Pressure relief device for gas-insulated enclosed switchgear

Abstract

The utility model provides a pressure relief device for a gas-insulated enclosed switchgear, and the device comprises a cover plate which is provided with a pressure relief hole for discharging insulating gas; the explosion-proof membrane seals the pressure relief hole; the containing cover is annular, the containing cover and the pressure relief hole are coaxially arranged, the side, facing the cover plate, of the containing cover is provided with a containing groove used for containing an adsorbent, the containing cover is provided with an outer peripheral edge part and an inner peripheral edge part, and the containing cover comprises an annular flange extending outwards in the radial direction from the outer peripheral edge part; a plurality of bases detachably connected to the cover plate; the plurality of pressing caps are detachably connected to the plurality of bases and clamp the annular flange of the accommodating cover together with the plurality of bases so as to connect the accommodating cover to the cover plate; the base separates the cover plate from the outer peripheral edge portion of the accommodating cover to form a circulation gap between the cover plate and the outer peripheral edge portion of the accommodating cover, so that the insulating gas can enter and leave the accommodating groove through the circulation gap. Therefore, the size of the circulation gap can be conveniently adjusted, and the pressure relief device can be suitable for different use scenes.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of power equipment, and in particular relates to a pressure relief device for a gas-insulated enclosed switchgear. Background Art

[0002] Gas-insulated switchgear (GIS) is used to control power transmission in power systems. GIS equipment is filled with an insulating gas (e.g., SF6) to ensure insulation. In the event of a GIS failure, for example, the insulating gas may expand, causing internal pressure to rise. Therefore, a pressure relief device is required on the GIS housing to prevent explosion due to excessive internal pressure.

[0003] Figure 1 is a perspective view schematically showing a pressure relief device for a gas-insulated enclosed switchgear in the prior art, Figure 2 It is schematically shown Figure 1 A side cross-sectional view of the pressure relief device is shown.

[0004] Reference Figure 2 The pressure relief device 10 includes a cover plate 12, an explosion-proof membrane 14 (also known as an explosion-proof disc, bursting disc, explosion relief disc, or safety membrane) and a pressure plate 16. The cover plate 12 is provided with a pressure relief hole 18. The pressure plate 16 fixes the explosion-proof membrane 14 to the cover plate 12 so that the explosion-proof membrane 14 hermetically covers the pressure relief hole 18. The cover plate 12 is hermetically connected to the housing of the GIS equipment, and the explosion-proof membrane 14 separates the pressure relief hole 18 from the internal space of the GIS equipment. When the internal pressure of the GIS equipment reaches a threshold value, the explosion-proof membrane 14 ruptures, allowing the insulating gas to be discharged from the interior of the GIS equipment through the pressure relief hole 18.

[0005] Reference Figure 2 Filler 20 is then filled into pressure relief hole 18 to cover the outer surface of explosion-proof membrane 14. For example, filler 20 may comprise cured silicone. Filler 20 protects explosion-proof membrane 14, preventing it from being intruded by moisture or other foreign matter. This prevents damage to explosion-proof membrane 14 and ensures stable performance.

[0006] Reference Figure 2 The pressure relief device 10 also includes a housing 22 connected to the cover plate 12. The housing 22 is annular and has a receiving groove 24 for accommodating an adsorbent. After the pressure relief device 10 is installed, the housing 22 is located within the internal space of the GIS equipment, allowing the adsorbent to absorb, for example, water vapor and decomposition products generated during power on / off, thereby ensuring the insulation and safety of the GIS equipment.

[0007] Reference Figure 2The cover plate 12 is made of a material with good welding properties, such as steel. Multiple mounting posts 26 are welded to the end surface of the cover plate 12. The outer periphery of the housing cover 22 is fastened to the mounting posts 26 via fasteners. The mounting posts 26 are provided with mounting holes for receiving the fasteners. The position of the mounting holes creates a flow gap 28 between the housing cover 22 and the lower surface of the cover plate 12, allowing insulating gas to enter and exit the housing tank 24 through the flow gap 28.

[0008] Reference Figure 2 The pressure relief device 10 also includes a flow deflector 30, a protective cover 32 and a connecting plate 34. The flow deflector 30 and the protective cover 32 are fixed to the cover plate 12 via the connecting plate 34. The flow deflector 30 is defined by a flow diversion channel 36. The flow diversion channel 36 can be connected to the pressure relief hole 18 when the explosion-proof membrane 14 ruptures, and change the discharge direction of the insulating gas, such as turning the insulating gas 90° so that the discharged insulating gas will not be directly sprayed onto the patrol personnel, thereby preventing the patrol personnel from being injured. The protective cover 32 covers the entire pressure relief hole 18 and accommodates the entire flow deflector 30, which is used to prevent the pressure relief hole 18 and the flow diversion channel 36 from being blocked by foreign objects (for example, branches used by animals to build nests, etc.).

[0009] However, to facilitate welding, both the cover plate 12 and the mounting posts 26 must be made of materials with good weldability. These materials are typically heavy, which increases the weight of the pressure relief device 10. Furthermore, the welding process is complex, increasing the manufacturing cost of the pressure relief device 10. Furthermore, once the mounting posts 26 are welded to the cover plate 12, the size of the flow gap 28 is also determined accordingly, limiting the application scenarios of the pressure relief device 10. Utility Model Content

[0010] To solve the above technical problems, the present disclosure provides a pressure relief device for a gas-insulated closed switchgear, comprising: a cover plate, the cover plate being provided with a pressure relief hole for discharging insulating gas present inside the gas-insulated closed switchgear; an explosion-proof membrane, the explosion-proof membrane sealing the pressure relief hole; a housing cover, the housing cover being annular and arranged coaxially with the pressure relief hole, the housing cover being provided with a housing groove for accommodating an adsorbent on a side facing the cover plate and having an outer peripheral edge portion and an inner peripheral edge portion, the housing cover including an annular flange extending radially outward from the outer peripheral edge portion; a plurality of bases, the plurality of bases being detachably connected to the cover plate; and a plurality of pressing caps, the plurality of pressing caps being detachably connected to the plurality of bases and jointly clamping the annular flange of the housing cover with the plurality of bases to connect the housing cover to the cover plate, wherein the plurality of bases separate the cover plate from the outer peripheral edge portion of the housing cover to form a flow gap between the cover plate and the outer peripheral edge portion of the housing cover, so that insulating gas can enter and leave the housing groove through the flow gap.

[0011] In the present disclosure, by providing a base and a pressure cap, the cover plate eliminates the need for welding, such as mounting posts used in the prior art. This allows the cover plate to be constructed of lighter materials, thereby reducing the weight of the pressure relief device. Furthermore, welding steps are eliminated during the connection of the containment cover to the cover plate, thereby reducing the manufacturing cost of the pressure relief device. Furthermore, by making the base and pressure cap removable, the size of the flow gap can be adjusted by replacing bases of different sizes, making the pressure relief device suitable for different usage scenarios.

[0012] Furthermore, the plurality of bases are screwed to the cover plate, and / or the plurality of pressure caps are screwed to the plurality of bases.

[0013] In the present disclosure, by screwing the base to the cover, the base can be easily and reliably connected to the cover, making the pressure relief device easy to assemble and maintain, and facilitating a stable connection between the cover and the housing. By screwing the pressure cap to the base, the pressure cap can be easily and reliably connected to the base, making the pressure relief device easy to assemble and maintain, and facilitating a stable connection between the cover and the housing.

[0014] Furthermore, the axial direction of the pressure relief hole is perpendicular to the annular flange of the accommodating cover, and the multiple bases and the multiple pressure caps clamp the annular flange of the accommodating cover in the axial direction of the pressure relief hole.

[0015] In the present disclosure, the base and the pressure cap clamp the outer peripheral edge of the accommodating cover in the axial direction of the pressure relief hole, so that the base and the pressure cap can have an easy-to-operate installation angle, thereby facilitating the installation and removal of the accommodating cover.

[0016] Furthermore, the pressure relief device also includes a pressure plate, which has an outer side surface and an inner side surface opposite to each other, and the outer side surface is located outside the inner side surface in the outward direction away from the interior of the gas-insulated enclosed switchgear. The pressure plate and the outer side surface of the cover plate jointly clamp the explosion-proof membrane; the inner peripheral edge portion of the containment cover abuts against the inner side surface of the pressure plate to separate the explosion-proof membrane from the inner peripheral edge portion of the containment cover.

[0017] In the present disclosure, by making the inner peripheral edge of the housing cover abut against the pressure plate, the pressure plate can limit the housing cover, so that the housing cover can be easily positioned in the correct installation position. In addition, the pressure plate and the inner peripheral edge can jointly block the adsorbent in the housing tank from moving toward the explosion-proof membrane, so that the explosion-proof membrane will not be damaged by the adsorbent, thereby improving the reliability of the pressure relief device. Such a configuration is particularly advantageous in environments such as earthquakes that cause equipment vibration. Furthermore, by separating the explosion-proof membrane from the inner peripheral edge of the housing cover, the explosion-proof membrane is not easily damaged by the inner peripheral edge, thereby further improving the reliability of the pressure relief device.

[0018] Furthermore, the cover plate is made of aluminum or aluminum alloy.

[0019] In the present disclosure, by making the cover plate out of aluminum or aluminum alloy, the cover plate can have sufficient mechanical properties while being light in weight, thereby facilitating lightweighting of the pressure relief device.

[0020] Furthermore, the explosion-proof membrane is a reverse-arch explosion-proof membrane.

[0021] In the present disclosure, by using an inverted arch-type explosion-proof membrane instead of a flat-plate explosion-proof membrane in the prior art, the pressure relief device can have a lower cost.

[0022] Furthermore, the pressure relief device also includes a protective film, which covers the pressure relief hole from the outside of the explosion-proof membrane in the outward direction away from the interior of the gas-insulated enclosed switchgear; the protective film includes a first part and a second part, and the protective film is configured to allow gas to pass through the first part in both directions, allow liquid to pass through the first part from the inside to the outside, and hinder liquid from passing through the first part from the outside to the inside, and the protective film is also configured to hinder gas and liquid from passing through the second part.

[0023] In the present disclosure, by providing a protective film, the protective film can prevent the explosion-proof membrane from being invaded by moisture or other foreign matter, so that the pressure relief device can have higher reliability. In addition, by using a protective film instead of the filler in the prior art, the use of chemicals can be reduced, making the manufacturing process of the pressure relief device safer and more environmentally friendly. Furthermore, compared with the filler, the protective film will only break when the explosion-proof membrane breaks and will not pop out like the filler, so as not to cause harm to the inspection personnel, reducing potential safety risks. Furthermore, in some examples, by providing the first part, the protective film can connect the outside of the explosion-proof membrane with the atmosphere, so that the pressure difference fluctuations caused by temperature changes on the explosion-proof membrane are smaller, thereby further improving the reliability of the pressure relief device. Furthermore, in some examples, by using the first part and the second part together, the amount of the first part is smaller, thereby reducing the cost of the pressure relief device.

[0024] Further, the first part is a Gore film, and / or the second part is a metal foil.

[0025] In the present disclosure, with the help of such a first part and a second part, the production process can be made greener and more environmentally friendly.

[0026] Furthermore, the pressure relief device also includes a flow deflector, which is provided with a flow guide channel, and the flow guide channel is configured to receive the insulating gas discharged from the pressure relief hole when the explosion-proof membrane ruptures, change the flow direction of the insulating gas and discharge the insulating gas to the outside of the flow deflector; the flow deflector is connected to the cover plate and clamps the protective membrane together with the cover plate.

[0027] In the present disclosure, the air guide cover and the cover plate jointly clamp the protective film, so that the air guide cover can prevent the protective film from leaving the pressure relief hole, so that the protective film can stably cover the pressure relief hole.

[0028] Furthermore, a plurality of drainage grooves are provided on a surface of the air deflector facing the protective film, and the drainage grooves are configured to connect the air deflector channel with the outside of the air deflector.

[0029] In the present disclosure, by providing a drainage trough, accumulated water in the diversion channel can be promptly drained from the diversion channel through the drainage trough, thereby preventing the protective film from being corroded. Furthermore, in low-temperature conditions such as winter, the drainage trough can prevent accumulated water from freezing in the diversion channel, thereby preventing the diversion channel from being blocked.

[0030] Furthermore, the pressure relief device further includes a protective cover for accommodating the air deflector, and the protective cover is connected to the air deflector and is spaced apart from the cover plate in the outward direction.

[0031] In the present disclosure, the protective cover is provided to prevent the diversion channel from being blocked by foreign objects, such as animals from nesting in the diversion channel, thereby further improving the reliability of the pressure relief device. Furthermore, by connecting the protective cover to the cover plate via the diversion cover, the pressure relief device can eliminate the connecting plate used in the prior art, thereby reducing the number of components and, consequently, the weight of the pressure relief device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0033] Figure 1 is a perspective view schematically showing a pressure relief device for a gas-insulated enclosed switchgear in the prior art;

[0034] Figure 2 yes Figure 1 A side cross-sectional view of the pressure relief device shown;

[0035] Figure 3 is a perspective view schematically showing a pressure relief device for a gas-insulated enclosed switchgear according to the present disclosure;

[0036] Figure 4 yes Figure 3 A side cross-sectional view of the pressure relief device shown;

[0037] Figure 5 and Figure 6 From different perspectives Figure 3 A perspective exploded view of the pressure relief device shown;

[0038] Figure 7 yes Figure 3 A side cutaway exploded view of the pressure relief device is shown;

[0039] Figure 8 yes Figure 3 A perspective view of the deflector cover of the pressure relief device is shown.

[0040] Reference Signs List

[0041] 10 Pressure relief device

[0042] 12 cover

[0043] 14 explosion-proof film

[0044] 16 pressure plates

[0045] 18 pressure relief holes

[0046] 20 fillers

[0047] 22 Container cover

[0048] 24 storage slots

[0049] 26 mounting columns

[0050] 28 circulation gap

[0051] 30 deflector cover

[0052] 32 protective cover

[0053] 34 connecting plate

[0054] 36 diversion channels

[0055] 38 pressure relief device

[0056] 40 cover

[0057] 42 explosion-proof film

[0058] 44 Container cover

[0059] 46 bases

[0060] 48 pressure cap

[0061] 50 pressure relief holes

[0062] 52 storage slots

[0063] 54 outer peripheral part

[0064] 55 annular flange

[0065] 56 circulation gap

[0066] 58 pressure plate

[0067] 60 inner peripheral part

[0068] 62 protective film

[0069] 64 Part 1

[0070] 66 Part 2

[0071] 68 deflector

[0072] 70 diversion channel

[0073] 72 Surface

[0074] 74 drain tank

[0075] 76 protective cover DETAILED DESCRIPTION

[0076] The following will be combined with the accompanying drawings in the embodiments of the present invention to describe the technical solutions in the embodiments of the present invention in detail. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0077] In the following detailed description, reference is made to the accompanying drawings which form a part hereof, in which are shown by way of illustration specific embodiments in which the present invention may be practiced. With respect to the drawings, directional terms such as "top," "bottom," "inside," "outside," "up," "down," "front," "back," and the like are used with reference to the orientation of the drawings being described. Because the components of the embodiments of the present invention can be placed in many different orientations, the directional terms are used for illustration only and are not intended to be limiting. It should be understood that other embodiments may be used and that structural or logical changes may be made without departing from the scope of the present invention. Therefore, the following detailed description should not be construed in a limiting sense, and the present invention is defined by the appended claims.

[0078] Refer to the following Figures 3 to 8 An embodiment of the present disclosure is introduced.

[0079] Reference Figures 3 to 7The present disclosure provides a pressure relief device 38 for a gas-insulated closed switchgear. The pressure relief device 38 may include a cover plate 40, an explosion-proof membrane 42, a housing cover 44, a plurality of bases 46 and a plurality of pressure caps 48. The cover plate 40 is provided with a pressure relief hole 50 for discharging the insulating gas present inside the gas-insulated closed switchgear. The explosion-proof membrane 42 closes the pressure relief hole 50. The housing cover 44 is annular and is arranged coaxially with the pressure relief hole 50. The housing cover 44 is provided with a housing groove 52 for accommodating an adsorbent (not shown in the figure) on the side facing the cover plate 40 and has an outer peripheral edge portion 54 and an inner peripheral edge portion 60. The housing cover 44 includes an annular flange 55 extending radially outward from the outer peripheral edge portion 54. The plurality of bases 46 are detachably connected to the cover plate 40. The plurality of pressure caps 48 are detachably connected to the plurality of bases 46 and, together with the plurality of bases 46, clamp the annular flange 55 of the housing cover 44 to connect the housing cover 44 to the cover plate 40. Specifically, the number of bases 46 is the same as the number of pressure caps 48, and the bases 46 and pressure caps 48 are matched in a one-to-one manner. The bases 46 separate the cover plate 40 from the outer peripheral edge portion 54 of the accommodating cover 44, thereby forming a flow gap 56 between the cover plate 40 and the outer peripheral edge portion 54 of the accommodating cover 44, thereby allowing the insulating gas to enter and exit the accommodating groove 52 through the flow gap 56.

[0080] In the present disclosure, by providing the base 46 and the pressure cap 48, the cover plate 40 does not need to be welded with the mounting post 26 (see FIG. Figure 2 ), allowing the cover plate 40 to be made of a lighter material, thereby reducing the weight of the pressure relief device 38. Furthermore, welding is eliminated during the connection of the containment cover 44 to the cover plate 40, thereby reducing the manufacturing cost of the pressure relief device 38. Furthermore, by making the base 46 and the pressure cap 48 detachable, the size of the flow gap 56 can be adjusted by replacing the base 46 with a different size, making the pressure relief device 38 suitable for different usage scenarios.

[0081] Reference Figures 4 to 7 , the base 46 is screwed to the cover plate 40, and / or the pressure cap 48 is screwed to the base 46. As an example, the base 46 and the pressure cap 48 can be screws. For example, the base 46 can be a so-called male-female screw, which can be screwed to the cover plate 40 through an external thread and screwed to the pressure cap 48 through an internal thread. Of course, the base 46 can also be replaced by a stud screw, etc. As an example, a plurality of bases 46 can be evenly arranged in the circumferential direction of the pressure relief hole 50, and each base 46 corresponds to a pressure cap 48. For example, the number of bases 46 and pressure caps 48 can be three to six, preferably four.

[0082] In the present disclosure, by screwing the base 46 to the cover plate 40, the base 46 can be easily and reliably connected to the cover plate 40, making the pressure relief device 38 easy to assemble and maintain, and facilitating a stable connection between the cover plate 40 and the housing 44. By screwing the pressure cap 48 to the base 46, the pressure cap 48 can be easily and reliably connected to the base 46, making the pressure relief device 38 easy to assemble and maintain, and facilitating a stable connection between the cover plate 40 and the housing 44.

[0083] It should be understood that the base 46 is not limited to being screwed to the cover 40, and the pressure cap 48 is not limited to being screwed to the base 46. For example, in other examples, the base 46 can be snap-fitted to the cover 40, and / or the pressure cap 48 can be snap-fitted to the base 46.

[0084] Reference Figures 4 to 7 The axial direction of the pressure relief hole 50 is perpendicular to the annular flange 55 of the housing cover 44. The plurality of bases 46 and the plurality of pressure caps 48 clamp the annular flange 55 of the housing cover 44 in the axial direction of the pressure relief hole 50. As an example, the axial direction of the pressure relief hole 50 can be perpendicular to the cover plate 40, and the pressure relief hole 50 can be provided in a substantially central portion of the cover plate 40.

[0085] In the present disclosure, the base 46 and the pressure cap 48 clamp the outer peripheral edge 54 of the accommodating cover 44 in the axial direction of the pressure relief hole 50 so that the base 46 and the pressure cap 48 can have an installation angle that is easy to operate, thereby facilitating the installation and removal of the accommodating cover 44.

[0086] Reference Figures 4 to 7 The pressure relief device 38 also includes a pressure plate 58, which has an outer side surface and an inner side surface opposite to each other, and the outer side surface is located on the outside of the inner side surface in the outward direction away from the interior of the gas-insulated closed switchgear. The pressure plate 58 and the outer side surface of the cover plate 40 jointly clamp the explosion-proof membrane 42. The inner peripheral edge portion 60 of the containment cover 44 abuts against the inner side surface of the pressure plate 58 to separate the explosion-proof membrane 42 from the inner peripheral edge portion 60 of the containment cover 44. As an example, the pressure plate 58 can be annular and arranged coaxially with the pressure relief hole 50. As an example, a seal can be provided between the cover plate 40 and the pressure plate 58. For example, a sealing ring can be provided between the explosion-proof membrane 42 and the cover plate 40.

[0087] In the present disclosure, by making the inner peripheral edge portion 60 of the accommodating cover 44 abut against the pressure plate 58, the pressure plate 58 can limit the accommodating cover 44, so that the accommodating cover 44 can be easily positioned to the correct installation position. In addition, the pressure plate 58 and the inner peripheral edge portion 60 can jointly block the adsorbent in the accommodating tank 52 from moving toward the explosion-proof membrane 42, so that the explosion-proof membrane 42 will not be damaged by the adsorbent, thereby improving the reliability of the pressure relief device 38. Such a configuration is particularly advantageous in environments such as earthquakes that cause equipment vibration. Furthermore, by separating the explosion-proof membrane 42 from the inner peripheral edge portion 60 of the accommodating cover 44, the explosion-proof membrane 42 is not easily damaged by the inner peripheral edge portion 60, thereby further improving the reliability of the pressure relief device 38.

[0088] Reference Figures 3 to 7 , the cover plate 40 may be made of aluminum. Alternatively, the cover plate 40 may be made of an aluminum alloy, such as 6082 aluminum alloy.

[0089] In the present disclosure, by making the cover plate 40 include aluminum, the cover plate 40 can have a relatively light weight while having sufficient mechanical properties, thereby facilitating lightweighting of the pressure relief device 38 .

[0090] Reference Figure 4 、 Figure 6 as well as Figure 7 , the explosion-proof membrane 42 is a reverse-arch explosion-proof membrane. In other words, the explosion-proof membrane 42 has an inner side ( Figure 4 The rupture-proof membrane 42 has a curved shape (the lower side of the membrane). Here, "inner side" refers to the side closer to the insulating gas, and correspondingly, "outer side" refers to the side closer to the atmosphere. By way of example, the rupture-proof membrane 42 can be made of metal, such as stainless steel. By way of example, the rupture-proof membrane 42 can have a weakened portion (a thinner portion) so that the membrane 42 splits into multiple petals upon rupture.

[0091] In the present disclosure, the flat plate type explosion-proof membrane in the prior art is replaced by the reverse arch type explosion-proof membrane (see Figure 2 The explosion-proof membrane 14 in the pressure relief device 38 can have a lower cost.

[0092] Reference Figures 4 to 7The pressure relief device 38 also includes a protective film 62 that covers the pressure relief hole 50 from the outside of the explosion-proof membrane 42, in a direction away from the interior of the gas-insulated enclosed switchgear. The protective film 62 includes a first portion 64 and / or a second portion 66. The protective film 62 is configured to allow gas to pass through the first portion 64 in both directions, allow liquid to pass through the first portion 64 from the inside out, and block liquid from passing through the first portion 64 from the outside in. The protective film 62 is also configured to block gas and liquid from passing through the second portion 66 (i.e., blocking gas and liquid from passing through the second portion 66 from the outside in, as well as from the inside out). "Blocking" here can mean prohibiting the passage of gas or liquid components or providing resistance to the passage of gas or liquid. By way of example, the first portion 64 can be a Gore film, and the second portion 66 can be a metal foil. For example, the second portion 66 can be aluminum foil, and the thickness of the second portion 66 can range from 0.2 mm to 0.4 mm, preferably 0.3 mm. As an example, the protective film 62 may be sealingly bonded to the cover plate 40. For example, the protective film 62 may be bonded to the cover plate 40 by a double-sided tape without a substrate.

[0093] As an example, the second portion 66 can be substantially circular and have a through-hole at its center. The first portion 64 can be sealingly bonded to the second portion 66 and cover the through-hole at its center. The first portion 64 does not contact the cover plate 40 but is connected to the cover plate 40 via the second portion 66. Of course, in other examples, the protective film 62 can also be a combination of multiple first portions 64 and one second portion 66. For example, the second portion 66 can have multiple through-holes covered by different first portions 64.

[0094] In the present disclosure, by providing a protective film 62, the protective film 62 can prevent the explosion-proof membrane 42 from being invaded by moisture or other foreign matter, so that the pressure relief device 38 can have a higher reliability. In addition, by using the protective film 62 instead of the filler 20 in the prior art (see Figure 2 ), which can reduce the use of chemicals, making the manufacturing process of the pressure relief device 38 safer and more environmentally friendly. Furthermore, compared to the packing 20, the protective film 62 will only rupture when the explosion-proof membrane 42 ruptures, rather than popping out like the packing 20, thereby preventing harm to inspection personnel and reducing potential safety risks. Furthermore, in some examples, by providing the first portion 64, the protective film 62 can connect the outer side of the explosion-proof membrane 42 to the atmosphere, thereby reducing the pressure differential fluctuations to which the explosion-proof membrane 42 is subjected due to temperature changes, thereby further improving the reliability of the pressure relief device 38. Furthermore, in some examples, by combining the first portion 64 and the second portion 66, the amount of the first portion 64 used is reduced, thereby reducing the cost of the pressure relief device 38.

[0095] It should be understood that the protective film 62 is not limited to including both the first portion 64 and the second portion 66. For example, in other examples, the protective film 62 may be entirely the first portion 64 or entirely the second portion 66.

[0096] Reference Figures 4 to 7 The pressure relief device 38 further includes a flow deflector 68, which is provided with a flow guide channel 70. The flow guide channel 70 is configured to receive the insulating gas discharged from the pressure relief hole 50 when the explosion-proof membrane 42 ruptures, change the flow direction of the insulating gas, and discharge the insulating gas to the outside of the flow deflector 68. The flow deflector 68 is connected to the cover plate 40 and clamps the protective membrane 62 together with the cover plate 40. As an example, the flow deflector 68 is configured to make the insulating gas turn 90 degrees. As an example, when the protective membrane 62 includes a first portion 64 and a second portion 66, the first portion 64 does not contact the flow deflector 68, but is connected to the flow deflector 68 via the second portion 66.

[0097] In the present disclosure, the air guide cover 68 and the cover plate 40 jointly clamp the protective film 62 , so that the air guide cover 68 can prevent the protective film 62 from leaving the pressure relief hole 50 , so that the protective film 62 can stably cover the pressure relief hole 50 .

[0098] It should be understood that the air guide 68 is not necessary. For example, when the axial direction of the pressure relief hole 50 is positioned parallel to the vertical direction, the air guide 68 can be omitted.

[0099] Reference Figures 4 to 8 , the surface 72 of the air guide 68 facing the protective film 62 (see Figure 8 ,Right now Figure 4 A plurality of drainage grooves 74 are provided on the lower surface of the guide channel 70. The drainage grooves 74 are configured to connect the flow guide channel 70 with the exterior of the deflector 68. For example, the drainage grooves 74 may extend radially in the pressure relief hole 50, and the plurality of drainage grooves 74 may be evenly spaced around the circumference of the pressure relief hole 50. For example, the sum of the circumferential widths of the input ports (ports closer to the side of the guide channel 70) of the plurality of drainage grooves 74 may be greater than or equal to one-sixth of the entire circumferential extent of the pressure relief hole 50.

[0100] In the present disclosure, by providing the drainage groove 74, the accumulated water in the diversion channel 70 can be promptly drained from the diversion channel 70 through the drainage groove 74, thereby preventing the protective film 62 from being corroded. In addition, in low temperature conditions such as winter, the drainage groove 74 can prevent the accumulated water from freezing in the diversion channel 70, thereby preventing the diversion channel 70 from being blocked.

[0101] Reference Figures 4 to 7The pressure relief device 38 further includes a protective cover 76 for accommodating the air deflector 68. The protective cover 76 is connected to the air deflector 68 and is spaced outward from the cover plate 40. As an example, the inner circumference of the protective cover 76 can abut against the outer circumference of the air deflector 68. As an example, the protective cover 76 can be fixed to the air deflector 68 by fasteners, such as screws extending through the wall of the protective cover 76.

[0102] In the present disclosure, by providing a protective cover 76, the protective cover 76 can prevent the diversion channel 70 from being blocked by foreign objects, such as preventing animals from building nests in the diversion channel 70, thereby further improving the reliability of the pressure relief device 38. In addition, by connecting the protective cover 76 to the cover plate 40 via the diversion cover 68, the pressure relief device 38 can omit the connecting plate 34 in the prior art (see Figure 2 ), thereby reducing the number of parts of the pressure relief device 38 and further reducing the weight of the pressure relief device 38.

[0103] It should be understood that the protective cover 76 is not necessary. For example, when the pressure relief device 38 is set indoors, the protective cover 76 can be omitted.

[0104] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A pressure relief device (38) for a gas-insulated enclosed switchgear, characterized in that: include: A cover plate (40) is provided with a pressure relief hole (50) for discharging insulating gas existing inside the gas-insulated closed switchgear; an explosion-proof membrane (42), the explosion-proof membrane (42) sealing the pressure relief hole (50); a containing cover (44), the containing cover (44) being annular and being coaxially arranged with the pressure relief hole (50), the containing cover (44) being provided with a containing groove (52) for containing an adsorbent on a side facing the cover plate (40) and having an outer peripheral edge portion (54) and an inner peripheral edge portion (60), the containing cover (44) including an annular flange (55) extending radially outward from the outer peripheral edge portion (54); a plurality of bases (46) removably connected to the cover plate (40); as well as a plurality of press caps (48) which are detachably connected to the plurality of bases (46) and which, together with the plurality of bases (46), clamp the annular flange (55) of the housing cover (44) to connect the housing cover (44) to the cover plate (40), wherein The plurality of bases (46) separate the cover plate (40) from the outer peripheral edge portion (54) of the accommodating cover (44) to form a flow gap (56) between the cover plate (40) and the outer peripheral edge portion (54) of the accommodating cover (44), thereby allowing insulating gas to enter and leave the accommodating tank (52) through the flow gap (56).

2. The pressure relief device (38) according to claim 1, characterized in that The plurality of bases (46) are screwed to the cover plate (40), and / or The plurality of press caps (48) are screwed to the plurality of bases (46).

3. The pressure relief device (38) according to claim 1, characterized in that The axial direction of the pressure relief hole (50) is perpendicular to the annular flange (55) of the accommodating cover (44), and the multiple bases (46) and the multiple pressure caps (48) clamp the annular flange (55) of the accommodating cover (44) in the axial direction of the pressure relief hole (50).

4. The pressure relief device (38) according to claim 1, characterized in that The pressure relief device (38) further includes a pressing plate (58), the pressing plate (58) having an outer side surface and an inner side surface opposite to each other, the outer side surface being located outside the inner side surface in an outward direction away from the interior of the gas-insulated closed switchgear, the pressing plate (58) and the outer side surface of the cover plate (40) jointly clamping the explosion-proof membrane (42); The inner peripheral edge portion (60) of the accommodating cover (44) abuts against the inner side surface of the pressure plate (58) to separate the explosion-proof membrane (42) from the inner peripheral edge portion (60) of the accommodating cover (44).

5. The pressure relief device (38) according to claim 1, characterized in that The cover plate (40) is made of aluminum or aluminum alloy.

6. The pressure relief device (38) according to any one of claims 1 to 5, characterized in that: The explosion-proof membrane (42) is a reverse-arch explosion-proof membrane (42).

7. The pressure relief device (38) according to any one of claims 1 to 5, characterized in that: The pressure relief device (38) further includes a protective film (62), the protective film (62) covering the pressure relief hole (50) from the outer side of the explosion-proof membrane (42) in an outward direction away from the interior of the gas-insulated enclosed switchgear; The protective film (62) includes a first portion (64) and a second portion (66), The protective film (62) is configured to allow gas to pass through the first portion (64) in both directions, allow liquid to pass through the first portion (64) from the inside to the outside, and prevent liquid from passing through the first portion (64) from the outside to the inside. The protective membrane (62) is also configured to block the passage of gas and liquid through the second portion (66).

8. The pressure relief device (38) according to claim 7, characterized in that The first portion (64) is a Gore film, and / or The second portion (66) is a metal foil.

9. The pressure relief device (38) according to claim 7, characterized in that The pressure relief device (38) further includes a flow guide cover (68), wherein the flow guide cover (68) is provided with a flow guide channel (70), and the flow guide channel (70) is configured to receive the insulating gas discharged from the pressure relief hole (50) when the explosion-proof membrane (42) is ruptured, change the flow direction of the insulating gas, and discharge the insulating gas to the outside of the flow guide cover (68); The air guide cover (68) is connected to the cover plate (40) and sandwiches the protective film (62) together with the cover plate (40).

10. The pressure relief device (38) according to claim 9, characterized in that A surface (72) of the air guide cover (68) facing the protective film (62) is provided with a plurality of drainage grooves (74), and the drainage grooves (74) are configured to connect the air guide channel (70) with the outside of the air guide cover (68).

11. The pressure relief device (38) according to claim 10, characterized in that The pressure relief device (38) further includes a protective cover (76) for accommodating the deflector cover (68), and the protective cover (76) is connected to the deflector cover (68) and is spaced apart from the cover plate (40) in the outward direction.

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