Ring main unit

Abstract

The utility model belongs to the technical field of power switch equipment, and discloses a ring main unit. The ring main unit comprises a cabinet body, a hook, a first protective plate and an access door, the cabinet body comprises two oppositely arranged side plates, the side plates are provided with the hook and the first protective plate, the hook at least partially penetrates through the first protective plate, and the hook, the first protective plate and the side plates form a side labyrinth structure; and the access door is hung on the side plate through the hook. The hooks are arranged on the side plates of the cabinet body, and the access door is hung on the side plates of the cabinet body through the hooks, so that a traditional bolt connection and fixation mode is replaced, disassembly and assembly are convenient, and disassembly, assembly and maintenance efficiency is effectively improved; the hook penetrates through the first protective plate, installation is more stable, the side labyrinth structure is formed by the hook, the first protective plate and the side plate, even if electric arc energy rushes out from a gap between the access door and the side plate of the cabinet body, the side labyrinth structure can weaken the electric arc energy, and then the arcing resistance of the ring main unit is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to power switch equipment technical field especially relates to a ring main unit. BACKGROUND

[0002] Ring main unit is a kind of power transmission and distribution electrical equipment, can control and protect power line, by its unique design and material selection, provide excellent anti-arc performance, suitable for various need high safety power distribution system.When internal arc occurs in ring main unit, ring main unit will withstand huge mechanical impact and thermal effect, to reduce the harm caused by arc fault, commonly used means has two kinds: one is to improve the anti-arc ability of switch cabinet itself;Two is to limit arc time, remove fault arc as soon as possible.

[0003] The traditional ring main unit structure, maintenance door and cable chamber cabinet are generally connected and fixed by bolt simply, increase the number of bolt or adopt higher specification diameter high-strength bolt, generally can make the anti-arc performance of ring main unit reach the use requirement, but the structure of this kind of dismounting step is complicated, and maintenance is inconvenient.

[0004] Therefore, it is urgent to provide a ring main unit, to ensure the anti-arc performance of ring main unit, change the connection and fixing mode of traditional bolt, reduce dismounting and maintenance difficulty, improve dismounting and maintenance efficiency. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of ring main unit, to ensure the anti-arc performance of ring main unit, change the connection and fixing mode of traditional bolt, reduce dismounting and maintenance difficulty, improve dismounting and maintenance efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of ring main unit, the ring main unit includes:

[0008] Cabinet, including two oppositely arranged side plates;

[0009] Hook and first guard plate, the side plate is equipped with the hook and the first guard plate, the hook is at least partially threaded in the first guard plate, the hook, the first guard plate and the side plate constitute side labyrinth structure;

[0010] Maintenance door, the maintenance door is hung on the side plate by the hook.

[0011] As an optional technical scheme of a kind of ring main unit, the side plate is equipped with inner bending part, the two sides of the maintenance door are respectively equipped with side bending part, the inner bending part and the side bending part are connected by the hook.

[0012] As an optional technical scheme of the ring net cabinet, the hook is in a U shape, the hook has a first mounting section and a second mounting section which are parallel to each other, the first mounting section is fixed on the inner bending part, and the second mounting section partially penetrates out of the inner bending part and is connected with the side bending part.

[0013] As an optional technical scheme of the ring net cabinet, the first guard plate comprises:

[0014] A first bending section is arranged on the side of the side plate;

[0015] A third bending section is parallel to the first bending section, the third bending section is fixed on the inner bending part and at least partially protrudes out of the inner bending part;

[0016] A second bending section connects the first bending section and the third bending section.

[0017] As an optional technical scheme of the ring net cabinet, the second mounting section is located on one side of the third bending section which faces the side plate, a through hole is arranged on the third bending section, and the first mounting section is fixed in the through hole of the third bending section.

[0018] As an optional technical scheme of the ring net cabinet, the top end of the cabinet body has a first cross beam and a bending plate, the bending plate is arranged on the first cross beam, the top end of the maintenance door is overlapped on the bending plate, and the first cross beam, the bending plate and the maintenance door form a top end labyrinth structure.

[0019] As an optional technical scheme of the ring net cabinet, the bending plate is arranged on one side of the first cross beam which faces the maintenance door, and the first cross beam partially extends to the overlapping position of the bending plate and the maintenance door for shielding the overlapping position from the inside of the cabinet body.

[0020] As an optional technical scheme of the ring net cabinet, the bottom end of the cabinet body has a second cross beam, the bottom end of the maintenance door is overlapped on the second cross beam, a second guard plate is arranged on the second cross beam, and the second guard plate, the second cross beam and the maintenance door form a bottom end labyrinth structure.

[0021] As an optional technical scheme of the ring net cabinet, the second guard plate partially extends to the overlapping position of the maintenance door and the second cross beam for shielding the overlapping position from the inside of the cabinet body.

[0022] As an optional technical scheme of the ring net cabinet, the bottom end of the maintenance door is provided with a bottom hook, and the bottom hook is used for being inserted on the cabinet body.

[0023] And / or, the top end of the maintenance door is provided with a hook structure, and the hook structure is used for being hung on the cabinet body.

[0024] Advantages:

[0025] The utility model provides a ring main unit, the ring main unit includes the cabinet body, the hook, the first baffle and the access door, the cabinet body includes two opposite side plates, the hook is at least partially worn in the first baffle, the side plate is equipped with the hook and the first baffle, the hook, the first baffle and the side plate constitute the side labyrinth structure, is used for weakening the electric arc energy that dashes out the cabinet body, the access door is hung on the side plate through the hook. Through setting up the hook on the cabinet body side plate, the access door is hung on the cabinet body side plate through the hook, to replace the connection fixed mode of traditional bolt, convenient to dismount, effectively improves the dismounting and maintenance efficiency, the hook is worn in the first baffle, and installation is more stable, and through setting up the hook, the first baffle and the side plate constitute the side labyrinth structure, even if the electric arc energy dashes out from the gap of access door and cabinet body side plate, the side labyrinth structure can weaken the electric arc energy, and then guarantee the anti -arcing performance of ring main unit. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is part structure schematic diagram of the ring main unit provided by the utility model embodiment;

[0027] Figure 2 It is part structure schematic diagram of the access door and the cabinet body side plate provided by the utility model embodiment;

[0028] Figure 3 It is Figure 1 The local enlarged view of A in Fig. 1 (access door and cabinet top end);

[0029] Figure 4 It is Figure 1 The local enlarged view of B in Fig. 1 (access door and cabinet bottom end);

[0030] Figure 5 It is structure schematic diagram of the access door provided by the utility model embodiment;

[0031] Figure 6 It is structure schematic diagram of the hook provided by the utility model embodiment;

[0032] Figure 7 It is part sectional view of the ring main unit provided by the utility model embodiment.

[0033] In the figure:

[0034] 1, mechanism chamber;2, inflatable box body;3, pressure relief channel;4, cable chamber;

[0035] 11, side plate;111, inner bending part;12, first cross beam;13, bent plate;14, second cross beam;

[0036] 20, access door; 21, door body; 211, top hook; 212, bottom hook; 213, side bent part; 2131, insertion hole; 22, door handle; 23, protection plate; 24, connecting piece;

[0037] 31, hook; 311, first mounting section; 312, second mounting section; 32, first protection plate; 321, first bent section; 322, second bent section; 323, third bent section; 324, fourth bent section; 33, second protection plate. DETAILED DESCRIPTION

[0038] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0039] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] In the description of the embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.

[0042] As Figures 1 to 7As shown, the embodiment provides a ring main unit, which comprises a cabinet body, a hook 31, a first guard plate 32 and an access door 20. The cabinet body comprises two oppositely arranged side plates 11, the side plates 11 are provided with the hook 31 and the first guard plate 32, the hook 31 is at least partially arranged in the first guard plate 32, and the hook 31, the first guard plate 32 and the side plate 11 form a side labyrinth structure; the access door 20 is hung on the side plate 11 through the hook 31.

[0043] By arranging the hook 31 on the side plate 11 of the cabinet body, the access door 20 is hung on the side plate 11 of the cabinet body through the hook 31, instead of the traditional bolt connection and fixing mode, which is convenient to disassemble and assemble, and effectively improves the disassembly and maintenance efficiency; the hook 31 is arranged in the first guard plate 32, which is more stable in installation, and the side labyrinth structure is formed by arranging the hook 31, the first guard plate 32 and the side plate 11, even if the electric arc energy is discharged from the gap between the access door 20 and the side plate 11 of the cabinet body, the side labyrinth structure can weaken the electric arc energy, thereby ensuring the anti-arc performance of the ring main unit.

[0044] In the embodiment, the labyrinth structure refers to a tortuous narrow path surrounded by a plate, and an object moving in the labyrinth structure needs to change direction multiple times to pass through. In the embodiment, the labyrinth structure refers to that when an electric arc is generated in the cabinet body, the electric arc is not easy to be sprayed out of the labyrinth structure, so as to weaken the electric arc energy; the labyrinth structure has protection capability, which can effectively prevent solid impurities and liquid from invading the cabinet body, and can achieve IP4X protection level.

[0045] Referring to Figure 1 , specifically, the ring main unit comprises a mechanism chamber 1, an inflation tank 2, a pressure relief channel 3 and a cable chamber 4. The mechanism chamber 1 is the operating mechanism part in the ring main unit, which is responsible for controlling the switching operation of the ring main unit. The inflation tank 2 is the insulation part in the ring main unit, which usually uses SF6 gas for insulation. The main function of the inflation tank 2 is to provide the connection of high-voltage cables and power systems, and to play a protective role in the event of a fault. The pressure relief channel 3 is designed inside the ring main unit, which is used to release the internal pressure when abnormal conditions occur, preventing the equipment from being damaged due to excessive pressure, and ensuring safety in extreme cases. The cable chamber 4 is used to store and manage cables entering and exiting the ring main unit.

[0046] In the embodiment, the mechanism chamber 1 is located above the cable chamber 4, and the inflation tank 2 is located above the pressure relief channel 3. The cabinet body of the cable chamber 4 is provided with an access door 20.

[0047] Optionally, the top end of the access door 20 is provided with a hook structure, which is used to be hung on the cabinet body. The access door 20 is hung on the cabinet body, which is not only hung through the hook 31 on the side plate 11, but also can be connected with the cabinet body at the top or bottom of the access door 20, so as to enhance the connection and fixing strength.

[0048] Further, the access door 20 comprises a door body 21 and a door handle 22, the door handle 22 is fixedly connected with the door body 21 through a connecting piece 24, one end of the connecting piece 24 is abutted against the door handle 22, and the other end of the connecting piece 24 penetrates through the door body 21 and extends to the outside of the door body 21 for being hung on the cabinet. In the embodiment, the connecting piece 24 is taken as a hook structure, and the access door 20 is hung on the cabinet by the connecting piece 24. In other embodiments, other hook-like structures can be arranged at the top end of the door body 21 for hanging.

[0049] Referring to Figure 2 , Figure 3 and Figure 5 , the access door 20 further comprises a protective plate 23, the door handle 22 is arranged at the top end of the door body 21, and the protective plate 23 is arranged on the inner side of the door body 21. The protective plate 23 mainly plays a role of preventing personnel from being mistakenly touched to reduce the risk of electric shock and reducing electromagnetic radiation, and the protective plate 23 can be made of a steel plate, an alloy plate or an insulating plate.

[0050] Optionally, the top end of the door body 21 is provided with a top hook 211, the cross section of the door handle 22 is in a U shape, the door handle 22 and the top hook 211 are matched to hide the connecting piece 24, the connecting piece 24 is a welded bolt, the connecting piece 24 is firmly welded with the door handle 22, the connecting piece 24 is located between the top hook 211 and the door handle 22, and the connecting piece 24 extends in the vertical direction and penetrates through the top hook 211 to be hung on the cabinet. By hiding the connecting piece 24 in the door handle 22, the connecting piece 24 cannot be seen from the outside of the access door 20, so as to ensure the overall appearance. In the embodiment, two connecting pieces 24 are arranged side by side in the horizontal direction.

[0051] Referring to Figure 2 , the side plate 11 of the cabinet is provided with an inner folding portion 111, and the access door 20 is provided with a side folding portion 213 on each side, and the inner folding portion 111 and the side folding portion 213 are connected through a hook 31. By arranging the folding edges on the cabinet side plate 11 and the two sides of the access door 20, that is, the inner folding portion 111 is arranged on the side plate 11, and the side folding portion 213 is arranged on the access door 20, the access door 20 can be conveniently hung on the cabinet, and the stability of the installation of the access door 20 can be ensured.

[0052] In the embodiment, the inner folding portion 111 is formed by bending the side edge of the flat plate-shaped side plate 11 inwardly to the cabinet, and the cross section of the inner folding portion 111 is in an L shape; the side folding portion 213 is formed by bending the side edge of the flat plate-shaped door body 21 inwardly, and the cross section of the side folding portion 213 is also in an L shape; when the access door 20 is hung on the cabinet, the side folding portion 213 can be attached to the inner folding portion 111.

[0053] Referring to Figure 6Further, the hook 31 is in a U shape, and the hook 31 has a first mounting section 311 and a second mounting section 312 which are parallel to each other, the first mounting section 311 is fixed on the inner bending part 111, and the second mounting section 312 is connected with the side bending part 213 from the inner bending part 111. By setting the hook 31 in a U shape, by fixing the first mounting section 311 of the hook 31 on the inner bending part 111, and by connecting the second mounting section 312 with the side bending part 213 from the inner bending part 111, the hook 31 is mostly located inside the inner bending part 111, and only the second mounting section 312 partially extends from the inner bending part 111, which can ensure the stability of the installation of the hook 31, and also avoids the interference of the installation of the hook 31 on the outside of the inner bending part 111 with the hanging of the maintenance door 20. In the embodiment, the top end of the second mounting section 312 of the hook 31 is provided with a clamping groove, and the side bending part 213 of the maintenance door 20 is clamped in the clamping groove, so as to hang the maintenance door 20 on the cabinet body.

[0054] Referring to Figure 5 In the embodiment, the door body 21 is provided with a side bending part 213 on each side, and the side bending part 213 is provided with a plurality of insertion holes 2131 which are arranged in a vertical direction; correspondingly, the hook 31 is arranged in one-to-one correspondence with the insertion holes 2131; and the hook 31 can be partially inserted into the insertion hole 2131 and clamped with the side bending part 213. By setting a plurality of insertion holes 2131 on both sides and cooperating with the hook 31, the left and right sides can jointly bear the stress, and the connection and fixing strength is improved.

[0055] Further, the first guard plate 32 includes a first bending section 321, a second bending section 322 and a third bending section 323, the first bending section 321 is arranged on the side surface of the side plate 11, the second bending section 322 connects the first bending section 321 and the third bending section 323, the third bending section 323 is parallel to the first bending section 321, and the third bending section 323 is fixed on the inner bending part 111 and at least partially protrudes from the inner bending part 111; the second mounting section 312 is located on the side of the third bending section 323 which faces the side plate 11, the third bending section 323 is provided with a through hole, and the first mounting section 311 is fixed in the through hole of the third bending section 323.

[0056] When an arc fault occurs, the maintenance door 20 is subjected to an outward force, so that the hook 31 and the inner bending part 111 of the side plate 11 are also subjected to an outward force. Since the first guard plate 32 is fixed on the side surface of the side plate 11 and the inner bending part 111 respectively, the side surface of the side plate 11 can share the stress at the inner bending part 111 and the hook 31, the connection and fixing strength is improved, the deformation is reduced, and a large amount of arc energy is prevented from being discharged from the deformed gap.

[0057] In the embodiment, the hook 31 and the first guard plate 32 are detachably fixed to the inner bending part 111 of the side plate 11; the hook 31 and the first guard plate 32 can be connected to the inner bending part 111 by bolts respectively; the first guard plate 32 is in Z shape, and the second bending section 322 is perpendicular to the first bending section 321 and the third bending section 323.

[0058] By setting the first bending section 321 of the first guard plate 32 to be attached to the side plate 11 and the third bending section 323 to be located on the side away from the side plate 11 of the second mounting section 312, the first guard plate 32 can shield the second mounting section 312 of the hook 31 from the inside of the cabinet; by setting a through hole on the third bending section 323 and fixing the first mounting section 311 of the hook 31 in the through hole of the third bending section 323, the relative mounting positions of the hook 31 and the first guard plate 32 are limited by the through hole, and the mounting of the hook 31 can be more stable; the third bending section 323 partially protrudes outward from the inner bending part 111, so that the third bending section 323 and the inner side of the protective plate 23 of the access door 20 form a narrow gap to weaken the electric arc.

[0059] In the embodiment, the first guard plate 32 further includes a fourth bending section 324, which is attached to the third bending section 323 and located on the side away from the side plate 11 of the third bending section 323. By setting the fourth bending section 324, the resistance of airflow can be increased, and the arc fault pressure relief effect can be improved.

[0060] Referring to Figure 2 and Figure 6 When the side bending part 213 of the access door 20 is hung on the side plate 11 of the cabinet by the U-shaped hook 31, the first mounting section 311 of the hook 31 is fixed on the inner bending part 111 of the side plate 11, and the second mounting section 312 of the hook 31 is inserted into the opening of the inner bending part 111 and passes out of the opening to hang the access door 20; the first guard plate 32 in Z shape, the first bending section 321 is attached and fixed to the side of the side plate 11, and the third bending section 323 protrudes from the inner bending part 111 of the side plate 11, which can protect the connection position of the second mounting section 312 of the hook 31 and the access door 20, and avoid the direct impact of the electric arc on the connection position of the hook 31 and the access door 20; the first guard plate 32, the side bending part 213 of the access door 20 and the inner bending part 111 of the side plate 11 form a side labyrinth structure, even if the electric arc energy can be discharged from the gap between the first guard plate 32 and the protective plate 23 of the access door 20, the side labyrinth structure can weaken it, and prevent a large amount of electric arc energy from being discharged from the cabinet.

[0061] It can be understood that on one side of the access door 20, the side bending part 213 extends in the vertical direction, a plurality of hooks 31 are arranged in the vertical direction, and the first guard plate 32 extends in the vertical direction and can protect the connection positions of the plurality of hooks 31 and the access door 20.

[0062] In order to improve the anti-arc performance, the top end of the cabinet body has a first cross beam 12 and a bent plate 13, the bent plate 13 is arranged on the first cross beam 12, and the top end of the access door 20 is overlapped on the bent plate 13. The first cross beam 12, the bent plate 13 and the access door 20 form a top end labyrinth structure. By arranging the first cross beam 12, the bent plate 13 and the access door 20 to form the top end labyrinth structure, even if the arc energy is discharged from the gap between the top end of the cabinet body and the access door 20, the top end labyrinth structure can weaken it, so as to avoid a large amount of arc energy from being discharged from the cabinet body.

[0063] Optionally, the bent plate 13 is arranged on one side of the first cross beam 12 facing the access door 20, and the first cross beam 12 extends to the overlapping part of the bent plate 13 and the access door 20 from the inside of the cabinet body to shield the overlapping part of the bent plate 13 and the access door 20. By shielding the overlapping part of the bent plate 13 and the access door 20 by the first cross beam 12, a protection effect is achieved, so as to avoid the arc energy from directly impacting the connection part of the bent plate 13 and the access door 20.

[0064] In the embodiment, the first cross beam 12 is in a U shape, and the bent plate 13 is in an S shape. The bent plate 13 is detachably fixed on the first cross beam 12 by bolts. The connecting piece 24 connects the door body 21 and the door handle 22, and the end of the connecting piece 24 can be inserted into the opening of the bent plate 13, so that the access door 20 is hung on the cabinet body.

[0065] Specifically, the first cross beam 12 extends in the horizontal direction, the access door 20 extends in the vertical direction, the first cross beam 12 is close to the access door 20 in the horizontal direction, and a narrow gap is formed between the first cross beam 12 and the access door 20, so as to shield the overlapping part of the bent plate 13 and the access door 20. In other embodiments, the first cross beam 12 can also be arranged to extend obliquely, and the size and shape of the first cross beam 12 can be adaptively adjusted according to actual conditions, as long as the overlapping part of the bent plate 13 and the access door 20 can be shielded from the inside of the cabinet body.

[0066] Referring to Figure 3 When the top end of the access door 20 is hung on the cabinet body, the connecting piece 24 is inserted into the opening of the bent plate 13, the first cross beam 12 extends below the connecting piece 24, a narrow gap is formed between the first cross beam 12 and the protective plate 23, and the first cross beam 12 can shield the position near the connecting piece 24 to form a protection, so that the connecting piece 24 is prevented from being directly impacted by the arc energy. The first cross beam 12, the bent plate 13 and the access door 20 form a top end labyrinth structure, so that even if the arc energy is discharged from the gap between the first cross beam 12 and the protective plate 23 of the access door 20, the top end labyrinth structure can weaken it, so as to prevent a large amount of arc energy from being discharged from the cabinet body. In the embodiment, the first cross beam 12 extends in the horizontal direction, so as to shield and protect the two spaced connecting pieces 24 at the same time, so that the connecting pieces 24 are prevented from being directly impacted by the arc energy.

[0067] Referring to Figure 4 Further, the bottom end of the cabinet body has a second cross beam 14, the bottom end of the access door 20 is overlapped on the second cross beam 14, and the second cross beam 14 is provided with a second guard plate 33, and the second guard plate 33, the second cross beam 14 and the access door 20 form a bottom end labyrinth structure. By setting the second guard plate 33, the second cross beam 14 and the access door 20 to form the bottom end labyrinth structure, even if the arc energy is discharged from the gap between the bottom end of the cabinet body and the access door 20, the bottom end labyrinth structure can be used to weaken it, avoiding a large amount of arc energy from being discharged from the cabinet body.

[0068] Optionally, the second guard plate 33 partially extends to the overlapping position of the access door 20 and the second cross beam 14 for shielding the overlapping position from the inside of the cabinet body. By shielding the overlapping position of the second cross beam 14 and the access door 20 with the second guard plate 33, a protection effect is achieved, avoiding the arc energy from directly impacting the overlapping position of the second cross beam 14 and the access door 20.

[0069] Referring to Figure 4 and Figure 5 Optionally, the bottom end of the access door 20 is provided with a bottom hook 212 for being inserted on the cabinet body. By setting the bottom hook 212 on the access door 20, the bottom hook 212 is inserted on the cabinet body, which can improve the stability of the connection.

[0070] In this embodiment, the bottom hook 212 is inserted on the second cross beam 14; two bottom hooks 212 are arranged side by side and spaced apart; the second guard plate 33 is in a Z shape, a narrow gap is formed between the second guard plate 33 and the protective plate 23, and the second guard plate 33 can protect the bottom hook 212.

[0071] Specifically, the second guard plate 33 partially extends in the horizontal direction, and the second guard plate 33 is close to the access door 20 in the horizontal direction and forms a narrow gap with the access door 20, thereby being able to shield the overlapping position of the access door 20 and the second cross beam 14. In other embodiments, the second guard plate 33 can also be partially inclined to extend, and the size and shape of the second guard plate 33 can also be adaptively adjusted according to actual conditions, as long as the overlapping position of the access door 20 and the second cross beam 14 can be shielded from the inside of the cabinet body.

[0072] When the bottom hook 212 of the access door 20 is inserted on the second cross beam 14, the Z-shaped second guard plate 33 is fixed on the second cross beam 14, the upper bending of the second guard plate 33 is bent outwards the cabinet, the bending of the upper part of the second guard plate 33, the middle part of the second guard plate 33 and the bottom bending of the second guard plate 33 all form protection at the position of the bottom hook 212, so that the bottom hook 212 is prevented from being directly impacted by the electric arc energy; the second guard plate 33, the second cross beam 14 and the access door 20 form a bottom end labyrinth structure, even if the electric arc energy is discharged from the gap between the second guard plate 33 and the protection plate 23 of the access door 20, the bottom end labyrinth structure can weaken the electric arc energy, so as to prevent a large amount of electric arc energy from being discharged from the cabinet. In the embodiment, the second guard plate 33 is partially extended in the horizontal direction, so that the two spaced bottom hooks 212 can be simultaneously shielded and protected from being directly impacted by the electric arc energy.

[0073] Referring to Figure 7 The insertion depth of the connecting piece 24 is C, the insertion depth of the bottom hook 212 is D, the upper bending of the second guard plate 33 has a spacing distance E from the bottom hook 212, and the spacing distance E>D≥C. When the access door 20 is pulled upwards, the connecting piece 24 is separated from the bent plate 13, the bottom hook 212 can be pulled upwards until it is separated from the second cross beam 14, and the side bending part 213 of the access door 20 can be separated from the hook 31, so as to open the access door 20. Similarly, when the access door 20 is installed, the bottom hook 212 needs to be inserted into the second cross beam 14, and the side bending part 213 needs to be hung on the hook 31, and the connecting piece 24 at the top of the access door 20 needs to be inserted into the bent plate 13, so as to hang the access door 20 on the cabinet.

[0074] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Ring main unit, characterized in that The utility model relates to a cabinet, including: Cabinet body, including two opposite side plates (11); Hook (31) and first baffle (32), the side plate (11) is equipped with hook (31) and first baffle (32), hook (31) is at least partially worn in first baffle (32), hook (31), first baffle (32) and side plate (11) constitute side labyrinth structure; Access door (20), the access door (20) is hung on the side plate (11) through the hook (31).

2. The ring main unit according to claim 1, characterized in that The side plate (11) is provided with an inner bending part (111), and the two sides of the access door (20) are respectively provided with a side bending part (213), and the inner bending part (111) and the side bending part (213) are connected through the hook (31).

3. The ring main unit according to claim 2, characterized in that The hook (31) is U-shaped, and the hook (31) has a first mounting section (311) and a second mounting section (312) parallel to each other, the first mounting section (311) is fixed on the inner bending part (111), and the second mounting section (312) partially penetrates out of the inner bending part (111) and is connected with the side bending part (213).

4. The ring main unit according to claim 3, characterized in that The first baffle (32) includes: The first bending section (321) is arranged on the side surface of the side plate (11); The third bending section (323) is parallel to the first bending section (321), and the third bending section (323) is fixed to the inner bending part (111) and at least partially protrudes outward from the inner bending part (111); The second bending section (322) connects the first bending section (321) and the third bending section (323).

5. The ring main unit according to claim 4, characterized in that The second mounting section (312) is located on one side of the third bending section (323) facing the side plate (11), the third bending section (323) is provided with a through hole, and the first mounting section (311) is fixedly arranged in the through hole of the third bending section (323).

6. The ring main unit according to claim 1, characterized in that The top end of the cabinet body has a first cross beam (12) and a bent plate (13), the bent plate (13) is arranged on the first cross beam (12), the top end of the access door (20) is overlapped on the bent plate (13), and the first cross beam (12), the bent plate (13) and the access door (20) constitute a top end labyrinth structure.

7. The ring main unit according to claim 6, characterized in that The bent plate (13) is arranged on one side of the first cross beam (12) facing the access door (20), and the first cross beam (12) partially extends to the overlapping position of the bent plate (13) and the access door (20) for shielding the overlapping position from the inside of the cabinet.

8. The ring main unit according to claim 1, characterized in that, The bottom end of the cabinet body has a second cross beam (14), the bottom end of the access door (20) is overlapped on the second cross beam (14), the second cross beam (14) is provided with a second baffle (33), and the second baffle (33), the second cross beam (14) and the access door (20) constitute a bottom end labyrinth structure.

9. The ring main unit according to claim 8, characterized in that The second baffle (33) partially extends to the overlapping position of the access door (20) and the second cross beam (14) for shielding the overlapping position from the inside of the cabinet.

10. The ring main unit according to claim 1, characterized in that, The bottom end of the access door (20) is provided with a bottom hook (212) for being inserted on the cabinet body. And / or, the top end of the access door (20) is provided with a hook structure for being hung on the cabinet body.

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