Explosion-proof pressure relief structure and power equipment

Abstract

The utility model discloses an anti-explosion pressure relief structure and power equipment. The anti-explosion pressure relief structure comprises a box body, a cover body and a plurality of fastening assemblies, the cover body is installed on the box body in a fastening mode through the fastening assemblies, and a pressure relief area with the fastening force smaller than that of other areas is formed in a partial area of the cover body through uneven arrangement or different fastening capacities of the fastening assemblies. The power equipment comprises the explosion-proof pressure relief structure. The pressure relief structure has the beneficial effects that the pressure relief area with high deformation capacity is formed through different fastening forces of the cover body and the box body at different positions, so that the cover body and the box body can be reliably connected when the pressure in the box body is low, and the pressure relief area is not prone to deformation when the pressure in the box body exceeds a set value. The pressure relief opening is formed through deformation of the pressure relief area to connect the interior of the box body with the external environment, and therefore the pressure relief effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, in particular to an explosion-proof pressure relief structure and power equipment. BACKGROUND

[0002] The power converter is one of the core components of the photovoltaic power generation system, and the structure of the power converter mainly includes electrical components and a shell. The shell includes a box body and a cover body, and the box body and the cover body cooperatively enclose a good air-tightness accommodating space, and the electrical components are arranged in the good air-tightness accommodating space, so that the power converter meets the requirements of waterproof, dustproof and the like.

[0003] However, the power converter usually has a plurality of electrolytic capacitor devices inside, and a large amount of flammable gas is generated by gasification of electrolyte under abnormal conditions, which is easy to burn and explode. Since the box body and the cover body of the existing power converter are generally connected and sealed by fasteners, the pressure in the shell will instantaneously increase when an explosion occurs under abnormal conditions, and the cover body will fly out at high speed under the action of strong pressure, which is easy to injure the surrounding staff and other equipment. CONTENT OF THE UTILITY MODEL

[0004] One of the purposes of the present application is to provide an explosion-proof pressure relief structure capable of solving at least one defect in the background art.

[0005] In order to achieve the above at least one purpose, the technical solution adopted by the present application is as follows: an explosion-proof pressure relief structure, comprising a box body, a cover body and a plurality of fastening components, the cover body being fastened and installed on the box body by the fastening components, and through uneven arrangement of the fastening components or different fastening capacities of the fastening components, a pressure relief zone with smaller fastening force than other zones is formed in part of the cover body, and the pressure relief zone is adapted to be deformed and lifted when the pressure inside the box body exceeds a set value.

[0006] Preferably, the pressure relief zone is formed at at least one corner position of the cover body.

[0007] Preferably, the pressure relief zone is formed at two corner positions on the same side of the cover body.

[0008] Preferably, the fastening components include at least one first fastening component and at least one second fastening component, the first fastening component being installed at a corner position of the cover body, and the fastening capacity of the first fastening component being smaller than that of the second fastening component, so that the corner position of the cover body forms the pressure relief zone.

[0009] Preferably, the edge of the box body is provided with a flange extending outward, and the cover body is installed on the flange by the fastening components; the installation position of the fastening components is close to one side of the box body, and the cover body and the flange are spaced apart to form a pressure guide gap.

[0010] Preferably, the cover and the flange are provided with aligned through holes; the first fastening assembly includes a screw and a deformation nut; the deformation nut is installed on the side of the flange away from the cover, and the screw passes through the through holes on the cover and the flange in sequence to be fastened to the deformation nut.

[0011] Preferably, the cover and the flange are provided with aligned through holes; the second fastening assembly includes a screw, a reinforcing plate and a deformation nut; the reinforcing plate is fixedly installed on the side of the flange away from the cover, and the deformation nut is installed on the side of the reinforcing plate away from the flange; the reinforcing plate is provided with a through hole aligned with the through hole, and the screw passes through the through hole and the through hole in sequence to engage with the deformation nut for a fastening connection.

[0012] Preferably, the middle part of the reinforcing plate is protruding away from the flange, the reinforcing plate is fixedly installed to the flange on both sides, and the deformation nut is fixedly installed in the middle part of the protrusion of the reinforcing plate.

[0013] Preferably, the deformation nut is a press-fit nut or a pull-fit nut.

[0014] A power device comprising the aforementioned explosion-proof pressure relief structure.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] This application creates a pressure relief zone with strong deformation capacity by varying the fastening force between the cover and the box at different locations. This ensures a reliable connection between the cover and the box when the internal pressure is low. When the internal pressure exceeds a set value, the deformation of the pressure relief zone creates a pressure relief port to connect the inside of the box with the external environment, thereby achieving the function of pressure relief. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structural layout of this application.

[0018] Figure 2 This is a simplified structural diagram of the present application in a depressurized state.

[0019] Figure 3 This is a schematic diagram of the installation structure of one example of the first fastening component in this application.

[0020] Figure 4 This is a schematic diagram of the installation structure of another example of the first fastening component in this application.

[0021] Figure 5 This is a schematic diagram of the installation structure of the second fastening component in this application.

[0022] Figure 6 This is a schematic diagram of the installation structure of the reinforcing plate and the rivet nut in this application.

[0023] In the diagram: housing 100, flange 110, pressure guide gap 120, protrusion 130, cover 200, pressure relief area 300, pressure relief port 301, first fastening assembly 410, screw 401, spring washer 402, flat washer 403, press rivet nut 404, pull rivet nut 405, reinforcing plate 406, second fastening assembly 420. Detailed Implementation

[0024] The present application will now be further described in conjunction with specific embodiments. It should be noted that, in the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0025] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0030] One aspect of this application provides an explosion-proof pressure relief structure, such as Figure 1 and Figure 2As shown, one preferred embodiment includes a housing 100, a cover 200, and multiple fastening components. The cover 200 is fastened to the housing 100 via the fastening components, creating a sealed space inside the housing 100 for mounting power devices. When the cover 200 is connected to the housing 100 via the fastening components, the uneven arrangement or different fastening capacities of the fastening components create pressure relief zones 300 in certain areas of the cover 200 where the fastening force is less than in other areas. When the power device is operating normally, the pressure inside the housing 100 is lower than a set pressure value. At this time, the cover 200 can be reliably and stably connected to the housing 100 via the fasteners to form a sealed structure, thereby preventing dust and other contaminants from entering the interior of the housing 100. When the power equipment malfunctions and causes the internal pressure of the enclosure 100 to exceed the set value, the cover 200 will be squeezed by the internal pressure of the enclosure 100. Due to the weak fastening force at the pressure relief area 300, the cover 200 will deform and lift up at the position corresponding to the pressure relief area 300. As a result, the cover 200 at the position of the pressure relief area 300 will form a pressure relief port 301 connecting to the external environment with the enclosure 100, thereby allowing the internal pressure of the enclosure 100 to be discharged to the outside through the pressure relief port 301, which can effectively prevent the power equipment from exploding due to internal pressure accumulation.

[0031] It is understandable that the traditional installation method of the cover 200 generally uses fastening components with the same fastening capacity to be installed evenly along the edge. This means that when the power equipment generates internal high pressure due to abnormal operation, the ability of each position on the edge of the cover 200 to resist deformation tends to be consistent, and the cover 200 will expand as a whole until it explodes.

[0032] In the technical solution of this application, by arranging the installation positions of the fastening components or setting the fastening capacity of the fastening components, the deformation resistance of different positions on the edge of the cover 200 varies, with the position with weaker deformation resistance being the pressure relief zone 300. Therefore, when the power equipment generates internal high pressure due to abnormal operation, the pressure exerted on all positions on the edge of the cover 200 is uniform, but the pressure relief zone 300 has poor deformation resistance. Consequently, the pressure relief zone 300 will deform and lift up before other positions, creating a pressure relief port 301 in the pressure relief zone 300 that connects the interior of the housing 100 to the outside. The high pressure inside the housing 100 will then be discharged to the outside through the pressure relief port 301, thereby reducing the pressure on other positions of the cover 200 and achieving explosion-proof protection for the power equipment.

[0033] It should be noted that the cover 200 and the box 100 are generally installed at the edge by fastening components, so the pressure relief zone 300 is also located at the edge of the cover 200.

[0034] In this embodiment, the cover 200 is generally rectangular in shape. The pressure relief area 300 can be located at the middle of the side of the cover 200 or at a corner of the cover 200. Considering that the pressure relief area 300 needs to deform and lift up during pressure relief, the middle of the side of the cover 200 is often subject to poor deformation due to the installation of the fastening components at both ends, while the corner of the cover 200 is more prone to deformation due to its location characteristics. Therefore, in this application, the pressure relief area 300 is preferably located at the corner of the cover 200.

[0035] It should be understood that the number of pressure relief zones 300 is at least one, meaning that a pressure relief zone 300 can be formed at at least one corner of the cover 200. The specific number of pressure relief zones 300 can be selected according to the actual needs of those skilled in the art. For example... Figure 2 As shown, in this embodiment, the number of pressure relief zones 300 is preferably two; the two pressure relief zones 300 can be arranged diagonally or at the corners on the same side of the cover 200. If the pressure relief zones 300 are arranged diagonally on the cover 200, when the power equipment generates internal high pressure due to an abnormality, the resultant force of the pressure relief impact generated by the cover 200 through diagonal pressure relief will still be in the direction away from the housing 100, and there is still a risk that the cover 200 may detach and fly out. By placing the pressure relief zones 300 at both ends of the same side of the cover 200, when the pressure relief zones 300 are depressurized, the resultant force of the pressure relief impact on the cover 200 will cause the cover 200 to flip to the opposite side. This can effectively reduce the probability of the cover 200 being thrown out by the impact, thereby improving the pressure relief safety. Therefore, in this embodiment, the two pressure relief zones 300 are preferably placed at two corner positions on the same side of the cover 200, that is, the two pressure relief zones 300 are placed at any two adjacent corner positions of the cover 200.

[0036] In this embodiment, as described above, there are two main ways in which the cover 200 can form a pressure relief zone 300 through the installation of fastening components. One method involves arranging the fastening components unevenly. In this case, the fastening force is weaker at locations where the fastening components are sparsely installed, thus forming the required pressure relief zone 300 in those areas. The other method involves setting the fastening capacity of the fastening components differently. This means that when the cover 200 is installed on the housing 100 using evenly distributed fastening components, the fastening force at locations where the fastening components with weaker fastening capacity are installed is also weaker, thus forming the required pressure relief zone 300 at those locations.

[0037] It is understandable that, in the first method of forming the pressure relief zone 300, the uneven arrangement of the fastening components is not only aesthetically pleasing, but may also lead to unstable connection of the cover 200 during normal operation of the power equipment. Therefore, in this embodiment, the latter method is preferred for forming the pressure relief zone 300; for ease of understanding, a detailed description will follow.

[0038] Specifically, such as Figure 1 As shown, the fastening assembly includes at least one first fastening assembly 410 and at least one second fastening assembly 420. The first fastening assembly 410 is installed at the corner of the cover 200, and the fastening capacity of the first fastening assembly 410 is less than that of the second fastening assembly 420, so that the corner of the cover 200 forms a pressure relief zone 300 through the installation of the first fastening assembly 410.

[0039] It is understandable that the specific number of the first fastening assembly 410 and the second fastening assembly 420 can be selected based on the specific number and location of the pressure relief zone 300. For example... Figure 1 As shown, when the two pressure relief zones 300 are located at two corners on the same side of the cover 200, there are four first fastening components 410 and eight second fastening components 420. The four first fastening components 410 can be divided into two groups, with each group positioned at one of the two adjacent corners of the cover 200. Each group has two first fastening components 410 positioned on the adjacent sides forming the corresponding corner. Correspondingly, four of the eight second fastening components 420 are also installed at the other two corners of the cover 200 to ensure symmetrical fastening structures at the four corners. Since the cover 200 is generally rectangular, to ensure reliable connection along its long sides, two additional second fastening components 420 can be used to connect it to the housing 100 at the middle of each long side.

[0040] It should be understood that, in order to ensure the reliability of the connection between the cover 200 and the box 100, traditional connection methods often place the fastening components on the square line of the corner of the cover 200. This means that when the cover 200 is depressurized, the first fastening component 410, through its own fastening force, initially restricts the release of pressure, requiring the pressure to be released from the areas on both sides of the first fastening component 410. This results in a weaker pressure relief capacity of the pressure relief zone 300. However, by placing the first fastening component 410 on both sides of the corner, the pressure relief zone 300 can smoothly deform to achieve pressure relief as soon as the pressure inside the box 100 exceeds the limit, thus ensuring that the pressure inside the box 100 is released immediately. Therefore, in this embodiment, it is preferable to place the first fastening component 410 on both sides of the corner.

[0041] In this embodiment, as Figures 3 to 5 As shown, the edge of the housing 100 is provided with an outwardly extending flange 110, and the cover 200 is installed on the flange 110 by a fastening assembly. On the side of the fastening assembly near the housing 100, the cover 200 and the flange 110 are spaced apart to form a pressure-conducting gap 120. Thus, when the internal pressure of the housing 100 exceeds the limit due to abnormal operation of the power equipment, the pressure can be directly applied to the fastening assembly through the pressure-conducting gap 120, thereby ensuring that the pressure relief area 300 can quickly deform and tilt upwards.

[0042] Understandably, the enclosure 100 of power equipment is generally quite thin, making it inconvenient to install fastening components. Therefore, the enclosure 100 uses an extended flange 110 to connect with the fastening components to facilitate installation with the cover 200. To facilitate installation, the flange 110 is typically quite long. If the cover 200 remains tightly pressed against the flange 110 after connection, then when the internal pressure of the enclosure 100 exceeds the limit, the pressure needs to first separate the cover 200 from the flange 110 before it can act on the first fastening component 410 to lift the pressure relief zone 300. This will lead to a delay in pressure relief, thereby increasing the risk of explosion due to excessive internal pressure in the enclosure 100. Therefore, when installing the cover 200 in this embodiment, the cover 200 and the inner area of ​​the flange 110 are directly spaced to form a pressure-guiding gap 120, so that when the internal pressure of the box 100 exceeds the limit, the pressure can be directly applied to the first fastening component 410 to quickly achieve the deformation and lifting of the pressure relief area 300.

[0043] In this embodiment, as Figures 3 to 5 As shown, a protrusion 130 is provided on the inner side of the flange 110. The protrusion 130 enables the cover 200 and the flange 110 to be positioned together, thereby ensuring that the corresponding installation positions of the cover 200 and the flange 110 are quickly aligned. At the same time, the protrusion 130 also ensures that the size of the pressure guide gap 120 formed between the cover 200 and the flange 110 is stable, preventing the pressure guide gap 120 from decreasing due to compression or other reasons.

[0044] In this embodiment, the first fastening component 410 capable of achieving the above-mentioned functions has various specific structures. For ease of understanding, a detailed description of the specific structures will be provided below. For example... Figure 3 and Figure 4As shown, aligned through holes are provided on the cover 200 and the flange 110; the first fastening assembly 410 includes a screw 401 and a deformation nut. The deformation nut is installed on the side of the flange 110 away from the cover 200, and the screw 401 passes through the through holes on the cover 200 and the flange 110 in sequence to fasten the deformation nut. When the internal pressure of the housing 100 exceeds the limit, the cover 200 is driven by the pressure to pull the deformation nut with the screw 401, and the deformation nut then moves the flange 110 closer to the cover 200, so that the flange 110 can adapt to the warping of the pressure relief area 300, so as to ensure that the pressure relief port 301 can be stably formed.

[0045] Understandably, there are various specific structures for deformation nuts that can achieve the above functions, such as... Figure 3 As shown, the deformation nut can be a press-fit nut 404, which can be fixedly installed on the side of the flange 110 away from the cover 200 by press-fitting. For example... Figure 4 As shown, the deformation nut can be a rivet nut 405; the rivet nut 405 can be fixedly installed on the side of the flange 110 away from the cover 200 by riveting. The specific type of deformation nut can be selected according to the actual needs of those skilled in the art.

[0046] In this embodiment, the second fastening component 420 capable of achieving the above-mentioned functions can have various specific structures. To facilitate the installation of the second fastening component 420, a reinforcing plate 406 can be added to the first fastening component 410 to increase its fastening capacity. Specifically, as shown... Figure 5 As shown, the cover 200 and the flange 110 are provided with aligned through holes; the second fastening assembly 420 includes a screw 401, a reinforcing plate 406, and a deformation nut. The reinforcing plate 406 is fixedly installed on the side of the flange 110 away from the cover 200, and the deformation nut is installed on the side of the reinforcing plate 406 away from the flange 110; the reinforcing plate 406 is provided with a through hole aligned with the through hole, and the screw 401 passes through the through hole and the through hole in sequence to engage with the deformation nut for a tight connection. When the internal pressure of the housing 100 exceeds the limit, the cover 200 is driven by the pressure to pull the screw 401 to the deformation nut. The deformation nut can then transmit the pulling force to the flange 110 through the reinforcing plate 406. Since the contact area between the reinforcing plate 406 and the flange 110 is larger than the contact area between the deformation nut and the flange 110, the local stress near the through hole on the flange 110 can be reduced by the reinforcing plate 406. This reduces the tendency of the deformation nut to move closer to the cover 200, thus ensuring the reliability of the connection between the cover 200 and the flange 110.

[0047] It is understandable that the selection of the deformation nut in the second fastening assembly 420 is the same as that in the first fastening assembly 410, so it will not be repeated here. Taking the rivet nut 405 as an example, if the flange 110 is to have the same displacement tendency towards the cover 200 under the compression of the rivet nut 405, due to the presence of the reinforcing plate 406, the tensile force applied by the screw 401 in the second fastening assembly 420 is greater than the tensile force applied by the screw 401 in the first fastening assembly 410. Therefore, the second fastening assembly 420 has a stronger fastening capacity than the first fastening assembly 410.

[0048] It is also understandable that, in order for the deformation nut in the second fastening assembly 420 to stably distribute and transmit the applied force to the flange 110 through the reinforcing plate 406, it is necessary to ensure that the deformation nut never comes into contact with the flange 110 during operation under load. That is, as... Figure 6 As shown, the reinforcing plate 406 can adopt a "V"-shaped structure with a central protrusion away from the flange 110. A deformation nut is then fixedly installed at the central protrusion of the reinforcing plate 406, ensuring a certain distance between the deformation nut and the flange 110. Furthermore, the reinforcing plate 406 has a symmetrical structure, ensuring that when the reinforcing plate 406 is fixed to the flange 110 from both sides, the contact area between the reinforcing plate 406 and the flange 110 remains consistent, thus ensuring the stability of the flange 110 under stress. It should be noted that the specific protrusion height in the center of the reinforcing plate 406 can be set according to the actual needs of those skilled in the art.

[0049] In this embodiment, to ensure the stability of the connection between the screw 401 and the cover 200, both the first fastening assembly 410 and the second fastening assembly 420 further include a spring washer 402 and a flat washer 403. The screw 401 passes through the spring washer 402 and the flat washer 403 in sequence before contacting the cover 200. The spring washer 402 prevents the screw 401 from loosening, and the flat washer 403 increases the contact area between the screw 401 and the cover 200.

[0050] Another aspect of this application provides a power device, such as Figure 1 As shown, one preferred embodiment includes the explosion-proof pressure relief structure described above.

[0051] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof pressure relief structure, characterized by comprising: The box body, the cover body and a plurality of fastening assemblies; the cover body is fastened and installed on the box body through the fastening assemblies; through uneven arrangement of each fastening assembly or different fastening capacity, partial areas of the cover body form pressure relief areas with smaller fastening force than other areas; the pressure relief areas are adapted to be deformed and lifted when the pressure inside the box body exceeds a set value.

2. The explosion relief structure of claim 1, wherein The pressure relief areas are formed at at least one corner position of the cover body.

3. The explosion relief structure of claim 2, wherein The pressure relief areas are formed at two corner positions on the same side of the cover body.

4. The explosion relief structure of claim 2, wherein The fastening assemblies include at least one first fastening assembly and at least one second fastening assembly; the first fastening assembly is installed at a corner position of the cover body, and the fastening capacity of the first fastening assembly is smaller than that of the second fastening assembly, so that the corner position of the cover body forms the pressure relief area.

5. The explosion relief structure according to claim 4, wherein The edge of the box body is provided with a flange extending outward, and the cover body is installed on the flange through the fastening assemblies; the cover body and the flange are spaced apart to form a pressure guide gap at the installation position of the fastening assemblies close to one side of the box body.

6. The explosion relief structure according to claim 5, wherein The cover body and the flange are provided with aligned through holes; the first fastening assembly includes a screw and a deformation nut; the deformation nut is installed on the side of the flange away from the cover body, and the screw is fastened and connected with the deformation nut in sequence through the through holes on the cover body and the flange.

7. The explosion relief structure according to claim 5, wherein The cover body and the flange are provided with aligned through holes; the second fastening assembly includes a screw, a reinforcing plate and a deformation nut; the reinforcing plate is fixedly installed on the side of the flange away from the cover body, and the deformation nut is installed on the side of the reinforcing plate away from the flange; the reinforcing plate is provided with a perforation aligned with the through hole, and the screw is connected and fastened with the deformation nut in sequence through the through hole and the perforation.

8. The explosion relief structure of claim 7, wherein The middle part of the reinforcing plate is protruded away from the flange, the reinforcing plate is fixedly installed on the flange through both sides, and the deformation nut is fixedly installed on the protruded middle part of the reinforcing plate.

9. The explosion relief structure according to claim 6 or 7, wherein The deformation nut is a press-in nut or a pull-in nut.

10. A power device, characterized by The explosion-proof pressure relief structure according to any one of claims 1-9.

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