Ring main unit
Through the design of detachable cabinet body and control box, precise positioning and temporary support are achieved by using limit protrusions and limit slots, which solves the problems of low installation efficiency and safety hazards of traditional ring network cabinets and realizes modular maintenance and flexible layout.
Patent Information
- Application Number
- CN202511190683.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2025-09-26
AI Technical Summary
Traditional ring network cabinets are bulky, difficult to transport and install, lack precise positioning structures, resulting in low installation efficiency. The cabinet body and control box are difficult to flexibly separate, posing safety hazards during disassembly, and the internal space cannot be flexibly adjusted.
The cabinet body and control box are designed with detachable connections. Precise positioning and temporary support are achieved through the shape adaptability of the limiting protrusions and limiting slots, ensuring accurate assembly and avoiding shaking, and supporting modular maintenance and flexible layout.
It improves installation efficiency, reduces safety risks, supports modular maintenance, facilitates flexible adjustment of space layout and functions according to needs, and improves the overall flexibility of the ring network cabinet.
Smart Images
Figure CN120709841A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of ring main unit (RMU), and in particular to a RMU. Background Art
[0002] Ring main units (RMUs), core equipment in medium-voltage power distribution networks, are widely used in urban power grids, industrial parks, and in new energy access scenarios. With the rapid development of power distribution systems, RMUs with modular design, fast installation, and easy maintenance have become important industry requirements.
[0003] The cabinet body and control box of traditional ring network cabinets mostly adopt an integrated structure or fixed connection method. The integrated structure is bulky and difficult to transport and install. The fixed connection method lacks precise positioning structure during installation, and the position needs to be repeatedly adjusted to ensure accurate connection, resulting in low installation efficiency; the cabinet body and control box are difficult to flexibly disassemble, which is not conducive to modular maintenance and component replacement; when disassembling the control box (especially the control box at high places), due to the lack of pre-support structure, the box body is prone to shaking or even falling off due to loss of positioning support after the bolts are removed, posing a serious safety hazard; the integrated or fixed connection structure limits the flexible adjustment of the internal space and cannot adapt to the layout requirements in different scenarios. Summary of the Invention
[0004] The purpose of this application is to provide a ring network cabinet to solve, to a certain extent, the problems existing in the prior art, such as the bulky integrated structure and the difficulty in transportation and installation; the fixed connection method lacks a precise positioning structure during the installation process, and the position needs to be repeatedly adjusted to ensure accurate connection, resulting in low installation efficiency; the cabinet body and the control box are difficult to flexibly disassemble, which is not conducive to modular maintenance and component replacement; when disassembling the control box (especially the high-rise control box), due to the lack of pre-support structure, the box body is prone to shaking or even falling off due to loss of positioning support after the bolts are removed, posing a serious safety hazard; the integrated or fixed connection structure limits the flexible adjustment of the internal space and cannot adapt to the layout requirements in different scenarios.
[0005] According to the first aspect of the present application, a ring network cabinet is provided, comprising a cabinet body and a control box that are detachably connected to each other, the first of the cabinet body and the control box being provided with a limiting protrusion, the second of the cabinet body and the control box being provided with a limiting card slot that is adapted to the shape of the limiting protrusion, the limiting protrusion and the limiting card slot being respectively provided with corresponding positions on the side walls of the cabinet body and the control box facing each other, so that when the cabinet body and the control box are in an assembled state, the limiting protrusion is clamped in the limiting card slot.
[0006] Preferably, the control box comprises a box body portion and a box door portion hinged to each other; The box body includes a top plate, a back plate, a bottom plate, and two side plates, wherein the top plate, the back plate, and the bottom plate are connected end to end in sequence, wherein the top plate and the bottom plate are arranged opposite to each other along a first direction, the box door portion is arranged between the top plate and the bottom plate, and the box door portion and the back plate are arranged opposite to each other along a second direction, and the first direction is perpendicular to the second direction; The connector of the top plate, the back plate and the bottom plate and the door portion form a cylindrical structure extending along a third direction, and the two side plates are respectively arranged on both sides of the cylindrical structure in the third direction, and the third direction is perpendicular to the plane determined by the first direction and the second direction.
[0007] Preferably, the top plate, the back plate and the bottom plate are an integral bent part.
[0008] Preferably, the control box and the cabinet body are stacked along the first direction, and the limit slot is provided on the bottom plate; The bottom plate is provided with a hollow area penetrating the bottom plate to provide a channel for line connection between the control box and the cabinet body.
[0009] Preferably, a lifting lug is provided on the side of the cabinet body facing the control box; One end of the control box door is aligned with one end of the cabinet body in the second direction; In the second direction, the size of the cabinet body is larger than that of the control box; The lifting lug is provided on a portion of the cabinet body that extends beyond the control box in the second direction.
[0010] Preferably, the back plate further comprises a flat plate and an avoidance inclined plate connected to each other, the flat plate is arranged perpendicular to the second direction, the flat plate is connected to the top plate, and the avoidance inclined plate is connected to the bottom plate; Along the first direction, in a direction from the end of the avoidance inclined plate connected to the flat plate to the other end, the avoidance inclined plate gradually tilts toward a side away from the lifting ear.
[0011] Preferably, the control box further comprises a loading plate, the loading plate is provided with mounting holes for placing components, the loading plate is arranged in the box body, the loading plate is arranged parallel to the back plate, and the loading plate is detachably connected to the back plate.
[0012] Preferably, the inner side of the back plate is provided with supporting ribs, and the supporting ribs are provided along the two side edges of the back plate in the third direction; The two ends of the loading plate in the third direction are respectively mounted on the supporting ribs to form an accommodating gap between the loading plate and the back plate.
[0013] Preferably, the box body further comprises a hinge bar, which extends along the first direction. The hinge bar is provided on a side of one of the two side panels facing the box door portion, and the box door portion is hinged to the box body via the hinge bar.
[0014] Preferably, the limiting protrusion is a columnar structure extending along the first direction, and the size of the columnar structure in the second direction is not equal to its size in the third direction.
[0015] Compared with the prior art, the present invention has the following advantages: The ring network cabinet provided in the present application, through the shape adaptability of the limiting protrusion and the limiting slot, and the position design on the corresponding side wall, on the one hand, can achieve pre-positioning by directly engaging the limiting protrusion and the limiting slot when the cabinet body and the control box are assembled, and the connection position of the two can be ensured to be accurate without repeatedly adjusting the position, reducing the positioning adjustment time during the installation process and significantly improving the installation efficiency; on the other hand, during the installation process, the engagement of the limiting protrusion and the limiting slot can provide temporary support and positioning to prevent the components from hanging and shaking in the air; during the disassembly process, even if the bolts and other fasteners are removed, the limiting protrusion can still be temporarily stuck in the slot to provide support for the box body to prevent it from suddenly shaking or falling off due to loss of positioning, effectively solving the safety hazards in the traditional disassembly method; compared with traditional welding or non-detachable fixing structures, the detachable connection design allows the cabinet body and the control box to be flexibly disassembled. When the control box or the cabinet body fails, the corresponding components can be disassembled separately for repair or replacement without the need for overall processing, meeting the needs of modular maintenance and reducing maintenance costs and difficulty. In addition, the detachable connection method breaks the limitations of traditional integrated or fixed structures, allowing the cabinet body and control box to be flexibly split or combined according to actual needs, making it convenient to adjust the relative position of the two or replace them separately according to the spatial layout and functional requirements of the power distribution scenario, thereby improving the overall flexibility of the ring network cabinet structure.
[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0018] Figure 1A schematic diagram of the axonometric structure of a ring main unit provided in an embodiment of the present application; Figure 2 for Figure 1 Provided is a schematic diagram of the partial structure of the ring main unit; Figure 3 for Figure 2 The enlarged structural diagram of the ring main unit at point A is provided; Figure 4 This is a schematic diagram of the axonometric structure of the connector provided in an embodiment of the present application; Figure 5 Schematic diagram of the exploded structure of the control box provided in an embodiment of the present application.
[0019] Reference numerals: 1 - cabinet body; 11 - lifting ear; 12 - limiting protrusion; 21 - cabinet body; 211 - top plate; 212 - back plate; 2121 - flat plate; 2122 - avoidance inclined plate; 2123 - supporting rib; 213 - bottom plate; 2131 - hollow area; 214 - side plate; 2141 - connecting pin; 22 - cabinet door; 23 - limiting slot; 24 - hinge bar; 25 - docking hole; F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION
[0020] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.
[0021] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.
[0022] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.
[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0024] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0025] Refer to the following Figures 1 to 4 The ring main unit according to some embodiments of the present application is described.
[0026] See also Figures 1 to 3 As shown, an embodiment of the present application provides a ring network cabinet, which includes a cabinet body 1 and a control box that are detachably connected to each other, the first of the cabinet body 1 and the control box are provided with a limiting protrusion 12, and the second of the cabinet body 1 and the control box are provided with a limiting card slot 23 that is adapted to the shape of the limiting protrusion 12, and the limiting protrusion 12 and the limiting card slot 23 are respectively provided with corresponding positions on the side walls of the cabinet body 1 and the control box facing each other, so that when the cabinet body 1 and the control box are in an assembled state, the limiting protrusion 12 is clamped in the limiting card slot 23.
[0027] According to the ring network cabinet provided by the above technical features, through the shape adaptability of the limiting protrusion 12 and the limiting slot 23, and the position design on the corresponding side wall, on the one hand, the cabinet body 1 and the control box can be pre-positioned by directly engaging the limiting protrusion 12 with the limiting slot 23 when assembled, and the connection position of the two can be ensured to be accurate without repeatedly adjusting the position, reducing the positioning adjustment time during the installation process and significantly improving the installation efficiency; on the other hand, during the installation process, the engagement of the limiting protrusion 12 and the limiting slot 23 can provide temporary support and positioning to prevent the components from hanging and shaking in the air; during the disassembly process, even if the bolts and other fixings are removed, the limiting protrusion 12 can still be temporarily stuck in the slot to provide support for the box body to prevent it from suddenly shaking or falling off due to loss of positioning, effectively solving the safety hazards in the traditional disassembly method; compared with the traditional welding or non-detachable fixing structure, the detachable connection design makes the cabinet body 1 and the control box flexibly disassembled. When the control box or the cabinet body 1 fails, the corresponding components can be disassembled separately for repair or replacement without the need for overall processing, meeting the needs of modular maintenance and reducing maintenance costs and difficulty. In addition, the detachable connection method breaks the limitations of the traditional integrated or fixed structure, allowing the cabinet body 1 and the control box to be flexibly split or combined according to actual needs, making it convenient to adjust the relative positions of the two or replace them separately according to the spatial layout and functional requirements of the power distribution scenario, thereby improving the overall flexibility of the ring network cabinet structure.
[0028] Preferably, if Figures 1 to 5 As shown, the control box may include a box body 21 and a box door 22 that are hinged to each other, so that the box door 22 can be flexibly opened and closed, which is convenient for the installation, inspection and maintenance of the components inside the control box. Figure 4 and Figure 5 As shown, the box body 21 may include a top plate 211, a back plate 212, a bottom plate 213 and two side plates 214, and the top plate 211, the back plate 212 and the bottom plate 213 are connected end to end in sequence, wherein the top plate 211 and the bottom plate 213 are arranged opposite to each other along a first direction F1, the box door portion 22 is arranged between the top plate 211 and the bottom plate 213, and the box door portion 22 and the back plate 212 are arranged opposite to each other along a second direction F2, and the first direction F1 is perpendicular to the second direction F2. The connector of the top plate 211, the back plate 212 and the bottom plate 213 and the box door portion 22 are arranged to form a cylindrical structure extending along the third direction F3. The two side panels 214 are respectively arranged on both sides of the cylindrical structure in the third direction F3. The third direction F3 is perpendicular to the plane determined by the first direction F1 and the second direction F2. In this way, the cylindrical structure cooperates with the two side panels 214 to form a closed box frame, which not only enhances the overall structural strength of the control box, but also optimizes the internal layout through clear three-dimensional space division, solving the problems of cluttered internal space and poor structural stability of traditional control boxes.
[0029] It should be noted that if Figures 1 to 5 As shown, F1 shown in the figure may be an example of the first direction F1 mentioned above, F2 shown in the figure may be an example of the second direction F2 mentioned above, and the third direction F3 shown in the figure may be an example of the third direction F3 mentioned above.
[0030] Preferably, if Figures 1 to 3 As shown, the control box and the cabinet body 1 can be stacked along the first direction F1, the limiting slot 23 can be set on the bottom plate 213 of the control box, and the limiting protrusion 12 can be set on the top of the cabinet body 1.
[0031] Preferably, if Figure 2 and Figure 3 As shown, the above-mentioned limiting protrusion 12 can be a columnar structure extending along the first direction F1, and the size of the columnar structure in the second direction F2 is not equal to its size in the third direction F3. In this way, the non-equal-size columnar structure (such as an elliptical column, a waist-shaped column, a rectangular parallelepiped or other irregular columns) can prevent the cabinet body 1 and the control box from rotating relative to each other after assembly through shape restrictions, ensuring the unique matching of the limiting protrusion 12 and the card slot, improving the positioning accuracy, avoiding installation misalignment, and further enhancing the connection stability.
[0032] Preferably, corresponding positions of the above-mentioned base plate 213 and the top of the above-mentioned cabinet body 1 can be provided with docking holes 25, so that fasteners (such as bolts, screws, etc.) can be passed through the above-mentioned base plate 213 and the top docking holes 25 of the above-mentioned cabinet body 1 to achieve a detachable connection between the control cabinet and the cabinet body 1.
[0033] Preferably, if Figure 5 As shown, the box body 21 may include a connecting pin 2141 extending along the third direction F3. The connecting pin 2141 may be fixed to a side of the side panel 214 facing the connector formed by the top panel 211, the back panel 212, and the bottom panel 213. Correspondingly, corresponding positions of the connector formed by the top panel 211, the back panel 212, and the bottom panel 213 are provided with positioning holes for inserting the connecting pin 2141. On the one hand, the positioning holes and the connecting pin 2141 are connected to achieve precise positioning of the side panel 214. On the other hand, the positioning pin 2141 is arranged on the side of the side panel 214 facing the connector, which can effectively ensure the flatness and neatness of the outer side of the side panel 214. However, as an example not shown in the figure, the connecting pin 2141 may also be arranged on the connector, and the positioning hole may be arranged on the side panel 214.
[0034] Optionally, the connecting pin 2141 may be provided with an external thread, and the box body 21 may further include a fixing nut matching the external thread, so as to achieve fixation between the side plate 214 and the connector through the threaded connection between the fixing nut and the connecting pin 2141.
[0035] Optionally, the side panels 214 and the connector may be fixed by welding or bonding.
[0036] Preferably, if Figure 4 and Figure 5 As shown, the top plate 211, back plate 212, and bottom plate 213 can be a single-piece bent member. In conventional structures, the top plate 211, back plate 212, and bottom plate 213 are often spliced together (e.g., bolted or welded), resulting in loose joints and low structural strength. The single-piece bent member is formed through continuous bending, reducing the number of joint gaps and connecting components, significantly improving the structural rigidity and sealing of the box body 21. It also simplifies the production process, reduces assembly errors, and improves production efficiency.
[0037] Preferably, if Figures 1 to 5 As shown, the above-mentioned base plate 213 can be provided with a hollow area 2131 passing through the base plate 213 to provide a channel for the line connection between the control box and the cabinet body 1. The hollow area 2131 is specially reserved for the line, so that the line can be hidden inside, reducing external interference and wear risks, and facilitating line sorting and subsequent maintenance.
[0038] In an embodiment, Figure 1 As shown, a lifting lug 11 is provided on the side of the cabinet body 1 facing the control box. In this way, the lifting lug 11 provides a force point for the lifting of the cabinet body 1, which is convenient for lifting and unloading during transportation, and solves the difficulty of transporting the traditional integrated chassis.
[0039] Preferably, if Figure 1 As shown, one end of the door portion 22 of the control box is aligned with one end of the cabinet body 1 in the second direction F2. In this way, the alignment ensures the structural compactness of the control box and the cabinet body 1 in the front-to-back direction, avoids space waste or external interference due to misalignment, and improves the rationality of the overall layout.
[0040] Preferably, if Figure 1 As shown, in the second direction F2, the cabinet body 1 is larger than the control box. The lifting lug 11 is located on the portion of the cabinet body 1 that extends beyond the control box in the second direction F2. This location prevents the lifting lug 11 from being blocked by the control box, ensuring that the lifting device can smoothly connect to the lifting lug 11 during lifting. This improves the convenience and safety of the lifting operation and solves the problem of traditional lifting points being blocked by components.
[0041] Preferably, if Figures 1 to 5 As shown, the back panel 212 may further include a flat plate 2121 and an avoidance inclined plate 2122 connected to each other. The flat plate 2121 is arranged perpendicular to the second direction F2, the flat plate 2121 is connected to the top plate 211, and the avoidance inclined plate 2122 is connected to the bottom plate 213. Along the first direction F1, in a direction from the end of the avoidance inclined plate 2122 connected to the flat plate 2121 to the other end, the avoidance inclined plate 2122 gradually tilts toward the side away from the lifting lug 11. In this way, the avoidance inclined plate 2122 actively avoids the position of the lifting lug 11 through its tilted design, increasing the installation gap between the control box and the cabinet body 1, avoiding structural interference, and providing more space for maintenance operations, thereby improving the convenience of installation and maintenance.
[0042] Preferably, if Figure 5As shown, the above-mentioned control box may further include a loading plate, which is provided with mounting holes for placing components, and the loading plate is arranged in the box body 21, and the loading plate is arranged parallel to the back plate 212, and the loading plate and the back plate 212 are detachably connected. In this way, on the one hand, the loading plate can flexibly fix different components through the mounting holes; on the other hand, the detachable connection between the loading plate and the box body 21 not only allows the loading plate to be replaced or its position to be adjusted as needed, thereby realizing the modularity and flexibility of the component layout, solving the problem of poor flexibility of the traditional internal space layout, and facilitating the replacement and upgrading of components in the later stage; and when installing components on the loading plate, the loading plate can be assembled by removing it from the box body 21, so that the installation of the components is not limited by the space of the box body 21, thereby facilitating the assembly operation of the components.
[0043] Optionally, there may be two loading plates, one of which may be arranged in parallel on the flat plate 2121 , and the other of which may be arranged in parallel on the avoidance inclined plate 2122 .
[0044] Preferably, if Figure 4 and Figure 5 As shown, the inner side of the back plate 212 may be provided with supporting ribs 2123, which are arranged along both side edges of the back plate 212 in the third direction F3. The loading plate is mounted on the supporting ribs 2123 at both ends in the third direction F3, forming a receiving gap between the loading plate and the back plate 212. This receiving gap reserves space between the loading plate and the back plate 212, not only providing space for the fasteners securing the loading plate and components, as well as for the wiring arrangement of the components, thereby preventing wear caused by compression between the fasteners, wiring, and components, but also effectively improving the heat dissipation efficiency of the components.
[0045] Preferably, if Figure 4 and Figure 5 As shown, the supporting rib 2123 can be formed integrally with the back plate 212 by bending to improve the manufacturing efficiency of the box body 21.
[0046] Preferably, if Figure 4 As shown, the supporting protrusion may be provided with a fixing hole, and the loading plate may be fixedly connected to the supporting protrusion by a fastener (such as a screw) passing through the fixing hole.
[0047] In an embodiment, Figure 1 and Figure 2As shown, preferably, the box body 21 may further include a hinge bar 24, which may extend along the first direction F1. A hinge bar 24 is provided on the side of one of the two side panels 214 facing the box door portion 22. The box door portion 22 is hinged to the box body 21 via the hinge bar 24. In this way, the hinged contact area between the box door and the box body 21 is increased, the force during opening and closing is dispersed, the stability and structural strength of the box door opening and closing are improved, the service life is extended, and the frequent maintenance problem caused by the easy damage of traditional hinges is avoided.
[0048] Correspondingly, both ends of the door portion 22 in the first direction F1 may be provided with hinge ears, which may be respectively provided on both sides of the hinge bar 24 in the first direction F1, and the control box may include a hinge axis extending along the first direction F1.
[0049] Optionally, the hinge shaft may pass through the hinge bar 24 and the hinge ears at both ends of the hinge bar 24 in the first direction F1 to achieve the hinge connection between the door portion 22 and the box body portion 21 .
[0050] Optionally, the hinge shaft may be fixed to both ends of the hinge shaft in the first direction F1 and pass through the hinge ears at the corresponding ends respectively.
[0051] Optionally, the hinge shaft can be fixed to the side of the hinge ear facing the hinge bar 24, and the two ends of the hinge bar 24 can be provided with hinge grooves. The hinge shaft fixed to the hinge ear can be clamped in the hinge groove to realize the hinge connection of the door part 22 and the box body part 21.
[0052] Alternatively, as Figure 1 and Figure 2 As shown, the above-mentioned door portion 22 can be provided with a plurality of mounting holes for embedding control devices (for example, display screens, switches, warning lights), and the control devices can be communicated with the components in the control box to achieve control and monitoring of the components in the control box only through the control devices of the door portion 22 without opening the door portion 22.
[0053] Alternatively, as Figure 2 As shown, the side panel 214 may also be provided with a threading hole passing through the side panel 214 along a third direction F3, and the control device may be communicated with the components in the control box through the threading hole. In this way, by external threading, it is possible to effectively avoid the connection between the control device and the components interfering with the opening and closing of the door portion 22.
[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A ring main unit, characterized in that: It includes a cabinet body and a control box that are detachably connected to each other, the first of the cabinet body and the control box being provided with a limiting protrusion, the second of the cabinet body and the control box being provided with a limiting card slot that is adapted to the shape of the limiting protrusion, the limiting protrusion and the limiting card slot being respectively provided with corresponding positions of the side walls of the cabinet body and the control box facing each other, so that when the cabinet body and the control box are in an assembled state, the limiting protrusion is clamped in the limiting card slot.
2. The ring main unit according to claim 1, characterized in that: The control box includes a box body and a box door that are hinged to each other; The box body includes a top plate, a back plate, a bottom plate, and two side plates, wherein the top plate, the back plate, and the bottom plate are connected end to end in sequence, wherein the top plate and the bottom plate are arranged opposite to each other along a first direction, the box door portion is arranged between the top plate and the bottom plate, and the box door portion and the back plate are arranged opposite to each other along a second direction, and the first direction is perpendicular to the second direction; The connector of the top plate, the back plate and the bottom plate and the door portion form a cylindrical structure extending along a third direction, and the two side plates are respectively arranged on both sides of the cylindrical structure in the third direction, and the third direction is perpendicular to the plane determined by the first direction and the second direction.
3. The ring main unit according to claim 2, characterized in that: The top plate, the back plate and the bottom plate are an integral bent part.
4. The ring main unit according to claim 2, characterized in that: The control box and the cabinet body are stacked along the first direction, and the limit slot is provided on the bottom plate; The bottom plate is provided with a hollow area penetrating the bottom plate to provide a channel for line connection between the control box and the cabinet body.
5. The ring main unit according to claim 4, characterized in that: A lifting lug is provided on the side of the cabinet body facing the control box; One end of the control box door is aligned with one end of the cabinet body in the second direction; In the second direction, the size of the cabinet body is larger than that of the control box; The lifting lug is provided on a portion of the cabinet body that extends beyond the control box in the second direction.
6. The ring main unit according to claim 5, characterized in that: The back plate further comprises a flat plate and an avoidance inclined plate connected to each other, wherein the flat plate is arranged perpendicular to the second direction, the flat plate is connected to the top plate, and the avoidance inclined plate is connected to the bottom plate; Along the first direction, in a direction from the end of the avoidance inclined plate connected to the flat plate to the other end, the avoidance inclined plate gradually tilts toward a side away from the lifting ear.
7. The ring main unit according to any one of claims 2 to 6, characterized in that: The control box further comprises a loading plate, which is provided with mounting holes for placing components. The loading plate is arranged in the box body, the loading plate is arranged parallel to the back plate, and the loading plate is detachably connected to the back plate.
8. The ring main unit according to claim 7, characterized in that: The inner side of the back plate is provided with supporting ribs, and the supporting ribs are provided along the two side edges of the back plate in the third direction; The two ends of the loading plate in the third direction are respectively mounted on the supporting ribs to form an accommodating gap between the loading plate and the back plate.
9. The ring main unit according to claim 2, characterized in that: The box body also includes a hinge bar extending along the first direction. The hinge bar is provided on a side of one of the two side panels facing the box door. The box door is hinged to the box body via the hinge bar.
10. The ring main unit according to claim 2, characterized in that: The limiting protrusion is a columnar structure extending along the first direction, and the size of the columnar structure in the second direction is not equal to the size thereof in the third direction.