Cabinet assembly and photovoltaic inverter

Abstract

This application provides a housing assembly and a photovoltaic inverter. The housing assembly includes: a housing having a cavity and a retaining edge at the cavity opening; a cover plate overlapping the retaining edge and covering the cavity, the cover plate having a first side and a second side disposed opposite to each other; a first screw-on assembly, the first side being fixedly connected to the retaining edge; a second screw-on assembly, the second side being fixedly connected to the retaining edge; the connection strength between the first screw-on assembly and the retaining edge is greater than the connection strength between the second screw-on assembly and the retaining edge; when the internal pressure of the housing increases, the second screw-on assembly gradually disengages from the retaining edge, so that the second side is at least partially moved away from the housing and forms a vent gap. Gas inside the housing can be discharged to the outside through the vent gap, quickly releasing internal pressure, achieving rapid pressure relief and preventing explosion.

Description

Technical Field

[0001] This application relates to the field of electrical equipment enclosure technology, and in particular to an enclosure assembly and a photovoltaic inverter. Background Technology

[0002] Currently, photovoltaic inverters, designed for outdoor environments, typically require high levels of protection, including airtightness and waterproofing, to prevent damage to internal electronic components from external environmental factors. However, when inverters are overused, the electrolytic capacitors inside may generate large amounts of gas due to short circuits or excessive internal temperatures, increasing the internal pressure. When the gas concentration reaches the explosion threshold and encounters an ignition source, or when the gas pressure reaches a certain high-pressure threshold, a deflagration or explosion may occur. Because the inverter is sealed, the high pressure generated during an explosion cannot be released in time, potentially causing the equipment casing to be destroyed and blown away, resulting in an explosion and posing a safety hazard. Utility Model Content

[0003] In view of the above, it is necessary to provide a housing module and a photovoltaic inverter to solve the above-mentioned defects.

[0004] This application provides a housing assembly, comprising: a housing having a receiving cavity and a retaining edge provided at the opening of the receiving cavity; a cover plate overlapping the retaining edge and covering the receiving cavity, the cover plate having a first side and a second side disposed opposite to each other; a first screw-on assembly, the first side being fixedly connected to the retaining edge by the first screw-on assembly; a second screw-on assembly, the second side being fixedly connected to the retaining edge by the second screw-on assembly; the connection strength between the first screw-on assembly and the retaining edge is greater than the connection strength between the second screw-on assembly and the retaining edge; when the internal pressure of the housing increases, the second screw-on assembly gradually disengages from the retaining edge, so that the second side is at least partially moved away from the housing and forms a venting gap.

[0005] In some embodiments, the contact area between the first screw assembly and the flange is greater than the contact area between the second screw assembly and the flange.

[0006] In some embodiments, the first screw assembly includes a first mounting nut, a first mounting screw, and a locking nut, wherein the locking nut abuts against the side of the flange away from the cover plate; the outer side of the first mounting nut is provided with a threaded surface, the first mounting nut passes through the flange and is threadedly connected to the locking nut; the first mounting screw passes through the first side and is threadedly connected to the first mounting nut.

[0007] In some embodiments, the cover plate is provided with a first washer, which is clamped between the first side and the flange, and a first mounting screw passes through the first washer.

[0008] In some embodiments, the second screw assembly includes a second mounting nut and a second mounting screw. The outer side of the second mounting nut is provided with a protruding edge, wherein the second mounting nut passes through and is fixed to the retaining edge, and the protruding edge abuts against the side of the retaining edge away from the second side; the second mounting screw passes through the second side and is threaded into the second mounting nut.

[0009] In some embodiments, the first area of ​​the locking nut abutting against the retaining edge is larger than the second area of ​​the convex edge abutting against the retaining edge.

[0010] In some embodiments, the housing is provided with a crossbeam extending in a first direction, the crossbeam being suspended at the opening of the accommodating cavity, and the two ends of the crossbeam being fixed to the housing respectively; the cover plate includes a first panel and a second panel distributed in a second direction, the first panel covering the area of ​​the accommodating cavity near one side of the crossbeam, and the second panel covering the area of ​​the accommodating cavity near the other side of the crossbeam, the first direction being perpendicular to the second direction.

[0011] In some embodiments, the two sides of the first panel in a first direction are a first side and a second side, the first panel is fixedly connected to the crossbeam, a first screw assembly is disposed on the first side away from the crossbeam, and a second screw assembly is disposed on the second side away from the crossbeam.

[0012] In some embodiments, the two sides of the second panel in the first direction are a first side and a second side, respectively. The second panel is provided with a pin that is inserted into the first panel. A first screw assembly is provided on the second panel at the part of the first side away from the crossbeam, and a second screw assembly is provided on the second side of the second panel at the part of the second side away from the crossbeam.

[0013] A second aspect of this application provides a photovoltaic inverter, including electronic components and a housing assembly as described in the first aspect, wherein the electronic components are disposed within the housing assembly.

[0014] With the enclosure assembly and photovoltaic inverter provided in this application, when the internal pressure of the enclosure increases, the second screw assembly can gradually detach from the side flange due to the air pressure impacting the cover plate. Because the connection strength of the second screw assembly is relatively weak, the second screw assembly can then detach from the side flange under the pressure. When the high pressure inside the enclosure reaches a specified threshold, the second screw assembly cannot maintain the fixation between the second side and the side flange, causing the second side to at least partially move away from the enclosure. This creates a ventilation gap between the second side and the enclosure, allowing the gas inside the enclosure to escape and quickly release the internal pressure, achieving rapid pressure relief and preventing an explosion. Simultaneously, the connection strength of the first screw assembly is relatively strong, ensuring that the first side can still maintain connection with the side flange through the first screw assembly, keeping the cover plate intact on the enclosure and preventing it from being blown away, thus improving safety performance. Attached Figure Description

[0015] Figure 1A schematic diagram of the structure of the housing assembly provided in this application.

[0016] Figure 2 A schematic diagram illustrating the changes in the enclosure assembly provided in this application from normal conditions to rapid depressurization.

[0017] Figure 3 An exploded view of the housing, cover plate, first screw assembly, and second screw assembly provided in this application.

[0018] Figure 4 An exploded view of the housing and the second panel provided in this application.

[0019] Figure 5 An exploded view of the housing, crossbeam, first mounting nut, and second mounting nut provided in this application.

[0020] Figure 6 This is a schematic diagram illustrating the principle of fixing the first screw assembly to the flange provided in this application.

[0021] Figure 7 This is a schematic diagram illustrating the principle of fixing the second screw assembly to the flange provided in this application.

[0022] Explanation of main component symbols

[0023] 100. Enclosure assembly;

[0024] 10. Housing; 11. Receiving cavity; 12. Edge; 121. First mounting hole; 122. Second mounting hole; 13. Vent gap;

[0025] 20. Cover plate; 21. First side; 22. Second side; 23. Third side; 24. Fourth side; 25. First washer; 26. First countersunk hole; 261. First protective sleeve; 27. Second countersunk hole; 271. Second protective sleeve;

[0026] 30. First screwed assembly; 31. First mounting nut; 32. First mounting screw; 33. Locking nut;

[0027] 40. Second screw assembly; 41. Second mounting nut; 411. Protruding edge; 42. Second mounting screw;

[0028] 50. First panel; 51. First stop bar; 52. Connecting piece; 53. Locking screw;

[0029] 60. Second panel; 62. Pin;

[0030] 70. Crossbeam; 71. Baffle; 72. Groove; 73. Fixing screw. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments.

[0032] In the description of the embodiments in this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0033] This application provides a housing module and a photovoltaic inverter, which have the technical effect of improving safety.

[0034] like Figure 1 As shown, this application embodiment first provides a housing assembly 100, which is applied to a photovoltaic inverter. Exemplarily, the photovoltaic inverter includes electronic components and the housing assembly 100. The electronic components are disposed within the housing assembly 100, and the housing assembly 100 protects the electronic components. The electronic components include, but are not limited to, an inverter module, a control module, a battery management module, electronic components (such as electrolytic capacitors), and sensors, and can be specifically configured according to the actual application scenario.

[0035] Please refer to the following: Figure 2 and Figure 3 The housing assembly 100 includes a housing 10, a cover plate 20, a first screw-on assembly 30, and a second screw-on assembly 40. The housing 10 has a receiving cavity 11, and a retaining edge 12 is provided at the opening of the receiving cavity 11. The cover plate 20 overlaps the retaining edge 12 and covers the receiving cavity 11. The cover plate 20 has a first side 21 and a second side 22 disposed opposite to each other, which are the side portions of the cover plate 20 on both sides in a first direction, which is the X direction shown in the figure. The first side 21 is fixedly connected to the retaining edge 12 by the first screw-on assembly 30, and the first side 21 is in close contact with the retaining edge 12. The second side 22 is fixedly connected to the retaining edge 12 by the second screw-on assembly 40, and the second side 22 is in close contact with a baffle 71. Thus, the first side 21 and the second side 22 of the cover plate 20 are respectively fixed and in close contact with the retaining edge 12, so that the cover plate 20 is entirely fixed to the housing 10.

[0036] In this embodiment, the connection strength between the first screw assembly 30 and the flange 12 is greater than the connection strength between the second screw assembly 40 and the flange 12. When the internal pressure of the housing 10 increases, the second screw assembly 40 gradually disengages from the flange 12, so that the second side 22 is at least partially moved away from the housing 10 and forms a ventilation gap 13.

[0037] Under normal circumstances, the first screw assembly 30 and the second screw assembly 40 cooperate to fix the cover plate 20 to the housing 10 as a whole. At this time, the cover plate 20 closes the accommodating cavity 11 to protect the electronic components inside the accommodating cavity 11. When the internal pressure of the housing 10 increases, due to the air pressure impacting the cover plate 20, and because the connection strength of the second screw assembly 40 is relatively weak, the second screw assembly 40 can gradually detach from the retaining edge 12 under the action of air pressure. When the high pressure inside the housing 10 reaches a specified threshold, the second screw assembly 40 can no longer maintain the fixation between the second side 22 and the retaining edge 12, causing the second side 22 to move away from the housing 10 at least partially, forming a venting gap 13 between the second side 22 and the housing 10. The gas inside the housing 10 can be discharged to the outside through the venting gap 13, quickly releasing the internal pressure and achieving the function of rapid pressure relief to prevent explosion.

[0038] On the other hand, since the connection strength of the first screw assembly 30 is relatively strong, the first side 21 can still maintain the connection with the side guard 12 through the first screw assembly 30 during the process of the cover plate 20 being opened by air pressure, so that the cover plate 20 as a whole is still retained on the box 10, preventing the cover plate 20 from being blown away directly, and further improving the safety performance.

[0039] In some embodiments, there is a strength difference between the yield strength of the cover plate 20 and the yield strength of the housing 10. For example, the yield strength of the housing 10 is less than the yield strength of the cover plate 20. The cover plate 20 is die-cast from ADC12 aluminum alloy, and the housing 10 is manufactured from AL5052 aluminum alloy. The standard reference value for the yield strength of ADC12 aluminum alloy is 170 MPa, and the standard reference value for the yield strength of AL5052 aluminum alloy is 70 MPa. Thus, if a pneumatic impact causes the second screw assembly 40 to fail to maintain the fixation between the second side 22 and the flange 12, the portion of the housing 10 closest to the second side 22 is preferentially stretched and deformed, causing the second side 22 to move away from the housing 10 and forming a ventilation gap 13.

[0040] In other embodiments, the yield strength of the housing 10 can also be configured to be greater than the yield strength of the cover plate 20. For example, the cover plate 20 is made of AL5052 aluminum alloy, and the housing 10 is made of ADC12 aluminum alloy. Thus, if a pneumatic impact causes the second screw assembly 40 to fail to maintain the fixation between the second side 22 and the flange 12, the second side 22 of the cover plate 20 will be preferentially stretched open and deformed, causing the second side 22 to move away from the housing 10 and form a ventilation gap 13.

[0041] Please refer to the following: Figure 4 and Figure 5In some embodiments, the cover plate 20 includes a first panel 50 and a second panel 60, which are distributed along a second direction perpendicular to the first direction, which is the Y direction shown in the figure. Both the first panel 50 and the second panel 60 are die-cast from aluminum alloy, and are combined to form an integral cover plate 20. For ease of understanding, the two sides of the first panel 50 in the first direction are defined as first side 21A and second side 22A, respectively; the two sides of the first panel 50 in the second direction are defined as third side 23A and fourth side 24A, respectively; and the first side 21A and the second side 22A are respectively equipped with a first screw assembly 30A and a second screw assembly 40A. Similarly, the two sides of the second panel 60 in the first direction are defined as first side 21B and second side 22B, respectively; the two sides of the second panel 60 in the second direction are defined as third side 23B and fourth side 24B, respectively; and the first side 21B and the second side 22B are respectively equipped with a first screw assembly 30B and a second screw assembly 40B.

[0042] In some embodiments, the housing 10 is provided with a crossbeam 70 extending along a first direction. The crossbeam 70 is suspended at the opening of the accommodating cavity 11, and both ends of the crossbeam 70 are fixed to the housing 10. The crossbeam 70 is located between the fourth side 24A of the first panel 50 and the third side 23B of the second panel 60. The first panel 50 covers the area of ​​the accommodating cavity 11 near one side of the crossbeam 70, and the second panel 60 covers the area of ​​the accommodating cavity 11 near the other side of the crossbeam 70.

[0043] For example, the crossbeam 70 has a first end and a second end. A baffle 71 is provided at the first end of the crossbeam 70, and a fixing screw 73 is disposed on the baffle 71. The baffle 71 extends into the inner side of the cavity 11, and the fixing screw 73 passes through the baffle 71 and is threaded onto the housing 10, so that the first end of the crossbeam 70 is fixed to the housing 10. A recessed groove is provided in the housing 10 near the second end of the crossbeam 70, and the second end of the crossbeam 70 is adapted to be received in the recessed groove and welded to the housing 10. In the assembly process, the first end of the crossbeam 70 can be bolted to the housing 10 first, and then the second end of the crossbeam 70 can be welded to the housing 10, improving assembly efficiency.

[0044] In some embodiments, the first panel 50 is fixedly connected to the crossbeam 70, and the first panel 50 is provided with a first screw assembly 30A on the first side 21A away from the crossbeam 70, and the first panel 50 is provided with a second screw assembly 40A on the second side 22A away from the crossbeam 70.

[0045] For example, the surface of the crossbeam 70 is recessed to form a groove 72. The first panel 50 is provided with a first stop bar 51 on the fourth side 24A. The stop bar is provided with a connecting piece 52 corresponding to the crossbeam 70 along its edge. The connecting piece 52 is provided with a plurality of locking screws 53 along its length. The first stop bar 51 and the connecting piece 52 are received in the groove 72, and the connecting piece 52 overlaps the crossbeam 70. The locking screws 53 pass through the connecting piece 52 and are threaded to the crossbeam 70. In this way, the fourth side 24A of the first panel 50 is bolted to the crossbeam 70, the junction of the first side 21A and the third side 23A is fixed to the side rail 12 by the first screw assembly 30A, and the junction of the second side 22A and the third side 23A is fixed to the side rail 12 by the second screw assembly 40A, so that the first panel 50 is fixed to the housing 10 as a whole.

[0046] In some embodiments, the second panel 60 is provided with a pin 62 that is inserted into the first panel 50, the second panel 60 is provided with a first screw assembly 30B at the part of the first side 21B away from the crossbeam 70, and the second panel 60 is provided with a second screw assembly 40B at the part of the second side 22B away from the crossbeam 70.

[0047] For example, the second panel 60 has a second stop bar (not shown) on its third side 23B, which is opposite to the first stop bar 51. The second stop bar has a plurality of pins 62 arranged along its length. The second stop bar is received within a groove 72, and the second stop bar and the first stop bar 51 are tightly fitted together. The pins 62 pass through the second stop bar in a first direction and are inserted and fixed to the first stop bar 51. Thus, the third side 23B of the second panel 60 is fixed to the crossbeam 70 and the first panel 50, the junction of the first side 21B and the fourth side 24B is fixed to the flange 12 by a first screw assembly 30B, and the junction of the second side 22B and the fourth side 24B is fixed to the flange 12 by a second screw assembly 40B, so that the second panel 60 is entirely fixed to the housing 10.

[0048] It is worth noting that, in the example of this application, the first panel 50 and the second panel 60 can be regarded as an integral cover plate 20. Two sets of the first screw-connecting assembly 30 and the second screw-connecting assembly 40 are each configured. The two sets of first screw-connecting assemblies 30 are located at both ends of the first side 21 of the cover plate 20, and the two sets of second screw-connecting assemblies 40 are located at both ends of the second side 22 of the cover plate 20. In other embodiments, the number and position of the first screw-connecting assembly 30 and the second screw-connecting assembly 40 can be adjusted according to actual needs to achieve directional pressure relief of the housing 10 at a specified location, while adapting to different pressure relief requirements and providing different pressure relief capabilities. This application does not impose any limitations on this.

[0049] In some embodiments, the contact area between the first screw assembly 30 and the flange 12 is greater than the contact area between the second screw assembly 40 and the flange 12, so that the connection strength between the first screw assembly 30 and the flange 12 is greater than the connection strength between the second screw assembly 40 and the flange 12. It is worth noting that in the example of this application, the first screw assembly 30 and the second screw assembly 40 utilize different contact areas to create a difference in their connection strength. In other embodiments, the first screw assembly 30 and the second screw assembly 40 can also utilize different numbers, different materials, etc., to create a difference in connection strength; this application does not impose any limitations on this.

[0050] Please refer to the following: Figure 6 In some embodiments, the first screwed assembly 30 includes a first mounting nut 31, a first mounting screw 32, and a locking nut 33. The locking nut 33 abuts against the side of the retaining edge 12 away from the cover plate 20. The outer side of the first mounting nut 31 has a threaded surface, and the first mounting nut 31 passes through the retaining edge 12 and is threaded into the locking nut 33. The first mounting screw 32 passes through the first side 21 and is threaded into the first mounting nut 31. Thus, the first mounting nut 31, the first mounting screw 32, and the locking nut 33 cooperate to clamp and fix the cover plate 20 and the retaining edge 12 between the first mounting screw 32 and the locking nut 33, and the locking nut 33 reinforces the first mounting nut 31 to improve the overall connection strength of the first screwed assembly 30.

[0051] Specifically, the cover plate 20 is provided with a first washer 25, which is clamped between the first side 21 and the retaining edge 12, and the first mounting screw 32 passes through the first washer 25. The first washer 25 plays a sealing and cushioning role between the cover plate 20 and the retaining edge 12, preventing moisture from the external environment from entering the interior of the box 10 and reducing mechanical wear between the cover plate 20 and the retaining edge 12.

[0052] Specifically, the cover plate 20 is provided with a first protective sleeve 261, and a first mounting screw 32 passes through the first protective sleeve 261 and the cover plate 20, and is threaded into the first mounting nut 31. The first protective sleeve 261 protects the cover plate 20 and reduces mechanical wear, while also providing a certain preload between the first mounting screw 32 and the cover plate 20, thereby improving the connection strength of the first mounting screw 32.

[0053] For example, the first mounting nut 31 extends along a third direction, which is the Z direction shown in the figure. A raised edge is provided on the outer side of the first mounting nut 31, and a first mounting hole 121 is provided on the retaining edge 12. The first mounting nut 31 is inserted and fixed into the first mounting hole 121 of the retaining edge 12 by a press-fitting process, with the raised edge embedded and fixed to the retaining edge 12. The head end of the first mounting nut 31 faces the cover plate 20, and a first threaded groove is provided inside the first mounting nut 31, penetrating the head end of the first mounting nut 31. The tail end of the first mounting nut 31 is located within the receiving cavity 11, and a threaded surface is provided on the outer side of the tail end of the first mounting nut 31. A locking nut 33 is sleeved and threadedly connected to the tail end of the first mounting nut 31, and the locking nut 33 abuts against the retaining edge 12 to reinforce the first mounting nut 31.

[0054] For example, the cover plate 20 is provided with a first countersunk hole 26 corresponding to the first mounting screw 32. The first countersunk hole 26 is recessed on the side of the cover plate 20 away from the flange 12, and the first protective sleeve 261 is disposed in the first countersunk hole 26. The first washer 25 is bonded and fixed to the side of the cover plate 20 facing the flange 12. The first protective sleeve 261 is made of plastic, and the first washer 25 is made of rubber. The shank of the first mounting screw 32 passes through the first protective sleeve 261, the cover plate 20, and the first washer 25, and is threaded and fixed in the first threaded groove of the first mounting nut 31. The first mounting screw 32 abuts against the first protective sleeve 261 and the cover plate 20 through its head, and the locking nut 33 abuts against the flange 12 to clamp and fix the cover plate 20 and the flange 12.

[0055] Please refer to the following: Figure 7 In some embodiments, the second screw assembly 40 includes a second mounting nut 41 and a second mounting screw 42. The second mounting nut 41 has a raised edge 411 on its outer side, which is distributed circumferentially around the second mounting nut 41. The second mounting nut 41 passes through and is fixed to the retaining edge 12, with the raised edge 411 abutting against the side of the retaining edge 12 away from the second side 22. The second mounting screw 42 passes through the second side 22 and is threaded into the second mounting nut 41. Thus, the second mounting nut 41 and the second mounting screw 42 cooperate to clamp and fix the cover plate 20 and the retaining edge 12 between the raised edge 411 and the second mounting screw 42.

[0056] Specifically, the cover plate 20 is provided with a second washer, which is clamped between the second side 22 and the retaining edge 12, and the second mounting screw 42 passes through the second washer. The second washer plays a sealing and cushioning role between the cover plate 20 and the retaining edge 12, preventing moisture from the external environment from entering the interior of the housing 10 and reducing mechanical wear between the cover plate 20 and the retaining edge 12.

[0057] Specifically, the cover plate 20 is provided with a second protective sleeve 271, and a second mounting screw 42 passes through the second protective sleeve 271 and the cover plate 20, and is threaded into the second mounting nut 41. The second protective sleeve 271 protects the cover plate 20 and reduces mechanical wear, while also providing a certain preload between the second mounting screw 42 and the cover plate 20, thereby improving the connection strength of the second mounting screw 42.

[0058] For example, the second mounting nut 41 extends integrally along a third direction, and the retaining edge 12 has a second mounting hole 122. The second mounting nut 41 can be inserted and fixed to the second mounting hole 122 of the retaining edge 12 by press riveting or pull riveting. The first mounting nut 31 is inserted and fixed to the retaining edge 12 by press riveting. The head end of the second mounting nut 41 faces the cover plate 20, and the interior of the second mounting nut 41 is provided with a second threaded groove that penetrates the head end of the second mounting nut 41. The tail end of the second mounting nut 41 is located in the receiving cavity 11.

[0059] For example, the cover plate 20 is provided with a second countersunk hole 27 corresponding to the second mounting screw 42. The second countersunk hole 27 is recessed on the side of the cover plate 20 away from the flange 12, and the second protective sleeve 271 is disposed in the second countersunk hole 27. The second washer is bonded and fixed to the side of the cover plate 20 facing the flange 12. The second protective sleeve 271 is made of plastic, and the second washer is made of rubber. The shank of the second mounting screw 42 passes through the second protective sleeve 271, the cover plate 20, and the second washer, and is threaded and fixed in the first threaded groove of the second mounting nut 41. The second mounting screw 42 abuts against the second protective sleeve 271 and the cover plate 20 with its head, and the protruding edge 411 abuts against the side of the flange 12 away from the cover plate 20, so as to clamp and fix the cover plate 20 and the flange 12.

[0060] Specifically, the first area of ​​the locking nut 33 abutting against the retaining edge 12 is larger than the second area of ​​the protruding edge 411 abutting against the retaining edge 12. The first area can be considered as the contact area between the first screw assembly 30 and the retaining edge 12, and the second area can be considered as the contact area between the second screw assembly 40 and the retaining edge 12. For example, the first area can be 122 square millimeters, and the second area can be 50 square millimeters. It is worth noting that the specific values ​​of the first and second areas can be determined by the cross-sectional areas of the locking nut 33 and the protruding edge 411, and can be configured according to actual needs; this application does not impose any limitations on this.

[0061] It is understandable that when the internal air pressure of the housing 10 increases, the air pressure impacts the cover plate 20, forcing the first mounting screw 32 to pull the first mounting nut 31 outward and the second mounting screw 42 to pull the second mounting nut 41 outward. This application uses a locking nut 33 to reinforce the first mounting nut 31, creating a difference in connection strength between the first mounting nut 31, the second mounting nut 41, and the retaining edge 12. When the high pressure inside the housing 10 reaches a specified threshold, the protruding edge 411 can no longer maintain the fixation between the second mounting nut 41 and the retaining edge 12, making it easy for the protruding edge 411 to detach from the retaining edge 12 through the second mounting hole 122. This allows the retaining edge 12 and the cover plate 20 to separate and quickly release pressure, while the locking nut 33 still maintains the fixation between the first mounting nut 31 and the retaining edge 12, ensuring that the cover plate 20 remains on the housing 10 and preventing it from being blown away, thus achieving double safety protection.

[0062] It is worth noting that the cover plate 20 described above can be either the first panel 50 or the second panel 60, and this application does not limit it in this regard.

[0063] This application also provides a photovoltaic inverter.

[0064] like Figure 1 As shown, the photovoltaic inverter includes electronic components and a housing assembly 100. The electronic components are housed within the housing assembly 100, which protects them. The electronic components include, but are not limited to, an inverter module, a control module, a battery management module, electronic components (such as electrolytic capacitors), and sensors, which can be configured according to the actual application scenario.

[0065] The implementation principle and beneficial effects of the photovoltaic inverter provided in this application can be specifically described in the foregoing implementation, and this application does not impose any limitations on them.

[0066] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments described above should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application.

Claims

1. A box assembly, characterized in that, include: The box has a receiving cavity and a retaining edge is provided at the opening of the receiving cavity; A cover plate overlaps the retaining edge and covers the receiving cavity; the cover plate has a first side and a second side disposed opposite to each other. A first screw-in assembly is used to fix the first side to the retaining edge. The second screw assembly is used to fix the second side to the retaining edge; the connection strength between the first screw assembly and the retaining edge is greater than the connection strength between the second screw assembly and the retaining edge. When the internal pressure of the housing increases, the second screw assembly gradually disengages from the flange, so that the second side is at least partially away from the housing and forms a breathable gap.

2. The box assembly of claim 1, wherein, The contact area between the first screw assembly and the flange is greater than the contact area between the second screw assembly and the flange.

3. The box assembly of claim 1, wherein, The first screw assembly includes a first mounting nut, a first mounting screw, and a locking nut, wherein the locking nut abuts against the side of the retaining edge away from the cover plate; the outer side of the first mounting nut is provided with a threaded surface, the first mounting nut passes through the retaining edge, and is threadedly connected to the locking nut; the first mounting screw passes through the first side and is threadedly connected to the first mounting nut.

4. The box assembly of claim 3, wherein, The cover plate is provided with a first washer, which is clamped between the first side and the stop edge, and the first mounting screw passes through the first washer.

5. The box assembly of claim 3, wherein, The second screw assembly includes a second mounting nut and a second mounting screw. The outer side of the second mounting nut is provided with a protruding edge. The second mounting nut passes through and is fixed to the stop edge, and the protruding edge abuts against the side of the stop edge away from the second side. The second mounting screw passes through the second side and is threaded into the second mounting nut.

6. The box assembly of claim 5, wherein, The first area where the locking nut abuts against the stop edge is larger than the second area where the convex edge abuts against the stop edge.

7. The box assembly of claim 1, wherein, The box body is provided with a crossbeam extending along a first direction. The crossbeam is suspended at the opening of the accommodating cavity, and both ends of the crossbeam are respectively fixed to the box body. The cover plate includes a first panel and a second panel distributed along a second direction. The first panel covers the area of ​​the receiving cavity near one side of the crossbeam, and the second panel covers the area of ​​the receiving cavity near the other side of the crossbeam. The first direction is perpendicular to the second direction.

8. The box assembly of claim 7, wherein, The first panel has a first side and a second side on both sides in the first direction. The first panel is fixedly connected to the crossbeam. The first screw assembly is disposed on the first side away from the crossbeam, and the second screw assembly is disposed on the second side away from the crossbeam.

9. The box assembly of claim 8, wherein, The second panel has a first side and a second side on both sides in the first direction. The second panel is provided with a pin that can be inserted into the first panel. The first screw assembly is arranged on the part of the second panel away from the crossbeam on the first side. The second screw assembly is arranged on the part of the second panel away from the crossbeam on the second side.

10. A photovoltaic inverter, characterized by An electronic assembly comprising a housing assembly as claimed in any one of claims 1 to 9, said electronic assembly being arranged within said housing assembly.

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