Explosion-proof box, electronic equipment and electric power system

Abstract

The utility model provides an explosion-proof box, electronic equipment and a power system, and relates to the technical field of power electronics. In the explosion-proof box, a box body and a box cover are respectively connected at a plurality of positions through a plurality of connecting units; at least part of the connecting units comprise a first connecting structure and a second connecting structure; the first connecting structure is connected with the box body, and the second connecting structure penetrates through a second connecting hole formed in the box cover and a first connecting hole formed in the first connecting structure and is connected with the first connecting hole; the connecting units comprise first set connecting units, and the connecting strength of the box body and the box cover at the connecting units except at least one first set connecting unit is higher than that of the box body and the box cover at the first set connecting units; the first setting connection unit comprises a first connection structure and a second connection structure; and in the joints corresponding to the first set connecting units, the connecting strength of the joint of the first connecting structure and the box body is weaker than the connecting strength of other joints.

Description

Technical Field

[0001] The present disclosure relates to the field of power electronics technology, and more particularly, to an explosion-proof box, an electronic device, and a power system. Background Art

[0002] In power electronic devices such as inverters, the gas pressure in the inner cavity of the housing has the possibility of increasing within a short period of time. For example, some electronic components in the inner cavity may release combustible gases. After these gases are mixed with the air in the box, an explosive gas mixture is formed. Once there is a spark or discharge phenomenon in the box, it is very likely to cause ignition or even explosion. The huge energy released will not only damage the device itself, but may also cause components such as the box cover to break away and fly out at high speed, affecting the performance of the device. Summary of the Utility Model

[0003] The present disclosure aims to solve, to a certain extent, the problem in the related art of how to improve the explosion-proof performance of devices.

[0004] To solve at least one aspect of the above problems to at least a certain extent, in a first aspect, the present disclosure provides an explosion-proof box, including a box body, a box cover, and a plurality of connection units; the box body and the box cover are connected to each other at a plurality of positions through the plurality of connection units;

[0005] At least some of the plurality of connection units include a first connection structure and a second connection structure; the first connection structure is connected to the box body, and the second connection structure passes through a second connection hole provided in the box cover and a first connection hole provided in the first connection structure and is connected to the first connection hole;

[0006] Among the plurality of connection units, there is a first set connection unit, and the connection strength between the box body and the box cover at the connection units other than at least one of the first set connection units is stronger than the connection strength between the box body and the box cover at the first set connection unit;

[0007] The first set connection unit includes the first connection structure and the second connection structure; among the connections corresponding to the first set connection unit, the connection strength between the first connection structure and the box body is weaker than the connection strengths at other connections.

[0008] Optionally, when the gas pressure in the cavity formed by the box body and the box cover is greater than or equal to a preset pressure, the first connection structure of the first set connection unit is configured to separate from the box body.

[0009] Optionally, at least one of the first connection structures further includes a first limiting portion and a first column. A third connection hole is provided in a set portion of the box body. The first column penetrates through the third connection hole. The first limiting portion is located at an end of the first column away from the box cover, and the first limiting portion is connected to the first column. The first limiting portion is connected to the set portion at the edge of the third connection hole;

[0010] When the first limiting portion of the first connection structure of the first set connection unit includes the first limiting portion and the gas pressure in the cavity formed by the box body and the box cover is greater than or equal to a preset pressure, the first limiting portion of the first connection structure of the first set connection unit is configured to undergo plastic deformation or elastic deformation to separate from the set portion.

[0011] Optionally, the first limiting portion of at least one of the first connection structures and the first column are integrally connected to form a riveting column structure, and the riveting column structure is riveted and connected to the set portion;

[0012] Alternatively, the first limiting portion is snap-connected to the set portion at the edge of the third connection hole.

[0013] Optionally, the first connection structure having the first limiting portion and the first column further includes a second limiting portion. The second limiting portion is spaced apart from the first limiting portion and connected to the first column. The second limiting portion is at least partially located on a side of the set portion facing the box cover, and the second limiting portion abuts against the set portion.

[0014] Optionally, the second limiting portion is detachably connected to the first column.

[0015] Optionally, the second limiting portion includes a nut member. The nut member is sleeved on the first column and is threadedly connected to the first column.

[0016] Optionally, the second connection structure includes a second column and a third limiting portion. The second column penetrates through the second connection hole. The third limiting portion is connected to an end of the second column away from the first connection structure, and the third limiting portion abuts against the box cover at the edge of the second connection hole;

[0017] Wherein, the first connection hole is a threaded hole. The second column is provided with a threaded post and is threadedly connected to the first connection hole through the threaded post. Alternatively, the first connection hole is a through hole. A snap portion is provided at an end of the second column away from the third limiting portion. The snap portion passes through the first connection hole and is snap-connected to the first connection structure at the edge of the first connection hole.

[0018] Optionally, one end of the first connection structure close to the box cover abuts against the box cover.

[0019] Optionally, at least one second set connection unit is included in the plurality of connection units. The second set connection unit includes the first connection structure and the second connection structure, and the connection strength at each connection corresponding to the second set connection unit is stronger than the connection strength at the connection between the first connection structure and the box body of the first set connection unit.

[0020] Optionally, the plurality of connection units are distributed along the circumferential direction of the box cover, and the number of the first set connection units in the plurality of connection units is less than or equal to the number of the second set connection units.

[0021] In a second aspect, the present disclosure provides an electronic device including the explosion-proof box as described in the first aspect above.

[0022] In a third aspect, the present disclosure provides a power system including the explosion-proof box as described in the first aspect above, or including the electronic device as described in the second aspect above.

[0023] In the explosion-proof box, electronic device and power system of the present disclosure, the box body and the box cover are connected at multiple positions through a plurality of connection units respectively. Specifically, at least some of the plurality of connection units include a first connection structure and a second connection structure; the first connection structure is connected to the box body, and the second connection structure passes through the second connection hole provided on the box cover and the first connection hole provided on the first connection structure and is connected to the first connection hole, so as to realize the relative position fixation of the box body and the box cover. At least one of the connection units having the first connection structure and the second connection structure (defined as the set connection unit) is the first set connection unit, and the connection strength between the box body and the box cover at the connection units other than at least one first set connection unit is set to be stronger than the connection strength between the box body and the box cover at the first set connection unit. Thus, when the gas pressure in the cavity surrounded by the box body and the box cover is greater than or equal to the preset pressure, the connection between the box body and the box cover at the first set connection unit will be damaged, and the connection between the box body and the box cover through the first set connection unit fails. Specifically, since the connection strength between the first connection structure and the box body at each connection corresponding to the first set connection unit is set to be weaker than the connection strength at other connections, the connection between the box body and the box cover through the first set connection unit will preferentially fail at the connection between the first connection structure and the box body. The second connection structure of the first set connection unit and the first connection structure connected by the second connection structure both remain on the box cover, and the part of the box cover corresponding to the first set connection unit can move relative to the box body, so that the gap between the box cover and the box body at the first set connection unit increases, realizing the explosion-proof pressure relief requirement of the explosion-proof box and improving the explosion-proof performance of the device. Description of the Drawings

[0024] Figure 1 A top view schematic diagram of the explosion-proof box in the embodiment of the present disclosure;

[0025] Figure 2 A schematic structural diagram of the box body and the box cover connected by the first set connection unit in the embodiment of the present disclosure;

[0026] Figure 3 A schematic diagram of the state where the first limiting portion of the first set connection unit is separated from the set portion of the box body in the embodiment of the present disclosure;

[0027] Figure 4 A schematic structural diagram of the box body and the box cover connected by the second set connection unit in the embodiment of the present disclosure;

[0028] Figure 5 A schematic structural diagram of the second set connection unit in the embodiment of the present disclosure.

[0029] Explanation of reference numerals:

[0030] 1 - box body; 11 - set portion; 111 - third connection hole; 2 - box cover; 21 - second connection hole; 31 - first connection structure; 311 - first connection hole; 312 - first limiting portion; 313 - first cylinder; 314 - second limiting portion; 32 - second connection structure; 321 - second cylinder; 322 - third limiting portion; 3A - first set connection unit; 3B - second set connection unit; 301 - first connection unit; 302 - second connection unit; 303 - third connection unit; 304 - fourth connection unit; 305 - fifth connection unit; 306 - sixth connection unit; 307 - seventh connection unit; 308 - eighth connection unit. Detailed implementation manners

[0031] In order to make the above objects, features and advantages of the present disclosure more obvious and understandable, the following will describe the specific embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0032] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0033] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment", "some embodiments", "exemplarily", and "one embodiment" mean that the specific features, structures, materials, or characteristics described in connection with that embodiment or embodiment are included in at least one embodiment or embodiment of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or embodiments.

[0034] The terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features.

[0035] In the drawings, the Z-axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction of the arrow of the Z-axis) represents up, and the negative direction of the Z-axis represents down; the X-axis in the drawings represents the front and back position, and the positive direction of the X-axis (that is, the direction of the arrow of the X-axis) represents the front side, and the negative direction of the X-axis represents the back side; the Y-axis in the drawings represents the horizontal direction and is specified as the left and right position, and the positive direction of the Y-axis (that is, the direction of the arrow of the Y-axis) represents the right side, and the negative direction of the Y-axis represents the left side; at the same time, it should be noted that the above-mentioned meanings represented by the Z-axis, Y-axis, and X-axis are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present disclosure.

[0036] As Figures 1 to 3 shown, in a first aspect, the present disclosure provides an explosion-proof box, which includes a box body 1, a box cover 2, and a plurality of connecting units; the box body 1 and the box cover 2 are connected to each other at a plurality of positions through the plurality of connecting units;

[0037] At least some of the plurality of connecting units include a first connecting structure 31 and a second connecting structure 32; the first connecting structure 31 is connected to the box body 1, and the second connecting structure 32 passes through a second connecting hole 21 provided on the box cover 2 and a first connecting hole 311 provided on the first connecting structure 31 and is connected to the first connecting hole 311;

[0038] Among the plurality of connecting units, there is a first set connecting unit 3A, and the connection strength between the box body 1 and the box cover 2 at the connection units other than at least one first set connecting unit 3A is stronger than the connection strength between the box body 1 and the box cover 2 at the first set connecting unit 3A;

[0039] The first set connection unit 3A includes the above-mentioned first connection structure 31 and second connection structure 32; among the connection parts corresponding to the first set connection unit 3A, the connection strength between the first connection structure 31 and the box body 1 is weaker than that of other connection parts.

[0040] The box body 1 generally refers to the part for installing the main components inside the explosion-proof box. The total weight of the box body 1 and the components installed thereon is usually greater than the total weight of the box cover 2 and the components installed thereon. In this embodiment, optionally, the box body 1 has an opening facing upward, and the box cover 2 is covered at the opening. The box cover 2 and the box body 1 are connected by a plurality of connection units, so that the box cover 2 is kept at the opening at the top of the box body 1. A cavity for accommodating components is formed between the box body 1 and the box cover 2, so that the explosion-proof box meets the corresponding protection level requirements. Hereinafter, this will be taken as an example to illustrate the present disclosure, but it should be understood that the specific structures of the box body 1 and the box cover 2 are not limited thereto.

[0041] The specific structures and arrangement positions of the connection units can be different. Through the combined action of the connection units, it is only necessary to keep the box cover 2 at the opening of the box body 1. As Figure 1 shown, in this specification, an example will be given with eight connection units provided between the box body 1 and the box cover 2. Specifically, the first connection unit 301, the second connection unit 302, the third connection unit 303, the fourth connection unit 304, the fifth connection unit 305, the sixth connection unit 306, the seventh connection unit 307 and the eighth connection unit 308 are arranged in sequence in the circumferential direction of the opening in the clockwise direction. Among them, the first connection unit 301, the third connection unit 303, the fifth connection unit 305 and the seventh connection unit 307 are respectively arranged at the left front corner, the right front corner, the right rear corner and the left rear corner of the opening. The structural forms of the first connection unit 301, the second connection unit 302, the third connection unit 303, the fourth connection unit 304, the fifth connection unit 305, the sixth connection unit 306, the seventh connection unit 307 and the eighth connection unit 308 can be the same or different.

[0042] It should be noted that the connection strength between the box body 1 and the box cover 2 at a certain connection unit is achieved through the connection of the corresponding connection unit, that is, the setting of the connection unit enables the box body 1 and the box cover 2 to obtain this connection strength. Among multiple connection units, the connection strength between the box body 1 and the box cover 2 at a connection unit other than at least one first set connection unit 3A is stronger than the connection strength between the box body 1 and the box cover 2 at the first set connection unit 3A. For example, among all connection units, the connection strength between the corresponding box body 1 and box cover 2 at the first set connection unit 3A obtains the minimum value. When the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to a preset pressure (the preset pressure is determined according to actual requirements), the connection between the box body 1 and the box cover 2 at the first set connection unit 3A is damaged, and the connection between the box body 1 and the box cover 2 through the first set connection unit 3A fails. Thus, the part of the box cover 2 corresponding to the first set connection unit 3A can move relative to the box body 1, increasing the gap between the box cover 2 and the box body 1, thereby realizing the pressure relief requirement of the explosion-proof box and reducing the risk caused by excessive internal pressure of the explosion-proof box.

[0043] Among multiple connection units, there may only be connection units including the first connection structure 31 and the second connection structure 32 (subsequently, such connection units are defined as set connection units). For example, among multiple set connection units, there includes the first set connection unit 3A and the second set connection unit 3B described later. The present disclosure will be described hereinafter by taking this as an example.

[0044] However, it should be understood that among multiple connection units, there may also be connection units other than set connection units, which is not a limitation. For example, some connection units only include screws, and the screws pass through the box cover 2 and are threadedly connected to the box body 1. However, the connection strength between the box body 1 and the box cover 2 through this screw connection is greater than the connection strength between the box body 1 and the box cover 2 at the first set connection unit 3A.

[0045] Specifically, the connection parts corresponding to the first set connection unit 3A include: the connection part where the second connection structure 32 is connected to the box cover 2, the connection part where the second connection structure 32 is connected to the first connection structure 31, and the connection part where the first connection structure 31 is connected to the box body 1.

[0046] The connection strength at the connection between the first connection structure 31 and the box body 1 is set to be weaker than that at other connection parts. That is to say, the first set connection unit 3A meets the following conditions: the connection strength at the connection between the second connection structure 32 and the box cover 2, and the connection strength at the connection between the second connection structure 32 and the first connection structure 31 are both greater than the connection strength at the connection between the first connection structure 31 and the box body 1. Thus, when the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to the preset pressure, among the connections corresponding to the first set connection unit 3A, the connection between the box body 1 and the box cover 2 through the first set connection unit 3A will preferentially fail at the connection between the first connection structure 31 and the box body 1. Thus, when the first set connection unit 3A fails, the second connection structure 32 of the first set connection unit 3A and the first connection structure 31 connected by the second connection structure 32 both remain on the box cover 2.

[0047] In this embodiment, the box body 1 and the box cover 2 are connected at multiple positions through multiple connection units. Specifically, at least some of the multiple connection units include a first connection structure 31 and a second connection structure 32; the first connection structure 31 is connected to the box body 1, and the second connection structure 32 passes through a second connection hole 21 provided on the box cover 2 and a first connection hole 311 provided on the first connection structure 31 and is connected to the first connection hole 311, so as to fix the relative positions of the box body 1 and the box cover 2. At least one of the connection units having the first connection structure 31 and the second connection structure 32 (defined as the set connection unit) is the first set connection unit 3A. The connection strength between the box body 1 and the box cover 2 at the connection units other than at least one first set connection unit 3A is set to be stronger than the connection strength between the box body 1 and the box cover 2 at the first set connection unit 3A. Thus, when the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to the preset pressure, the connection between the box body 1 and the box cover 2 at the first set connection unit 3A will be damaged, and the connection between the box body 1 and the box cover 2 through the first set connection unit 3A fails. Specifically, since the connection strength at the connection between the first connection structure 31 and the box body 1 among the connections corresponding to the first set connection unit 3A is set to be weaker than that at other connections, the connection between the box body 1 and the box cover 2 through the first set connection unit 31 will preferentially fail at the connection between the first connection structure 31 and the box body 1. The second connection structure 32 of the first set connection unit 31 and the first connection structure 31 (which can be part or all of the first connection structure 31) connected by the second connection structure 32 both remain on the box cover 2. Thus, the part of the box cover 2 corresponding to the first set connection unit 3A can move relative to the box body 1, so that the gap between the box cover 2 and the box body 1 at the first set connection unit 3A increases, meeting the explosion-proof and pressure-relief requirements of the explosion-proof box.

[0048] In this embodiment, among the joints corresponding to the first set connection unit 3A, the connection strength between the first connection structure 31 and the box body 1 is set to be weaker than that of other joints, which can reduce the possibility of components such as the second connection structure 32 on the box cover 2 flying out due to pressure relief at the first set connection unit 3A of the explosion-proof box, causing damage to the components and personnel around the explosion-proof box, and improving the safety of the explosion-proof box.

[0049] Optionally, when the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to a preset pressure, the first connection structure 31 of the first set connection unit 3A is configured to separate from the box body 1.

[0050] Specifically, the first connection structure 31 of the first set connection unit 3A is configured to separate from the box body 1 when the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to a preset pressure. The connection method before separation is not limited. For example, it can be connection methods such as bonding, clamping, and threaded connection.

[0051] Certainly, in some other scenarios, among the joints corresponding to the first set connection unit 3A, the connection strength between the first connection structure 31 and the box body 1 is weaker than that of other joints. The connection strength between the first connection structure 31 and the box body 1 can be achieved through a weakening structure of the first connection structure 31 near the box body 1. In this case, when the connection fails due to excessive force at this joint, the first connection structure 31 usually breaks and is divided into two parts. One part remains on the box cover 2 due to connection with the second connection structure 32, and the other part may remain on the first connection structure 31 or may fall off the first connection structure 31 and may fall onto the internal functional components of the explosion-proof box, affecting the performance of the functional components.

[0052] In this embodiment, this separable connection method, when the connection between the first connection structure 31 and the box body 1 fails, the first connection structure 31 is integrally connected to the second connection structure 32 and remains on the box cover 2, which can avoid the generation of independently separable components and reduce the possibility of affecting the functional components inside the box body 1 due to the failure of the first set connection unit 3A.

[0053] Optionally, at least one first connection structure 31 further includes a first limiting portion 312 and a first column 313. A third connection hole 111 is provided in a set portion 11 of the box body 1. The first column 313 passes through the third connection hole 111. The first limiting portion 312 is located at the end of the first column 313 away from the box cover 2, and the first limiting portion 312 is connected to the first column 313. The first limiting portion 312 is connected to the set portion 11 at the edge of the third connection hole 111.

[0054] Specifically, it is set that the connecting unit is connected to the set part 11 of the box body 1 through the first limiting part 312 of the first connecting structure 31. The connection between the first limiting part 312 and the box body 1 can be a connection method such as snap connection.

[0055] The set part 11 is usually located at the edge of the opening of the box body 1. The box body 1 can be structurally strengthened at the set part 11. For example, the set part 11 is thickened, or a reinforcing plate is configured at the set part 11 of the box body 1 to enhance the anti-deformation performance of the set part 11. Thus, in some cases, when the set connecting unit fails, the box body 1 can still be put into use, or can be put into use after simple maintenance, reducing the maintenance cost.

[0056] As Figure 2 and Figure 3 As shown, in this embodiment, the first limiting part 312 of the first connecting structure 31 of the first set connecting unit 3A includes the first limiting part 312. When the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to the preset pressure, the first limiting part 312 of the first connecting structure 31 of the first set connecting unit 3A is used to separate from the set part 11.

[0057] Specifically, the first limiting part 312 of the first connecting structure 31 of the first set connecting unit 3A is designed by its structure or material such that it can deform relative to the first cylinder 313, so that the first connecting structure 31 can separate from the set part 11 of the box body 1, meeting the requirement of the connection failure of the first set connecting unit 3A in specific situations (when the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to the preset pressure).

[0058] It should be understood that this deformation of the first limiting part 312 can be elastic deformation or plastic deformation.

[0059] In this way, through the connection between the first limiting part 312 and the set part 11 of the box body 1, the upward movement of the connecting unit and the connected box cover 2 can be restricted, ensuring the connection performance between the box body 1 and the box cover 2. And when the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to the preset pressure, the first limiting part 312 of the first connecting structure 31 of the first set connecting unit 3A is used to undergo plastic deformation or elastic deformation to separate from the set part 11, which can avoid some parts of the first set connecting unit 3A flying out due to the failure of the first set connecting unit 3A, avoiding potential safety hazards.

[0060] Optionally, the first limiting part 312 of at least one first connecting structure 31 is integrally connected to the first cylinder 313 to form a riveting column structure, and the riveting column structure is riveted to the set part 11.

[0061] [[ID=2,5]]AsFigure 2 and Figure 3 As shown in Figure 3 , taking the first setting connection unit 3A as an example, its first limiting part 312 has a limiting plate structure, such that the first column 313 passes through the third connection hole 111 from bottom to top and the first limiting part 312 is located below the setting part 11. The riveting column structure is riveted on the setting part 11 through a riveting device. Specifically, at least part of the first limiting part 312 sinks upward and is pressed into the setting part 11, so that the relative position between the first limiting part 312 and the setting part 11 is fixed. When the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to the preset pressure, the first limiting part 312 undergoes plastic deformation and separates from the setting part 11 of the box body 1 through the third connection hole 111, so that the connection between the box body 1 and the box cover 2 fails at the first setting connection unit 3A.

[0062] Different from the above technical solution in which the first limiting part 312 and the first column 313 are integrally connected to form a riveting column structure, the first limiting part 312 is clamped with the setting part 11 at the edge of the third connection hole 111.

[0063] Specifically, the first limiting part 312 is connected to the first column 313 and forms a clamping protrusion at the lower end of the first column 313. The clamping protrusion is clamped with the setting part 11 at the lower end edge of the third connection hole 111. When the gas pressure in the cavity formed by the box body 1 and the box cover 2 is greater than or equal to the preset pressure, the clamping protrusion corresponding to the first setting connection unit 3A separates from the setting part 11 through, for example, elastic deformation. This solution is not shown in the figure and will not be elaborated here.

[0064] In the above embodiment, optionally, the first connection structure 31 having the first limiting part 312 and the first column 313 further includes a second limiting part 314. The second limiting part 314 is spaced from the first limiting part 312 and is connected to the first column 313. At least part of the second limiting part 314 is located on the side of the setting part 11 facing the box cover 2, and the second limiting part 314 abuts against the setting part 11.

[0065] As Figure 2 shown, specifically, the second limiting part 314 is located above the setting part 11. Thus, the first connection structure 31 can be held on the setting part 11 of the box body 1 through the combined action of the first limiting part 312 and the second limiting part 314, ensuring the position stability of the first connection structure 31 at the setting part 11. Its structure is simple and practical.

[0066] As Figure 2 shown, optionally, the second limiting part 314 is detachably connected to the first column 313.

[0067] Exemplarily, the second limiting portion 314 includes a nut member, and the nut member is sleeved on the first column 313 and is threadedly connected to the first column 313.

[0068] Of course, in other embodiments, the detachable connection manner between the second limiting portion 314 and the first column 313 is not limited thereto. For example, the two can be snap-connected, and details are not described herein.

[0069] In this way, it is convenient for the assembly of the second limiting portion 314 and the first column 313. Moreover, in some scenarios, when the first set connection unit 3A fails, some of the second limiting portions 314 can be disassembled and reused, which can reduce the use cost to a certain extent.

[0070] In the above embodiment, optionally, the second connection structure 32 includes a second column 321 and a third limiting portion 322. The second column 321 passes through the second connection hole 21, and the third limiting portion 322 is connected to the end of the second column 321 away from the first connection structure 31, and the third limiting portion 322 abuts against the box cover 2 at the edge of the second connection hole 21;

[0071] Among them, the first connection hole 311 is a threaded hole, and the second column 321 is provided with a threaded post and is threadedly connected to the first connection hole 311 through the threaded post.

[0072] Specifically, as Figure 2 shown, the first connection hole 311 can be a threaded hole in the form of a blind hole or a through hole. The second connection structure 32 includes a screw. The small end of the screw is provided with a threaded post, and the large end of the screw constitutes the third limiting portion 322. The second connection structure 32 passes through the second connection hole 21 on the box cover 2 and is threadedly connected to the first connection hole 311. Thus, the locking force between the box body 1 and the box cover 2 at the first set connection unit 3A can be adjusted by screwing in the second connection structure 32.

[0073] Of course, different from the case where the first connection hole 311 is a threaded hole, in some scenarios, the first connection hole 311 is a through hole, and a clamping portion is provided at the end of the second column 321 away from the third limiting portion 322. The clamping portion passes through the first connection hole 311 and is clamped to the first connection structure 31 at the edge of the first connection hole 311. The clamping between the clamping portion and the first connection hole 311 facilitates the clamping with the first connection structure 31, and the box cover 2 and the box body 1 can be tightened at the set connection unit.

[0074] In the above embodiment, optionally, the end of the first connection structure 31 close to the box cover 2 abuts against the box cover 2.

[0075] In this way, it is possible to avoid damage to the lid 2 caused by excessive tensile force when setting the connecting unit to connect the box body 1 and the lid 2. Moreover, when the connection between the first connection structure 31 and the box body 1 fails, the position stability of the first connection structure 31 and the second connection structure 32 on the lid 2 can be ensured.

[0076] In the above embodiment, optionally, at least one second set connecting unit 3B is included in the plurality of connecting units. The second set connecting unit 3B includes a first connection structure 31 and a second connection structure 32, and the connection strength at each connection corresponding to the second set connecting unit 3B is stronger than the connection strength at the connection between the first connection structure 31 of the first set connecting unit 3A and the box body 1.

[0077] As Figure 4 and Figure 5 shown, similarly, the connections corresponding to the second set connecting unit 3B include: the connection where the second connection structure 32 is connected to the lid 2, the connection where the second connection structure 32 is connected to the first connection structure 31, and the connection where the first connection structure 31 is connected to the box body 1. The connection strength of these three connections is stronger than the connection strength at the connection between the first connection structure 31 of the first set connecting unit 3A and the box body 1. Thus, when the gas pressure in the cavity formed by the box body 1 and the lid 2 is greater than or equal to the preset pressure, the connection failure preferentially occurs at the connection between the first connection structure 31 of the first set connecting unit 3A and the box body 1, thereby meeting the pressure relief requirement of the explosion-proof box.

[0078] In this embodiment, taking the first limiting portion 312 of the first connection structure 31 of each set connecting unit being used to undergo plastic deformation or elastic deformation to separate from the set portion 11 as an example for illustration, the size of the first limiting portion 312 of the second set connecting unit 3B can be configured to be larger than the size of the first limiting portion 312 of the first set connecting unit 3A.

[0079] Taking the first limiting portion 312 as a disc-shaped structure as an example, the thickness of the disc-shaped structure of the second set connecting unit 3B can be greater than the thickness of the disc-shaped structure of the first set connecting unit 3A. For example, the thickness of the disc-shaped structure of the second set connecting unit 3B can be 3 millimeters, and the thickness of the disc-shaped structure of the first set connecting unit 3A can be 0.5 millimeters. The diameter of the disc-shaped structure of the second set connecting unit 3B can be greater than the diameter of the disc-shaped structure of the first set connecting unit 3A. For example, the diameter of the second set connecting unit 3B can be 20 millimeters, and the diameter of the disc-shaped structure of the first set connecting unit 3A can be 12 millimeters. The structures and sizes of other parts of the second set connecting unit 3B and the first set connecting unit 3A can be the same, and will not be described in detail here.

[0080] In the above embodiment, optionally, the plurality of connecting units are distributed along the circumferential direction of the lid 2.

[0081] Further, the number of the first set connection units 3A among the multiple connection units is less than or equal to the number of the second set connection units 3B.

[0082] Specifically, the above-mentioned first connection unit 301, second connection unit 302, third connection unit 303, fourth connection unit 304, fifth connection unit 305, sixth connection unit 306, seventh connection unit 307, and eighth connection unit 308 are all set connection units, and the number of the first set connection units 3A is less than or equal to the number of the second set connection units 3B.

[0083] Exemplarily, the first connection unit 301, third connection unit 303, fifth connection unit 305, and seventh connection unit 307 are the second set connection units 3B, and the second connection unit 302, fourth connection unit 304, sixth connection unit 306, and eighth connection unit 308 are the first set connection units 3A.

[0084] Exemplarily, the first connection unit 301, second connection unit 302, third connection unit 303, fifth connection unit 305, sixth connection unit 306, and seventh connection unit 307 are the second set connection units 3B, and the fourth connection unit 304 and eighth connection unit 308 are the first set connection units 3A.

[0085] Exemplarily, the first connection unit 301, third connection unit 303, fourth connection unit 304, fifth connection unit 305, seventh connection unit 307, and eighth connection unit 308 are the second set connection units 3B, and the second connection unit 302 and sixth connection unit 306 are the first set connection units 3A.

[0086] Exemplarily, the first connection unit 301, second connection unit 302, third connection unit 303, fourth connection unit 304, and eighth connection unit 308 are the second set connection units 3B, and the fifth connection unit 305, sixth connection unit 306, and seventh connection unit 307 are the first set connection units 3A.

[0087] In a second aspect, the present disclosure provides an electronic device, which includes the explosion-proof box of the above embodiment. For example, the electronic device can be a power electronic device such as an inverter or a current converter.

[0088] In a third aspect, the present disclosure provides a power system, which includes the explosion-proof box of the above embodiment, or includes the electronic device of the above embodiment. The power system can be a photovoltaic system, an energy storage system, etc.

[0089] Although the present disclosure is disclosed as above, the scope of protection of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the scope of protection of the present disclosure.

Claims

1. An explosion-proof box, characterized in that, It includes a box body (1), a box cover (2) and a plurality of connecting units; the box body (1) and the box cover (2) are connected to each other at a plurality of positions through the plurality of connecting units; At least some of the plurality of connecting units include a first connecting structure (31) and a second connecting structure (32); the first connecting structure (31) is connected to the box body (1), and the second connecting structure (32) passes through a second connecting hole (21) provided on the box cover (2) and a first connecting hole (311) provided on the first connecting structure (31) and is connected to the first connecting hole (311); Among the plurality of connecting units, there is a first set connecting unit (3A), and the connection strength between the box body (1) and the box cover (2) at the connection units other than at least one of the first set connecting units (3A) is stronger than the connection strength between the box body (1) and the box cover (2) at the first set connecting unit (3A); The first set connecting unit (3A) includes the first connecting structure (31) and the second connecting structure (32); among the respective connection parts corresponding to the first set connecting unit (3A), the connection strength at the connection between the first connecting structure (31) and the box body (1) is weaker than the connection strength at other connection parts.

2. The explosion-proof box according to claim 1, characterized in that, When the gas pressure in the cavity formed by the box body (1) and the box cover (2) is greater than or equal to a preset pressure, the first connecting structure (31) of the first set connecting unit (3A) is used to separate from the box body (1).

3. The explosion-proof box according to claim 2, characterized in that, At least one of the first connecting structures (31) further includes a first limiting part (312) and a first column body (313), a third connecting hole (111) is provided on a set part (11) of the box body (1), the first column body (313) passes through the third connecting hole (111), the first limiting part (312) is located at one end of the first column body (313) away from the box cover (2), and the first limiting part (312) is connected to the first column body (313), and the first limiting part (312) is connected to the set part (11) at the edge of the third connecting hole (111); When the first limiting part (312) of the first connecting structure (31) of the first set connecting unit (3A) includes the first limiting part (312) and the gas pressure in the cavity formed by the box body (1) and the box cover (2) is greater than or equal to a preset pressure, the first limiting part (312) of the first connecting structure (31) of the first set connecting unit (3A) is used to undergo plastic deformation or elastic deformation to separate from the set part (11).

4. The explosion-proof box according to claim 3, characterized in that, The first limiting part (312) of at least one of the first connecting structures (31) is integrally connected to the first column body (313) to form a riveting column structure, and the riveting column structure is riveted to the set part (11); Or, the first limiting part (312) is snap-connected to the set part (11) at the edge of the third connecting hole (111).

5. The explosion-proof box according to claim 3, characterized in that, The first connection structure (31) having the first limiting portion (312) and the first cylinder (313) further includes a second limiting portion (314). The second limiting portion (314) is spaced from the first limiting portion (312) and connected to the first cylinder (313). At least a part of the second limiting portion (314) is located on the side of the set portion (11) facing the box cover (2), and the second limiting portion (314) abuts against the set portion (11).

6. The explosion-proof box according to claim 5, wherein, The second limiting portion (314) is detachably connected to the first cylinder (313).

7. The explosion-proof box according to claim 5, characterized in that, The second limiting portion (314) includes a nut member. The nut member is sleeved on the first cylinder (313) and is threadedly connected to the first cylinder (313).

8. The explosion-proof box according to any one of claims 1 to 7, characterized in that The second connection structure (32) includes a second cylinder (321) and a third limiting portion (322). The second cylinder (321) passes through the second connection hole (21). The third limiting portion (322) is connected to the end of the second cylinder (321) away from the first connection structure (31), and the third limiting portion (322) abuts against the box cover (2) at the edge of the second connection hole (21). Wherein, the first connection hole (311) is a threaded hole, the second cylinder (321) is provided with a threaded post and is threadedly connected to the first connection hole (311) through the threaded post. Or, the first connection hole (311) is a through hole, and a clamping portion is provided at the end of the second cylinder (321) away from the third limiting portion (322). The clamping portion passes through the first connection hole (311) and is clamped to the first connection structure (31) at the edge of the first connection hole (311).

9. The explosion-proof box according to any one of claims 1 to 7, characterized in that, One end of the first connection structure (31) close to the box cover (2) abuts against the box cover (2).

10. The explosion-proof box according to any one of claims 1 to 7, characterized in that, At least one second set connection unit (3B) is included in the plurality of connection units. The second set connection unit (3B) includes the first connection structure (31) and the second connection structure (32), and the connection strength at each connection corresponding to the second set connection unit (3B) is stronger than the connection strength at the connection between the first connection structure (31) of the first set connection unit (3A) and the box body (1).

11. The explosion-proof box according to claim 10, characterized in that, The plurality of connection units are distributed along the circumferential direction of the box cover (2). The number of the first set connection units (3A) in the plurality of connection units is less than or equal to the number of the second set connection units (3B).

12. An electronic device, characterized in that, An explosion-proof box according to any one of claims 1 to 11 is included.

13. A power system, characterized in that, An explosion-proof box according to any one of claims 1 to 11 is included, or an electronic device according to claim 12 is included.

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