Pressure relief cover assembly for low voltage electrical cabinet and low voltage electrical cabinet
By designing a pressure relief cover assembly, the problem of rapid pressure relief and protection for low-voltage electrical cabinets during arcing faults was solved, achieving protection that still meets IP requirements after arcing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SCHNEIDER ELECTRIC IND SAS
- Filing Date
- 2025-06-04
- Publication Date
- 2026-06-09
AI Technical Summary
When a low-voltage electrical cabinet experiences an internal arcing fault, the high arcing pressure causes severe damage to the cabinet and internal components. At the same time, the existing pressure relief structure cannot meet the IP requirements after the arcing.
Design a pressure relief cover assembly, including a cover plate, a guide post, and a limiting member. The cover plate slides along the guide post to relieve pressure under arc pressure, and the limiting member restricts the sliding stroke to ensure that the gap after pressure relief is within a preset range and meets IP requirements.
It enables rapid pressure relief of low-voltage electrical cabinets in the event of an arcing fault, reducing damage to the cabinet and components, and meeting post-arcing IP requirements to ensure protection level.
Smart Images
Figure CN224342814U_ABST
Abstract
Description
Technical Field
[0001] The embodiments disclosed herein relate to the field of electrical equipment technology, and particularly to a pressure relief cover assembly for a low-voltage electrical cabinet and a low-voltage electrical cabinet. Background Technology
[0002] Low-voltage electrical cabinets are widely used in various industries as devices for controlling, protecting, and monitoring low-voltage power systems. Internal arcing faults in low-voltage electrical cabinets are one of the most common and dangerous accidents in power systems. When an internal arcing fault occurs, high-temperature and high-pressure gas is generated instantaneously, resulting in high arcing pressure inside the cabinet, which can easily cause serious damage to the cabinet itself and its internal components. Utility Model Content
[0003] In a first aspect of this disclosure, a pressure relief cover assembly for a low-voltage electrical cabinet is provided, comprising: a cover plate adapted to close a pressure relief port on the cabinet body of the low-voltage electrical cabinet, wherein the cover plate is provided with a plurality of first holes arranged to surround the pressure relief port; and a plurality of guide posts, each of the plurality of guide posts including: a connecting end and a limiting end opposite to each other, wherein the connecting end is adapted to connect to the cabinet body, and the limiting end is provided with a limiting element; and a guide portion located between the connecting end and the limiting end, and the guide portion cooperating with a corresponding first hole among the plurality of first holes to allow the cover plate to slide along the guide portion when subjected to an arcing pressure impact, and the sliding stroke of the cover plate is limited by the limiting element.
[0004] In some embodiments, at least a portion of the guide posts are fitted with springs, which are clamped between the limiting member and the cover plate.
[0005] In some embodiments, the limiting member includes a retaining ring, which is fixed to the limiting end of the guide post by a first fastener; and / or the connecting end of the guide post includes an axially extending stud section adapted to pass through a second hole in the cabinet to be connected to a fastening nut inside the cabinet.
[0006] In some embodiments, at least a portion of the guide post has a one-piece limiting structure.
[0007] In some embodiments, a sealing structure is provided between the cover plate and the cabinet, and the sealing structure is arranged around the pressure relief port.
[0008] In some embodiments, the sliding stroke of the cover plate is no more than 45 mm.
[0009] In some embodiments, the pressure relief cover assembly further includes a baffle adapted to connect to the cabinet, at least a portion of the edge of the cover corresponds to the baffle and a gap is formed between the baffle and the cover, and the height of the baffle is greater than the sliding stroke of the cover, and the height direction of the baffle is parallel to the sliding direction of the cover.
[0010] In some embodiments, the cover plate includes a body portion and a plurality of fixing portions connected to the body portion, wherein a plurality of first holes are provided on the body portion, and the plurality of fixing portions are adapted to be connected to the cabinet by a plurality of second fasteners, and the connection between the body portion and the plurality of fixing portions is capable of being disconnected when the cover plate is subjected to an arc pressure impact.
[0011] In some embodiments, at least a portion of the fixing portions forms a gap between the edge of the fixing portion and the adjacent edge of the body portion, and the edge of each fixing portion is connected to the adjacent edge of the body portion through at least one breakable portion.
[0012] In a second aspect of this disclosure, a low-voltage electrical cabinet is provided, including a cabinet body and a pressure relief cover assembly according to a first aspect of this disclosure, wherein at least one of the side panel and the top panel of the cabinet body is provided with a pressure relief port.
[0013] In embodiments according to this disclosure, when an arcing failure occurs inside the cabinet, the cover plate can slide along multiple guide posts under the impact of the arcing pressure, opening the pressure relief port to communicate with the outside, thereby allowing rapid pressure relief of the arcing pressure. After pressure relief is completed, even if the cover plate cannot return to its original position to completely close the pressure relief port, the gap between the cover plate and the cabinet can be limited within a preset range by the action of the limiting member, thereby meeting the IP requirements after an arcing failure.
[0014] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description
[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:
[0016] Figure 1 A perspective view of a pressure relief cover assembly for a low-voltage electrical cabinet according to some embodiments of the present disclosure is shown;
[0017] Figure 2 A perspective view of a low-voltage electrical cabinet according to some embodiments of the present disclosure is shown, which has Figure 1 The pressure relief cover assembly is shown, and the pressure relief port is closed by the cover plate;
[0018] Figure 3 It shows Figure 1 A cross-sectional view of one of the guide pillars in a series of guide pillars;
[0019] Figure 4It shows Figure 1 A partial schematic diagram of the cover plate;
[0020] Figure 5 It shows Figure 2 Another three-dimensional schematic diagram of the low-voltage electrical cabinet is shown, in which the cover plate has been opened to release pressure.
[0021] Figure 6 It shows Figure 5 A schematic diagram of a portion of the top plate and pressure relief cover assembly of a low-voltage electrical cabinet;
[0022] Figure 7 It shows Figure 6 A schematic diagram of a modified embodiment of the top plate of the low-voltage electrical cabinet and the pressure relief cover assembly;
[0023] Figure 8 A perspective view of a pressure relief cover assembly for a low-voltage electrical cabinet according to some other embodiments of the present disclosure is shown;
[0024] Figure 9 It shows Figure 8 A cross-sectional view of one of the guide pillars in a series of guide pillars;
[0025] Figure 10 A perspective view of a pressure relief cover assembly for a low-voltage electrical cabinet according to further embodiments of the present disclosure is shown; and
[0026] Figure 11 A perspective view of a low-voltage electrical cabinet according to some embodiments of the present disclosure is shown, which has Figure 10 The pressure relief cover assembly is shown, and the pressure relief port is closed by the cover plate. Detailed Implementation
[0027] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.
[0028] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.
[0029] As described above, when a low-voltage electrical cabinet experiences an internal arcing fault, it instantly generates high-temperature, high-pressure gas, resulting in significant arcing pressure within the cabinet. In some embodiments, the low-voltage electrical cabinet strengthens its structure to resist the arcing pressure during an arcing fault; however, the arcing pressure and conductive particles generated by the arc can severely damage the cabinet itself and its internal components. In some embodiments, a pressure relief port is provided on the top plate of the low-voltage electrical cabinet, which is sealed by a cover plate pivotally connected to the top plate. When an arcing fault occurs, the cover plate is impacted by the arcing pressure and rotates a large angle (even close to 180 degrees) around its pivot to allow rapid pressure relief of the arcing pressure inside the cabinet. However, after pressure relief, the cover plate may fail to return to its original position, causing the pressure relief port to be completely exposed, resulting in the low-voltage electrical cabinet failing to meet the IP (Ingress Protection) requirements after an arcing fault (e.g., after an arcing test on the low-voltage electrical cabinet).
[0030] Embodiments of this disclosure provide a low-voltage electrical cabinet 100 and its pressure relief cover assembly. The low-voltage electrical cabinet 100 can quickly relieve pressure in the event of an arcing fault and also meet the IP requirements after an arcing fault occurs. The following will be combined with... Figures 1 to 11 The principles of this disclosure are described.
[0031] Figure 1 A perspective view of a pressure relief cover assembly for a low-voltage electrical cabinet 100 according to some embodiments of the present disclosure is shown. The low-voltage electrical cabinet 100 may be, but is not limited to, a low-voltage switchgear or a low-voltage distribution cabinet. Figure 2 The application is shown. Figure 1 The diagram shows a three-dimensional view of a low-voltage electrical cabinet 100 with a pressure relief cover assembly, wherein the pressure relief port 101 on the cabinet body 10 of the low-voltage electrical cabinet 100 is closed by the cover plate 20 of the pressure relief cover assembly. Figure 3 A cross-sectional view of one of the guide posts 30 of the pressure relief cover assembly is shown. Figure 4 A partial schematic diagram of the cover plate 20 of the pressure relief cover assembly is shown. Figure 5 Another perspective view of a low-voltage electrical cabinet 100 with the pressure relief cover assembly is shown, wherein the cover 20 has the pressure relief port 101 opened. Figure 6 It shows Figure 5 A schematic diagram of a portion of the top plate 12 and the pressure relief cover assembly of the low-voltage electrical cabinet 100.
[0032] See Figure 1 and Figure 2 In some embodiments, the low-voltage electrical cabinet 100 includes a cabinet body 10 and a pressure relief cover assembly (not labeled in the figure). The pressure relief cover assembly may include a cover plate 20, a plurality of guide posts 30, and a limiting member 40.
[0033] The cabinet 10 of the low-voltage electrical cabinet 100 includes a base plate (not labeled in the figure), side plates 11 supported by the base plate, and a top plate 12 located on top of the side plates 11. The side plates 11 may include, for example, a left side plate, a right side plate, and a rear side plate. Pressure relief vents 101 may be selectively provided on the side plates 11 and the top plate 12. Figure 1 In the example shown, the pressure relief port 101 is provided on the top plate 12. The pressure relief port 101 may be rectangular, for example.
[0034] See Figures 1 to 3 as well as Figure 5 The cover plate 20 is located outside the cabinet 10 and is used to close the pressure relief port 101. The cover plate 20 can be made of low-cost sheet metal. The cover plate 20 may be provided with a plurality of first holes 201, which are arranged around the pressure relief port 101. In some embodiments, the number of first holes 201 is not less than two.
[0035] See Figure 3 In some embodiments, each of the plurality of guide posts 30 includes a connecting end 31 and a limiting end 32 opposite to each other, and a guide portion 33 located between the connecting end 31 and the limiting end 32. Each guide post 30 is, for example, perpendicular to the top plate 12. The connecting end 31 is located at the lower end of the guide post 30 and is adapted to be connected to the cabinet 10 by any suitable means. The limiting end 32 is located at the upper end of the guide post 30 and is adapted to be connected to the limiting member 40 by any suitable means. In some embodiments, the limiting member 40 is attached to the limiting end 32 of the guide post 30. In some alternative embodiments, the limiting member 40 may be integrally formed with the guide post 30. The guide portion 33 mates with a corresponding first hole 201 of a plurality of first holes 201 to allow the cover plate 20 to slide along the guide portion 33. The location and number of the plurality of first holes 201 can be designed as needed to facilitate the smoothness of the sliding process of the cover plate 20. The limiting member 40 is used to limit the sliding stroke H of the cover plate 20.
[0036] The following is a brief description of the pressure relief process of the low-voltage electrical cabinet 100 in the above embodiment when an arcing fault occurs.
[0037] See Figure 2 When the low-voltage electrical cabinet 100 is working normally, the cover plate 20 can keep the pressure relief port 101 closed under the action of gravity.
[0038] When an arcing failure occurs inside cabinet 10, a large amount of high-temperature, high-pressure gas is instantly generated inside cabinet 10, resulting in significant arcing pressure within the cabinet. (See also...) Figure 5 and Figure 6Under the impact of arcing pressure, the cover plate 20 can slide along multiple guide posts 30, opening the pressure relief port 101 to communicate with the outside, thus allowing for rapid pressure relief of the arcing. The conductive particles generated by the arcing will be discharged from the cabinet 10 along with the high-temperature, high-pressure gas. This effectively reduces the serious damage caused by arcing pressure and conductive particles to the cabinet 10 itself and its internal components.
[0039] Reference Figure 3 and Figure 6 When the cover plate 20 slides along the multiple guide posts 30 to open the pressure relief port 101, the sliding stroke of the cover plate 20 is limited by the limiting member 40 and will not disengage from the multiple guide posts 30. When the arc pressure decreases or the pressure relief is completed, the cover plate 20 can slide down along the multiple guide posts 30 under the action of gravity to reclose the pressure relief port 101, avoiding a large gap between the cover plate 20 and the top plate 12.
[0040] It should be noted that after the pressure relief is completed, even if the cover plate 20 cannot return to its original position to completely close the pressure relief port 101, the gap between the cover plate 20 and the top plate 12 can be limited within a preset range under the action of the limiting member 40, thereby meeting the IP requirements after an arcing failure, such as meeting the IP1X requirement. This disclosure does not limit whether the cover plate 20 can return to its original position to completely close the pressure relief port 101 after an arcing failure occurs.
[0041] In some embodiments, the sliding stroke H of the cover plate 20 is less than 50 mm, so that the gap between the cover plate 20 and the top plate 12 is no greater than 50 mm during and after the pressure relief process, thereby meeting the IP1X requirement. In some embodiments, the sliding stroke H of the cover plate 20 is, for example, less than 49 mm, 48 mm, 47 mm, 46 mm, 45 mm, 44 mm, 43 mm or smaller. In some embodiments, the sliding stroke H of the cover plate 20 can also take into account the possible deformation of the cover plate 20, so as to meet the requirement that even if the cover plate 20 undergoes local deformation, the maximum gap between the cover plate 20 and the top plate 12 can be controlled within 50 mm or within 45 mm, thereby meeting the IP1X requirement. In some embodiments, the sliding stroke H of the cover plate 20 is designed to be about 45 mm, so that while meeting the IP1X requirement, the gap between the cover plate 20 and the top plate 12 is large enough when the cover plate 20 slides to its maximum sliding stroke under the impact of arc pressure, to ensure effective pressure relief.
[0042] See Figure 3 The diagram illustrates a schematic embodiment of the guide post 30 and the limiting member 40.
[0043] In some embodiments, the top plate 12 of the cabinet 10 is provided with a plurality of second holes 102 corresponding to a plurality of first holes 201. The connecting end 31 of the guide post 30 includes an axially extending stud section 311, which enters the interior of the cabinet 10 through the corresponding second hole 102 and is connected to a fastening nut (not shown in the figure), thereby detachably mounting the connecting end 31 to the top plate 12 of the cabinet 10. Of course, in some alternative embodiments, the connecting end 31 can be connected to the corresponding position of the cabinet 10 in other ways.
[0044] In some embodiments, a central hole (not labeled) is provided on the end face of the limiting end 32 of the guide post 30. The limiting member 40 includes a retaining ring that can abut against the end face of the limiting surface 32. A first fastener (e.g., a screw, not shown in the figure) can pass through the central hole of the retaining ring and be detachably connected to the central hole on the end face of the limiting end 32, thereby fixing the retaining ring 32 to the limiting end 32.
[0045] Of course, in some alternative embodiments, the limiting member 40 can be implemented in different ways and is not limited to the retaining ring. For example, the limiting member 40 on at least a portion of the guide posts 30 can be a one-piece structure. In some embodiments, the one-piece limiting member 40 can be, for example, strip-shaped or frame-shaped, and can be fixed to the limiting ends 32 of two or more guide posts 30 by two or more first fasteners.
[0046] In some embodiments, a sealing structure (not shown in the figure) is provided between the cover plate 20 and the cabinet 10. The sealing structure is arranged around the pressure relief port 101 to improve the waterproof and dustproof capability of the low-voltage electrical cabinet 100 during normal operation. The sealing structure can be formed by attaching a sealing strip between the cover plate 20 and the cabinet 10. Of course, the implementation of the sealing structure is not limited to the above example, as long as it can achieve a sealing effect between the cover plate 20 and the cabinet 10.
[0047] See Figure 1 and Figure 2 , Figure 4 and Figure 5 In some embodiments, the cover plate 20 may include a body portion 21 and a plurality of fixing portions 22 connected to the body portion 21. The plurality of fixing portions 22 may, for example, be provided at the edge of the body portion 21. A plurality of first holes 201 are provided on the body portion 21. The plurality of fixing portions 22 may be detachably connected to corresponding positions of the cabinet 10 by a plurality of second fasteners passing through the holes 220, and the connection between the plurality of fixing portions 22 and the body portion 21 may be broken when the cover plate 20 is subjected to arc pressure impact. The cover plate 20 may be a one-piece molded sheet metal part.
[0048] See Figure 2When no arcing fault occurs in the low-voltage electrical cabinet 100, the cover plate 20 not only seals the pressure relief port 101 under gravity, but also reliably seals it through the connection between multiple fixing parts 22 and the top plate 12. In the event of an arcing fault, the arcing pressure is sufficient to disconnect the connection between the multiple fixing parts 22 and the top plate 12, and the body part 21 slides along multiple guide posts 30 to open the pressure relief port 101 without affecting pressure relief. The multiple fixing parts 22 are retained on the top plate 12 of the cabinet 10 by second fasteners. Thus, when the gas pressure inside the cabinet 10 is insufficient, the pressure relief port 101 will not be opened, which helps improve the IP protection level of the low-voltage electrical cabinet 100 during normal operation. However, when an arcing fault occurs inside the cabinet 10, the pressure relief port 101 can be opened without affecting pressure relief. In addition, when the cover plate 20 is connected to the top plate 12 by multiple fixing parts 22, the low-voltage electrical cabinet 100 can meet higher IP requirements, such as IP54 requirements, by providing a sealing structure arranged around the pressure relief port 101 between the body part 21 of the cover plate 20 and the top plate 12.
[0049] Figure 4 The diagram illustrates a schematic connection between the body portion 21 and a plurality of fixing portions 22. In some embodiments, at least a portion of the fixing portions 22 forms a gap 203 between its edge and the adjacent edge of the body portion 21, and the edge of each fixing portion 22 can be connected to the adjacent edge of the body portion 21 via at least one breakable portion 23. The breakable portion 23 may be a strip-shaped portion with relatively weak structural strength. When an arcing failure occurs inside the cabinet 10, the body portion 21 applies a shear force to the breakable portion 23 under the impact of the arcing pressure, causing the breakable portion 23 to break. Of course, there may be other connection methods between the body portion 21 and the plurality of fixing portions 22, as long as the corresponding effects described above are achieved.
[0050] See Figure 7 In some embodiments, the pressure relief cover assembly may further include a baffle 60. The baffle 60 is adapted to connect to a suitable location on the cabinet 10. At least a portion of the edge of the cover 20 corresponds to the baffle 60, and a gap is formed between the baffle 60 and the cover 20. The height of the baffle 60 is greater than the sliding stroke H of the cover 20, and the height direction of the baffle 60 is parallel to the sliding direction of the cover 20. By providing the baffle 60, the direction of the high-pressure gas ejected from the pressure relief port 101 can be changed as needed to avoid adverse effects on some devices located outside the cabinet 10.
[0051] Figure 8 A perspective view of a pressure relief cover assembly for a low-voltage electrical cabinet 100 according to some other embodiments of the present disclosure is shown. Figure 9 It shows Figure 8 A cross-sectional view of one of the guide pillars 30 among the multiple guide pillars 30. Figure 8The pressure relief cover assembly shown is... Figure 1 The pressure relief cover assembly shown has a similar structure, and in the absence of conflict, Figure 8 The structure of the pressure relief cover assembly shown can be referenced in the above text. Figure 1 The description of the pressure relief cover assembly shown below will detail the differences between the two.
[0052] See Figure 8 and Figure 9 In some embodiments, at least a portion of the guide post 30 may be fitted with a spring 50 (the spring 50 is in... Figure 8 and Figure 9 (Illustrated schematically with solid or dashed lines), spring 50 is clamped between limiting member 40 and cover plate 20. Spring 50 applies elastic force to cover plate 20 to keep cover plate 20 closed to the pressure relief port 101. In addition, by providing a sealing structure arranged around pressure relief port 101 between the body portion 21 and top plate 12 of cover plate 20, low-voltage electrical cabinet 100 can meet higher IP requirements, such as IP54 requirements. When the connection between body portion 21 and multiple fixing parts 22 is broken due to arcing pressure impact on cover plate 20, spring 50 is compressed. After pressure relief is completed, spring 50 can push body portion 21 of cover plate 20 to automatically reset to close pressure relief port 101, in order to better meet IP requirements after an arcing failure.
[0053] Figure 10 A perspective view of a pressure relief cover assembly for a low-voltage electrical cabinet 100 according to further embodiments of the present disclosure is shown. Figure 11 The application is shown. Figure 10 The diagram shows a three-dimensional view of a low-voltage electrical cabinet 100 with a pressure relief cover assembly, wherein the pressure relief port 101 on the cabinet body 10 of the low-voltage electrical cabinet 100 is closed by the cover plate 20 of the pressure relief cover assembly. Figure 10 The pressure relief cover assembly shown is... Figure 8 The pressure relief cover assembly shown has a similar structure, and in the absence of conflict, Figure 10 The structure of the pressure relief cover assembly shown can be referenced in the above text. Figure 8 The description of the pressure relief cover assembly shown below will detail the differences between the two.
[0054] See Figure 10In some embodiments, the cover plate 20 may not have multiple fixing parts 22. By providing an appropriate number of guide posts 30 with springs 50, it can be ensured that the cover plate 20 reliably closes the pressure relief port 101 during normal operation of the low-voltage electrical cabinet 100, and also meet the need to open the pressure relief port 101 for pressure relief in the event of an arcing fault. In addition, by providing a sealing structure arranged around the pressure relief port 101 between the cover plate 20 and the side plate 11, the low-voltage electrical cabinet 100 can meet higher IP requirements, such as IP54 requirements.
[0055] In some embodiments, Figure 11 The pressure relief cover assembly shown can also be used to close the pressure relief port 101 on the top plate 11. Figure 1 and Figure 8 The pressure relief cover assembly shown can also be used to seal the pressure relief port 101 on the side panel 11. Embodiments of this disclosure do not limit the height of the pressure relief port 101 on the side panel 11. The pressure relief port 101 can, for example, be located near an area prone to arcing failure, so that the high-temperature, high-pressure gas generated when an arcing failure occurs inside the cabinet can be quickly discharged through the pressure relief port 101.
[0056] Figure 8 and Figure 10 The pressure relief cover assembly shown, equipped with spring 50, allows the cover plate 20 to automatically reset and re-close the pressure relief port 101 after an arcing failure occurs. This is particularly suitable for low-voltage electrical cabinets 100 where the pressure relief port 101 is located on the side plate 11 and its height is no more than 2m. The pressure relief cover assembly mounted on the side plate 11 can also be equipped with the baffle 60 mentioned above to change the direction of high-pressure gas ejected from the pressure relief port 101.
[0057] In the embodiments according to this disclosure, when an arcing fault occurs inside the cabinet 10, the cover plate 20 can slide along multiple guide posts 30 under the impact of the arcing pressure, opening the pressure relief port 101 to communicate with the outside, thereby allowing rapid pressure relief of the arcing pressure. After pressure relief is completed, even if the cover plate 20 cannot return to its original position to completely close the pressure relief port 101, the gap between the cover plate 20 and the side plate 11 or top plate 12 of the cabinet can be limited within a preset range under the action of the limiting member 40, thereby meeting the IP requirements after an arcing fault. The embodiments of this disclosure achieve pressure relief of the low-voltage electrical cabinet 100 after an arcing fault while meeting the IP requirements after an arcing fault through a simple structure and low cost.
[0058] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A pressure relief cover assembly for a low-voltage electrical cabinet, characterized in that, include: A cover plate (20) is adapted to close a pressure relief port (101) on the cabinet (10) of the low-voltage electrical cabinet (100), wherein the cover plate (20) is provided with a plurality of first holes (201) arranged to surround the pressure relief port (101). as well as A plurality of guide posts (30), each of the plurality of guide posts (30) comprising: A connecting end (31) and a limiting end (32) facing each other, wherein the connecting end (31) is adapted to connect to the cabinet (10), and the limiting end (32) is provided with a limiting element (40); and A guide portion (33) is located between the connecting end (31) and the limiting end (32), and the guide portion (33) cooperates with a corresponding first hole (201) among the plurality of first holes (201) to allow the cover plate (20) to slide along the guide portion (33) when subjected to arc pressure impact, and the sliding stroke (H) of the cover plate (20) is limited by the limiting member (40).
2. The pressure relief cover assembly according to claim 1, characterized in that, At least a portion of the guide posts (30) are fitted with springs (50), which are sandwiched between the limiting member (40) and the cover plate (20).
3. The pressure relief cover assembly according to claim 1, characterized in that, The limiting member (40) includes a retaining ring, which is fixed to the limiting end (32) of the guide post (30) by a first fastener; and / or The connecting end (31) of the guide post (30) includes an axially extending stud section (311) adapted to pass through a second hole (102) on the cabinet (10) to be connected to a fastening nut inside the cabinet (10).
4. The pressure relief cover assembly according to claim 1, characterized in that, At least a portion of the guide post (30) has a one-piece limiting member (40).
5. The pressure relief cover assembly according to claim 1, characterized in that, A sealing structure is provided between the cover plate (20) and the cabinet (10), and the sealing structure is arranged around the pressure relief port (101).
6. The pressure relief cover assembly according to claim 1, characterized in that, The sliding stroke (H) of the cover plate (20) is no more than 45 mm.
7. The pressure relief cover assembly according to claim 1, characterized in that, The pressure relief cover assembly also includes a baffle (60) adapted to connect with the cabinet (10), at least a portion of the edge of the cover (20) corresponds to the baffle (60) and a gap is formed between the baffle (60) and the cover (20), and the height of the baffle (60) is greater than the sliding stroke (H) of the cover (20), and the height direction of the baffle (60) is parallel to the sliding direction of the cover (20).
8. The pressure relief cover assembly according to any one of claims 1 to 7, characterized in that, The cover plate (20) includes a body part (21) and a plurality of fixing parts (22) connected to the body part (21). The plurality of first holes (201) are provided on the body portion (21), and The plurality of fixing parts (22) are adapted to be connected to the cabinet (10) by a plurality of second fasteners, and the connection between the body part (21) and the plurality of fixing parts (22) can be broken when the cover plate (20) is subjected to arc pressure impact.
9. The pressure relief cover assembly according to claim 8, characterized in that, At least a portion of the fixing portions (22) form a gap (203) between the edge of the fixing portion (22) and the adjacent edge of the body portion (21), and the edge of each fixing portion (22) is connected to the adjacent edge of the body portion (21) by at least one breakable portion (23).
10. A low-voltage electrical cabinet (100), characterized in that, The cabinet (10) includes a pressure relief cover assembly according to any one of claims 1 to 9, wherein at least one of the side panel (11) and the top panel (12) of the cabinet (10) is provided with the pressure relief port (101).