixing unit. During an explosion, this part will be the first to yield, fracture, or detach, thereby forming the expected pressure relief gap between the cover and the box body, achieving precise control of the explosion relief point, and ensuring that the explosion relief process is orderly and controllable.

[0023] In one specific implementation, the second fastener includes a second screw and a second nut, wherein the second screw passes through the cover, the flange of the housing, and the explosion relief disc, and is threadedly connected to the second nut.

[0024] By adopting the above technical solution, this connection method integrates the explosion relief plate into the force transmission path; when the explosion pressure reaches the threshold, the failure of the explosion relief plate will directly lead to the loosening or disintegration of the fastening connection at that point, thereby realizing the partial opening of the box cover. The structural principle is clear and the operation is reliable.

[0025] In one specific implementation, the explosion relief disc is an independent component and is connected to the flange of the housing by a fastener.

[0026] By adopting the above technical solutions, the explosion relief disc, as an independent component, can have its material, thickness, and other parameters flexibly designed and precisely controlled, thereby accurately setting the explosion relief pressure threshold; it is also easy to replace after damage, reducing maintenance costs.

[0027] In one specific feasible implementation, the explosion relief plate is integrally formed with the flange of the housing.

[0028] By adopting the above technical solution, the integrated structure directly integrates the explosion venting function into the flange of the enclosure, which reduces the number of independent parts and assembly steps, lowers manufacturing costs and supply chain complexity, and avoids potential risks such as leakage or strength dispersion that may be introduced by additional connection points through the integrity of the structure, thereby improving the integration and inherent reliability of the explosion venting structure.

[0029] In one specific implementation, the reinforcing fixing unit and / or the explosion venting fixing unit further includes a first gasket, which is sleeved on the first fastener and / or the second fastener and located between the first fastener and the box cover and / or between the second fastener and the box cover.

[0030] By adopting the above technical solution, the first gasket raises the force-bearing points of the first and second fasteners, increases the lever arm, and enables the first and second fasteners to generate greater preload when locked. At the same time, it provides space for other gaskets to be accommodated below, thus optimizing the spatial layout and force transmission path of the overall connection structure.

[0031] In one specific implementation, the reinforcing fixing unit and / or the explosion venting fixing unit further includes a second gasket, which is sleeved on the first fastener and / or the second fastener and located between the first gasket and the box cover.

[0032] By adopting the above technical solution, the second gasket is located in the gap between the first gasket and the lid, serving as an intermediate component for force transmission. It evenly distributes the clamping force of the first gasket to a larger contact area of ​​the lid, effectively preventing the lid from undergoing plastic deformation or crushing due to excessive pressure in some areas, thereby protecting the lid structure.

[0033] In one specific implementation, the reinforcing fixing unit and / or the explosion venting fixing unit further includes a third gasket, which is disposed between the first gasket and the box cover.

[0034] By adopting the above technical solution, the third gasket acts as a physical barrier, effectively preventing the metal first gasket from scratching the surface of the box cover during installation and vibration, thus maintaining the integrity of the product's appearance. Its properties as a non-metallic elastic material not only fill the assembly gaps, providing sealing and vibration damping, but also provide a small amount of buffer deformation during explosive impacts, assisting in energy absorption.

[0035] A power electronic device includes a housing as described in any of the preceding claims.

[0036] By adopting the above technical solution, the housing can be applied to power electronic equipment (such as inverters), which can significantly improve the safety of the equipment under internal failure and explosion conditions, effectively prevent extreme dangerous situations such as housing explosion or cover flying off, protect personal and equipment safety, and is particularly suitable for outdoor and other scenarios with high reliability requirements.

[0037] In summary, the beneficial technical effects of this application are as follows: Through an innovative systematic functional zoning design, the reinforcing and fixing units are concentrated on at least one first flange, and the explosion-proof fixing units are concentrated on at least one second flange, thus pre-setting clear explosion-proof and safety protection paths in the structure; when an internal explosion occurs, the explosion-proof side can quickly form a controllable pressure relief channel, efficiently releasing most of the impact energy; while the reinforcing side, through a composite sandwich structure, nuts with surrounding edges, and auxiliary fixing and other reinforcement designs, always maintains the integrity of the connection, firmly constraining the box cover like a sturdy hinge, ensuring that it will never fly out as a whole, realizing the orderly and controllable explosion-proof process and the safety and reliability of the box structure; Furthermore, the collaborative design of each functional component further optimizes the overall performance. The first gasket and the cover fit together to avoid rigid shearing, the second gasket achieves uniform pressure distribution, and the third gasket provides surface protection and buffer sealing. The explosion relief plate, as an independent component or an integrated weak point, ensures precise control of the explosion relief threshold while also taking into account ease of maintenance and cost-effectiveness. This multi-level, systematic solution significantly improves the safety level of the equipment under explosive conditions without excessively increasing weight and cost, and is particularly suitable for outdoor high-power power electronic equipment with extremely high reliability requirements. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the shell structure according to an embodiment of this application.

[0039] Figure 2 This is a structural diagram used to demonstrate the flange and fixing mechanism of the display case.

[0040] Figure 3 It is a sectional view used to show the reinforced fixing unit.

[0041] Figure 4 yes Figure 3 Enlarged view of section A.

[0042] Figure 5 It is a sectional view used to show the fixed mechanism.

[0043] Figure 6 yes Figure 5 Enlarged view of section B in the middle.

[0044] Figure 7 It is a cross-sectional view used to show the explosion venting fixing unit.

[0045] Figure 8 yes Figure 7 Enlarged view of section C.

[0046] Figure 9 This is a schematic diagram illustrating the structure of the reinforcing plate and the first nut in Embodiment 2.

[0047] Figure 10 This is a schematic diagram illustrating the structure of the explosion relief disc and the flange of the housing in Embodiment 2.

[0048] Explanation of reference numerals in the attached drawings: 1. Box body; 2. Box cover; 21. First through hole; 22. Second convex bulge; 3. Third gasket; 4. Box body flange; 41. First flange; 42. Second flange; 43. Second through hole; 5. Reinforcing fixing unit; 51. First fastener; 52. Reinforcing piece; 521. Third through hole; 522. Flanged structure; 523. Arc transition part; 53. First screw; 54. First nut; 541. Edge; 542. Flange face; 6. Explosion relief fixing unit; 61. Second fastener; 62. Explosion relief piece; 621. Fourth through hole; 63. Second screw; 64. Second nut; 7. Auxiliary fastener; 8. Fixing component; 9. First gasket; 91. First convex bulge; 10. Second gasket. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0050] Example 1 This application discloses a housing and a power electronic device. The housing of this embodiment is designed for outdoor high-power power electronic devices, providing safety protection for easily explosive components such as capacitors and power semiconductor modules inside. While maintaining conventional protective performance, the housing solves the problem of safe pressure relief in the event of an internal explosion, and can be widely used in fields with extremely high safety requirements such as photovoltaic inverters, energy storage converters, and battery packs.

[0051] Reference Figure 1 and Figure 2 The housing mainly includes a box body 1, a box cover 2, and a fixing mechanism connecting the two; the box body 1 and the box cover 2 are connected by the fixing mechanism to form a closed cavity for accommodating electronic components.

[0052] The top edge of the box 1 extends horizontally outward along its circumference to form a box flange 4. In this embodiment, the shape of the box 1 can be rectangular, square, polygonal or other shapes, which are not limited here. In this embodiment, a rectangular box 1 is used as an example. According to the direction of the side wall of the box 1, the box flange 4 is classified: the flange extending along the first direction (e.g., the length direction Y of the box 1) is called the first flange 41, and the flange extending along the second direction (e.g., the width direction X of the box 1) is called the second flange 42.

[0053] The system of fixing mechanisms is designed with functional zoning. The fixing mechanisms are not composed of a single type of connection point, but are divided into reinforced fixing units 5 and explosion-proof fixing units 6 with different functions. The arrangement rules are as follows: reinforced fixing units 5 are set on the entire extension area of ​​at least one first flange 41 (e.g., either of the two parallel long sides); at the same time, explosion-proof fixing units 6 are set on the entire extension area of ​​at least one second flange 42 (e.g., either of the two parallel short sides). This layout with differentiated functions on long and short sides pre-determines clear explosion-proof and safety protection paths in terms of physical structure, laying the foundation for controllable explosion venting.

[0054] In this embodiment, the entire extension area of ​​either of the two parallel long sides is provided with reinforced fixing units 5, while the other long side may be provided with a mixture of explosion-proof fixing units 6 and reinforced fixing units 5. In other embodiments, the other long side may also be entirely provided with explosion-proof fixing units 6. Meanwhile, the entire extension area of ​​either of the two parallel short sides is provided with explosion-proof fixing units 6, while the other short side is entirely provided with reinforced fixing units 5. This arrangement combining symmetrical and asymmetrical elements can be optimized and adjusted according to the explosion risk distribution of specific equipment to achieve the best safety protection effect.

[0055] Reference Figure 3-6 The reinforcing fixing unit 5 includes a first fastener 51 and a reinforcing plate 52. The reinforcing plate 52 is preferably made of high-strength steel plate (such as Q345B), and its material strength is significantly higher than that of ordinary cold-rolled steel plate (such as SPCC) commonly used in the box body 1. The reinforcing plate 52 is attached and fixed to the bottom (i.e. the outer side) of the box body flange 4.

[0056] Reference Figure 4 and Figure 6 The first fastener 51 includes a first screw 53 and a first nut 54. The cover 2, the body flange 4, and the reinforcing plate 52 are respectively provided with a first through hole 21, a second through hole 43, and a third through hole 521. During assembly, the first screw 53 passes through the first through hole 21 on the cover 2, the second through hole 43 on the body flange 4, and the third through hole 521 on the reinforcing plate 52 in sequence, and finally connects with the first nut 54 by thread, thereby tightly connecting the cover 2, the body flange 4, and the reinforcing plate 52 into a whole.

[0057] By setting an independent reinforcing plate 52, the thin box flange 4 is sandwiched between the box cover 2 and the high-strength reinforcing plate 52, forming an efficient composite sandwich structure; increasing the overall thickness and effective pressure-bearing area of ​​the connection; when the high load generated by the explosion impact is transmitted to this part through the screw, the load is quickly dispersed to a larger area of ​​the reinforcing plate 52, so that the pressure acting on the box flange 4 body is greatly reduced, thereby avoiding the box flange 4 of the thin-walled sheet metal structure from tearing or pulling off due to stress concentration, and significantly improving the absolute reliability and durability of this key connection point.

[0058] In this embodiment, the first nut 54 has a perimeter 541 extending axially and a flange face 542 extending radially. During assembly, the flange face 542 contacts the outer surface of the reinforcing plate 52, while the perimeter 541 passes through the third through hole 521 of the reinforcing plate 52 and further extends into the second through hole 43 of the box body flange 4. This design makes the perimeter 541 an embedded support and guide structure, which can not only resist the upward bending deformation of the box cover 2 under the impact of the explosion and prevent the box cover 2 from bulging excessively, but also provide additional shear resistance for the entire reinforcing fixing unit 5, effectively avoiding excessive lateral shear force on the first screw 53. At the same time, the contact between the flange face 542 and the reinforcing plate 52 forms a stable pressure-bearing interface, which evenly distributes the force generated by the explosion impact to a larger area of ​​the reinforcing plate 52, effectively avoiding stress concentration and further enhancing the overall stability.

[0059] In this embodiment, the perimeter 541 of the first nut 54 and the third through hole 521 of the reinforcing plate 52 are designed to be interference fit; so that the first nut 54 and the reinforcing plate 52 form a fixed component after pressing. This tight fit eliminates the gap between the components and ensures that when subjected to explosive impact, the connection part will not generate additional impact load due to slight shaking, thereby ensuring the accuracy of the connection position and the overall reliability under dynamic conditions. Furthermore, the flange face 542 of the first nut 54 is in contact with and limited by the outer wall of the reinforcing plate 52; thereby enhancing the torsional resistance of the first nut 54 under complex loads, thus ensuring the accuracy of the connection position and the overall reliability.

[0060] The reinforcing plate 52 is also additionally anchored to the side wall of the housing 1 by at least one set of auxiliary fasteners 7 (e.g., screws, nuts); this ensures that the reinforcing plate 52 fits tightly against the side wall of the housing 1, forming an integral load-bearing frame, and more effectively transferring the explosive load to the robust reinforcing plate 52.

[0061] Meanwhile, the reinforcing sheet 52 is provided with at least one flange structure 522 with a rounded transition portion 523; in this embodiment, the reinforcing sheet 52 is bent downward to form two flange structures 522, one of which is located near the housing flange 4 and the other is located near the outer wall of the housing 1; the flange structure 522 further increases the connection rigidity and area, and the rounded transition portion 523 of the flange structure 522 can eliminate sharp edges and prevent the sharp edges of the reinforcing sheet 52 from cutting the plates of the housing 1 and the housing flange 4 when subjected to huge explosive pulling force, thereby protecting the main structure of the shell from being damaged.

[0062] Reference Figure 7 and Figure 8 The explosion relief fixing unit 6 is an actuator that enables effective pressure relief. It mainly includes a second fastener 61 and an explosion relief plate 62. The explosion relief plate 62 is disposed between the cover 2 and the flange 4 of the box body. The second fastener 61 connects the cover 2, the explosion relief plate 62 and the flange 4 of the box body in sequence.

[0063] Specifically, the second fastener 61 includes a second screw 63 and a second nut 64. In this embodiment, the explosion relief plate 62 is provided with a fourth through hole 621, which is aligned with the second through hole 43 on the flange of the box body. The second screw 63 passes through the first through hole 21 on the box cover 2 and the fourth through hole 621 on the explosion relief plate 62 (the second through hole 43 on the flange of the box body) in sequence, and then is threadedly connected to the second nut 64.

[0064] The explosion relief disc 62 is a key structural weak link in achieving the controllable explosion relief function. Its structural strength is configured to be much lower than that of the reinforcing fixing unit 5. This can be achieved by selecting a material with lower strength (such as aluminum, specific plastics, or annealed thin steel sheets) or by designing its geometry (such as reducing its thickness, opening stress concentration grooves, or weight reduction holes).

[0065] Under normal operating conditions, the explosion relief disc 62 provides sufficient connection strength to keep the housing 1 sealed. Once an internal explosion occurs, the pressure is rapidly transmitted to this point through the cover 2. The explosion relief disc 62 will yield, break, or be pulled off the fixed point due to insufficient strength, thus forming the expected pressure relief gap between the cover 2 and the housing 1. This design enables accurate control and directional opening of the explosion relief point, ensuring that the explosion relief process is orderly and controllable, the energy release path is clear, and avoiding the risk of overall and unpredictable explosion of the housing 1 due to pressure having nowhere to be released.

[0066] In this embodiment, the explosion relief disc 62 is an independent component that can be connected to the housing flange 4 by fasteners such as rivets and screws 8. As an independent part, the explosion relief disc 62's material, thickness, heat treatment status, and other parameters can be flexibly designed and controlled, thereby enabling the explosion relief pressure threshold to be set and verified through calculation and experimentation. Furthermore, after regular equipment maintenance or explosion relief operation, the damaged explosion relief disc 62 can be easily disassembled and replaced, greatly reducing equipment maintenance costs and time, and giving the product recoverable safety performance.

[0067] Reference Figure 4 and Figure 8 To optimize stress distribution and protect the cover 2, the reinforcing fixing unit 5 and / or the explosion-proof fixing unit 6 further include a first gasket 9. The reinforcing fixing unit 5 must include the first gasket 9, and the explosion-proof fixing unit 6 may or may not include the first gasket 9. In this embodiment, the explosion-proof fixing unit 6 includes the first gasket 9. The first gasket 9 includes, but is not limited to, a boss gasket. The first gasket 9 is sleeved on the first fastener 51 (first screw 53) and / or the second fastener 61 (second screw 63), and is located between the first fastener 51 (the head of the first screw 53) and the cover 2 and / or between the second fastener 61 (the head of the second screw 63) and the cover 2.

[0068] As one implementation, the first gasket 9 is provided with a first protrusion 91 protruding towards the lid 2, and the lid 2 is provided with a second protrusion 22 protruding downward at the corresponding position; a gap is left between the first protrusion 91 and the second protrusion 22; this gap allows the lid 2 to have a small amount of deformation space under the impact of an explosion, which plays a buffering role and can guide the lid 2 to deform and open in the expected direction, while avoiding the huge shear force generated by the hard contact between the first gasket 9 and the lid 2, thereby protecting the first fastener 51 and the second fastener 61.

[0069] The reinforcing fixing unit 5 and / or the explosion venting fixing unit 6 further include a second gasket 10. The reinforcing fixing unit 5 must include the second gasket 10, and the explosion venting fixing unit 6 may or may not include the second gasket 10. In this embodiment, the explosion venting fixing unit 6 includes the second gasket 10. The second gasket 10 includes, but is not limited to, a support gasket. The second gasket 10 is sleeved on the first fastener 51 (first screw 53) and / or the second fastener 61 (second screw 63), and when the first protrusion 91 and the second protrusion 22 are provided, it can be located in the gap between the first protrusion 91 and the second protrusion 22. The second gasket 10 acts as a rigid force distribution medium, distributing the concentrated clamping force transmitted from the first gasket 9 through the first protrusion 91 evenly to a larger contact area at the bottom of the second protrusion 22 of the cover 2. This effectively prevents the cover 2 from undergoing plastic deformation or crushing due to excessive pressure in certain areas, thus ensuring a seal while protecting the structural integrity of the cover 2. During an explosive impact, the second gasket 10 ensures that the impact force is efficiently transmitted from the cover 2 to the first gasket 9. Its own presence also optimizes the force distribution and works in conjunction with the gap to guide the cover 2 to produce the expected and controllable upward bending deformation.

[0070] The reinforcing fixing unit 5 and / or the explosion venting fixing unit 6 also include a third gasket 3. The reinforcing fixing unit 5 must include the third gasket 3, and the explosion venting fixing unit 6 may or may not include the third gasket 3. In this embodiment, the explosion venting fixing unit 6 includes the third gasket 3. The third gasket 3 includes, but is not limited to, an anti-scratch gasket. The third gasket 3 is disposed between the first gasket 9 and the box cover 2 and is attached to the first gasket 9 and the box cover 2. In this embodiment, the third gasket 3 is made of a non-metallic elastic material (such as silicone rubber, nylon, or polyurethane). The third gasket 3 acts as a soft physical barrier, preventing the metal first gasket 9 from scratching the surface coating or treatment layer of the cover 2 during installation and long-term vibration. At the same time, its elastic properties can fill the micro-assembly gap between the first gasket 9 and the cover 2, playing a sealing role and having a certain vibration damping effect. Furthermore, at the moment of explosive impact, the elastic gasket can provide a small amount of buffer deformation to help absorb and dissipate some of the impact energy.

[0071] The implementation principle of this application embodiment is as follows: When an explosion occurs inside the shell due to the failure of components such as capacitors, the rapidly increasing gas pressure will act evenly on the inner surface of the cover 2; since the second flange 42, which is connected by the explosion relief fixing unit 6, is a controllable weak link designed in the entire connection loop, the internal pressure will preferentially force the connection structure on this side to fail, causing the cover 2 and the box body 1 to partially separate on this side, forming a narrow pressure relief channel, thereby quickly and orderly releasing most of the impact energy; At the same time, the first flange 41, which is connected by the reinforced fixing unit 5, serves as a high-strength safety path designed to maintain the integrity of the connection throughout the explosion process, like a sturdy hinge. While the explosion venting side opens, it firmly restrains the movement trajectory of the box cover 2, ensuring that it only produces controllable rotational deformation and will never fly out as a whole.

[0072] The coordinated operation of various functional components further optimizes the entire explosion relief process. The gap design between the first gasket 9 and the cover 2 effectively avoids rigid shear damage; the second gasket 10 ensures the uniform distribution of impact force; and the third gasket 3 provides an additional buffering effect while providing a seal. This multi-layered and systematic protection design achieves both efficient pressure relief and absolute safety when an explosion occurs inside the casing.

[0073] When this innovative housing is applied to power electronic equipment such as photovoltaic inverters and energy storage converters, it can significantly improve the safety performance of the equipment under internal fault explosion conditions; effectively prevent extreme dangerous situations such as housing 1 bursting or housing cover 2 flying off, minimizing potential equipment loss and personal injury risks; through controlled explosion venting paths, it guides the high-temperature electric arc and combustion products to be discharged in a safe direction, avoiding the occurrence of secondary hazards; at the same time, the modular design enables the equipment to quickly resume operation after explosion venting, greatly reducing maintenance costs.

[0074] Example 2 Reference Figure 9 The difference between this embodiment and Embodiment 1 is that the fixing method of the reinforcing plate 52 and the first nut 54 is as follows: the perimeter 541 and the third through hole 521 are in clearance fit, and the flange surface 542 of the first nut 54 and the outer surface of the reinforcing plate 52 are fixed by welding (such as resistance welding or brazing).

[0075] The combination of clearance fit and welding provides an extremely robust, near-integral mechanical connection. The clearance fit facilitates initial assembly and positioning, while the subsequent welding process fundamentally eliminates the possibility of relative displacement or loosening between the first nut 54 and the reinforcing plate 52 in any direction. This connection method can withstand higher fatigue loads and impacts, ensuring that the critical connection node maintains absolute integrity even under extreme and repeated impact loads.

[0076] Example 3 Reference Figure 10 The difference between this embodiment and the first embodiment is that the explosion relief piece 62 and the box flange 4 are integrally formed; the explosion relief piece 62 is a part of the box flange 4, and through the overall design of materials and structure, it becomes a structural weak link on the box flange 4.

[0077] This integrated structure directly integrates the explosion venting function into the enclosure flange 4, eliminating the need to manufacture and assemble separate explosion venting components. This design reduces the number of parts and assembly steps, lowers manufacturing costs and supply chain complexity, and avoids leakage risks or strength dispersion issues that may be introduced by additional connection points (such as rivets and screw holes) through the integrity of the structure. Compared with a split structure, there is no risk of assembly gaps or connection failures between the integrally formed explosion venting 62 and the enclosure flange 4, thereby improving the integration of the explosion venting structure and its inherent reliability under explosive impact.

[0078] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A housing, characterized in that: The device includes a housing and a lid, which are connected by a fixing mechanism to form a closed cavity. The housing has a flange extending circumferentially thereon, which includes a plurality of first flanges arranged along a first direction and a plurality of second flanges arranged along a second direction. The fixing mechanism includes a reinforcing fixing unit and an explosion-proof fixing unit, wherein at least one first flange is entirely provided with the reinforcing fixing unit, and at least one second flange is entirely provided with the explosion-proof fixing unit.

2. The housing according to claim 1, characterized in that: The reinforcing and fixing unit includes a first fastener and a reinforcing plate. The reinforcing plate is located on the outside of the flange of the box body and fits against its outer wall. The first fastener connects the box cover, the flange of the box body, and the reinforcing plate.

3. The housing according to claim 2, characterized in that: The first fastener includes a first screw and a first nut. The cover, the flange of the box body, and the reinforcing plate are respectively provided with a first through hole, a second through hole, and a third through hole. After the first screw passes through the first through hole, the second through hole, and the third through hole, it is threadedly connected to the first nut.

4. The housing according to claim 3, characterized in that: The first nut has a perimeter extending along its axial direction and a flange extending radially. The flange contacts the reinforcing plate, and the perimeter passes through the third through hole of the reinforcing plate and extends into the second through hole of the flange of the housing.

5. The housing according to claim 4, characterized in that: The surrounding edge is interference-fitted with the third through hole of the reinforcing sheet, and the flange face is in contact with and limited by the outer wall of the reinforcing sheet.

6. The housing according to claim 4, characterized in that: The edging is clearance-fitted with the third through hole of the reinforcing sheet, and the flange face is welded and fixed to the outer wall of the reinforcing sheet.

7. The housing according to claim 2, characterized in that: The reinforcing plate is also fixedly connected to the flange of the housing by at least one set of auxiliary fasteners.

8. The housing according to claim 2, characterized in that: The reinforcing sheet has at least one flange structure with a rounded transition portion.

9. The housing according to claim 2, characterized in that: The explosion relief fixing unit includes a second fastener and an explosion relief plate. The explosion relief plate is located between the cover and the flange of the box body. The second fastener connects the cover, the box body and the explosion relief plate.

10. The housing according to claim 9, characterized in that: The second fastener includes a second screw and a second nut. The second screw passes through the cover, the flange of the housing, and the explosion relief disc, and is threadedly connected to the second nut.

11. The housing according to claim 9, characterized in that: The explosion relief plate is an independent component and is connected to the flange of the housing by a fastener.

12. The housing according to claim 9, characterized in that: The explosion relief plate is integrally formed with the flange of the housing.

13. The housing according to claim 9, characterized in that: The reinforcing fixing unit and / or the explosion venting fixing unit further includes a first gasket, which is sleeved on the first fastener and / or the second fastener and located between the first fastener and the box cover and / or between the second fastener and the box cover.

14. The housing according to claim 13, characterized in that: The reinforcing fixing unit and / or the explosion venting fixing unit further includes a second gasket, which is sleeved on the first fastener and / or the second fastener and located between the first gasket and the box cover.

15. The housing according to claim 13, characterized in that: The reinforcing fixing unit and / or the explosion venting fixing unit further includes a third gasket, which is disposed between the first gasket and the box cover.

16. A power electronic device, characterized in that: Includes the housing as described in any one of claims 1-15.

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