An internally visualized ring main unit gas box and its assembly process

Abstract

This application provides an internally visualized ring main unit gas box and its assembly process. The gas box includes a housing with a rear plate, a flange, an observation window, a viewing hole, and first studs. The first studs are located on the inner side of the rear plate and around the viewing hole. The flange is nested within the viewing hole, and a second stud is located on the outer side of the flange. The observation window is mounted on the outer side of the flange based on the second studs. A three-position switch is located inside the gas box housing, with the position of the viewing hole corresponding to the position of the three-position switch. A multi-point source distributed diffuser illuminates the three-position switch. This embodiment effectively observes the contact conditions between the contacts, achieving fixed-point visualization of all three-position switches, improving the sealing of the observation window within the viewing hole, and preventing air leakage due to the excessive size of the observation window.

Description

Technical Field

[0001] This application relates to the field of ring main units, and in particular to an internally visualized ring main unit air box and its assembly process. Background Technology

[0002] Currently, existing ring main units are mainly gas-insulated and solid-insulated ring main units. Gas-insulated ring main units include SF6 gas-insulated ring main units, dry air environmental protection units, and nitrogen environmental protection units, which are widely used due to their excellent insulation performance, ease of processing, and low cost. Their internal three-position switches achieve isolation / disconnection / grounding switching by swinging the moving contact, thus meeting different operating conditions. However, during the swinging process of the moving contact, over-swing or under-swinging phenomena can easily occur, reducing the contact area between the moving and stationary contacts or between the moving and grounding contacts. This can cause overheating in the contact area, severely damaging the normal operation of the ring main unit, and is particularly common in shared-enclosure ring main units.

[0003] In existing technologies, most ring main unit (RNB) gas boxes have observation windows on the front panel to monitor the status of internal switches. However, the front panel also needs to support various mechanical and electrical components such as circuit breaker mechanisms and isolation mechanisms. Furthermore, the larger the observation window, the more prone it is to leaks. This results in existing observation windows being very small, and their placement must consider the location of various components, making it impossible to effectively observe the status of all switches. Simultaneously, the interior of current RNB gas boxes is dark, requiring personnel to use flashlights to observe through the observation windows one by one. This makes it difficult to effectively observe the contact conditions between the contacts, hindering effective inspection and leading to frequent RNB failures due to poor contact. Summary of the Invention

[0004] The main objective of this application is to propose an internally visualized ring main unit air box and its assembly process. Through the observation window and multi-point source distributed diffused light, the contact condition between the contact blades can be effectively observed, achieving a fixed-point visualization effect for all three-position switches. Furthermore, the interlocking of the flange, observation window, and viewing hole improves the sealing performance of the observation window within the viewing hole, preventing air leakage due to the excessive size of the observation window.

[0005] To achieve the above objectives, a first aspect of this application proposes an internally visualized ring main unit gas box, comprising: a gas box shell, the gas box shell including a gas box rear plate, the gas box rear plate including a flange, an observation window, a viewing hole, and a first stud, the first stud being disposed on the inner side of the gas box rear plate and located around the viewing hole, the viewing hole penetrating the gas box rear plate, the flange being nested in the viewing hole, the center of the flange overlapping with the center of the viewing hole, a second stud being disposed on the outer side of the flange, and the observation window being mounted on the outer side of the flange based on the second stud; a three-position switch, the three-position switch being disposed inside the gas box shell, the position of the viewing hole corresponding to the position of the three-position switch; and a multi-point source distributed diffuser, the multi-point source distributed diffuser being mounted on the inner side of the gas box rear plate based on the first stud, the center of the multi-point source distributed diffuser overlapping with the center of the viewing hole, and the illumination range of the multi-point source distributed diffuser covering the three-position switch.

[0006] Furthermore, in some embodiments, the rear panel of the air box further includes: a plurality of first reinforcing ribs, the first reinforcing ribs being horizontally disposed on the outer side of the rear panel of the air box and located above or below the viewing hole, the first reinforcing ribs being parallel to each other, the first reinforcing ribs having an arch bridge-shaped structure, the first reinforcing ribs including a plurality of grooves disposed on the upper wall surface of the first reinforcing ribs, the grooves including a plurality of first rectangular holes; and a plurality of second reinforcing ribs, the second reinforcing ribs being vertically disposed on the outer side of the rear panel of the air box and located to the left or right of the viewing hole, the second reinforcing ribs being parallel to each other, the second reinforcing ribs having an arch bridge-shaped structure, the second reinforcing ribs being... The rib includes multiple bosses and multiple boss-holes, with the positions of the boss-holes corresponding one-to-one with the positions of the bosses. The boss-holes are located on the upper wall surface of the second reinforcing rib. The bosses include multiple meshing teeth, which are located on the side wall surface of the second reinforcing rib. The meshing teeth include multiple second rectangular holes and multiple rectangular protrusions. The side wall surface of the first reinforcing rib meshes with the second rectangular holes, and the rectangular protrusions mesh with the first rectangular holes. The height of the second reinforcing rib is equal to the sum of the height of the first reinforcing rib and the thickness of the upper wall surface of the second reinforcing rib. The boss-holes are used as welding connection holes after the first and second reinforcing ribs mesh with each other.

[0007] Furthermore, in some embodiments, the rear panel of the air box also includes a plurality of third reinforcing ribs, which are horizontally disposed on the inner side of the rear panel of the air box and located above or below the viewing hole, and the third reinforcing ribs are parallel to each other.

[0008] Furthermore, in some embodiments, the flange is an annular structure with a wall thickness greater than 6mm. The inner ring diameter of the flange is smaller than the diameter of the viewing hole, while the outer ring diameter is larger than the diameter of the viewing hole. The outer ring of the flange is welded to the outer side of the rear plate of the gas box using a closed circumferential full welding method, and the inner ring of the flange is welded to the inner side of the rear plate of the gas box using a closed circumferential full welding method.

[0009] Furthermore, in some embodiments, the observation window includes a circular groove and a sealing ring. The circular groove is disposed on the inner wall surface of the observation window, and the sealing ring is embedded in the circular groove. The sealing ring is in close contact with the flange.

[0010] Furthermore, in some embodiments, the multi-point source distributed diffuser includes: multiple diffusers connected in parallel; multiple explosion-proof housings disposed above the diffusers, each housing including multiple light-transmitting holes distributed in a honeycomb pattern on the surface of the housing and penetrating through the housing; a lamp holder including multiple sub-lamp holders, the lamp holder forming a clover-shaped structure based on the positional distribution of the sub-lamp holders, the center of the lamp holder having a hollow design, each sub-lamp holder including a first lamp surface and a second lamp surface, the sub-lamp holder forming a flat Z-shaped structure based on the positional distribution of the first lamp surface and the second lamp surface, the distance from the first lamp surface to the center of the viewing hole being less than the distance from the second lamp surface to the center of the viewing hole; wherein, the first lamp surface includes multiple first mounting holes for mounting the sub-lamp holders on the inner side of the rear panel of the gas box, the second lamp surface includes multiple second mounting holes and multiple third mounting holes, the second mounting holes for mounting the diffusers above the sub-lamp holders, and the third mounting holes for mounting the explosion-proof housings above the sub-lamp holders.

[0011] Furthermore, in some embodiments, the three-position switch includes a moving contact, a stationary contact, a grounding contact, and a swing sleeve. The moving contact is disposed inside the swing sleeve, which is used to rotate the moving contact. The moving contact is connected to the stationary contact based on the rotation of the swing sleeve, or the moving contact is connected to the grounding contact based on the rotation of the swing sleeve.

[0012] Furthermore, in some embodiments, the gas box shell also includes a gas box side plate and a gas box front plate. The gas box side plate is connected to the gas box rear plate, and the gas box front plate is connected to the gas box side plate. The connection between the gas box front plate and the gas box side plate is a full weld connection, and the connection between the gas box side plate and the gas box rear plate is a full weld connection. The gas box front plate, gas box side plate, and gas box rear plate are all stainless steel sheet structures, and the thickness of the gas box front plate, gas box side plate, and gas box rear plate is greater than or equal to 3mm.

[0013] Furthermore, in some embodiments, the ring main unit air box also includes an operating mechanism, which is located on the outer side of the front plate of the air box and is connected to the swing shaft sleeve. The operating mechanism is used to control the three-position switch.

[0014] To achieve the above objectives, a second aspect of this application proposes a ring main unit gas box assembly process, applying the ring main unit gas box of the first aspect, including: fully welding the gas box front plate and the gas box side plate to obtain a gas box shell semi-finished product; assembling a three-position switch inside the gas box shell semi-finished product; installing an operating mechanism onto the gas box front plate and connecting the operating mechanism to the three-position switch; interlocking multiple first reinforcing ribs and multiple second reinforcing ribs, and welding the interlocking points between the first reinforcing ribs and the second reinforcing ribs; after the first reinforcing ribs and the second reinforcing ribs are interlocked and welded, the upper wall surface of the first reinforcing ribs and the upper wall surface of the second reinforcing ribs are welded based on the boss holes to obtain a reinforcing rib structure, the reinforcing rib structure including multiple first reinforcing ribs and multiple second reinforcing ribs, each... The first reinforcing ribs and the second reinforcing ribs interlock and mesh; the reinforcing rib structure is welded to the outer side of the rear plate of the gas box; the flange is welded to the inside of the viewing hole in a closed circumferential full welding manner; the observation window is installed in the second stud of the flange by bolts; a multi-point source distributed diffuser is installed on the inner side of the rear plate of the gas box, and the center of the multi-point source distributed diffuser overlaps with the center of the viewing hole; the rear plate of the gas box is installed in the semi-finished gas box shell in a full welding connection to obtain the ring main unit gas box; wherein, the closed circumferential full welding of the flange to the inside of the viewing hole includes the following steps: a closed circumferential full welding connection is made between the inner side of the rear plate of the gas box and the inner ring of the flange; a closed circumferential full welding connection is made between the outer side of the rear plate of the gas box and the outer ring of the flange.

[0015] The embodiments of this application have the following beneficial effects: This application includes a gas box housing, a three-position switch, and a multi-point source distributed diffuser. The gas box housing includes a rear plate, which includes a flange, an observation window, a viewing hole, and a first stud. The first stud is located on the inner side of the rear plate and around the viewing hole. The viewing hole penetrates the rear plate, and its position corresponds to the position of the three-position switch. The flange is nested within the viewing hole, and the center of the flange overlaps with the center of the viewing hole. A second stud is provided on the outer side of the flange, and the observation window is mounted on the outer side of the flange based on the second stud. The three-position switch... The switch is located inside the gas box shell. The multi-point source distributed diffused light is installed on the inner side of the rear plate of the gas box based on the first stud. The center of the multi-point source distributed diffused light overlaps with the center of the viewing hole. The illumination range of the multi-point source distributed diffused light covers the three-position switch. Through the observation window and the multi-point source distributed diffused light, the contact condition between the contact blades can be effectively observed, realizing the fixed-point visualization effect of all three-position switches. Furthermore, the interlocking between the flange, the observation window and the viewing hole improves the sealing of the observation window in the viewing hole, preventing air leakage due to the excessive size of the observation window. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the outer side of the rear panel of a ring main unit air box, which is visualized internally according to an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the inner side of the rear panel of the air box provided in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the structure of the three-position switch provided in the embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the structure of the operating mechanism provided in the embodiments of this application;

[0020] Figure 5 This is a schematic diagram of the structure of the first and second reinforcing ribs provided in the embodiments of this application;

[0021] Figure 6 This is a schematic diagram of the structure of the multi-point source distributed diffuser provided in the embodiments of this application;

[0022] Figure 7 This is a schematic diagram of the interlocking structure between the first and second reinforcing ribs provided in the embodiments of this application;

[0023] Figure 8 This is a schematic diagram of the flange structure provided in the embodiments of this application;

[0024] Figure 9 This is a schematic diagram of the structure of the observation window provided in the embodiment of this application;

[0025] Figure 10 This is a schematic diagram of the structure of the lamp holder provided in the embodiment of this application;

[0026] Figure 11 This is a schematic diagram of the structure of the explosion-proof shell provided in the embodiments of this application;

[0027] Figure 12 This is a schematic diagram of an optional assembly process for the ring main unit gas box provided in the embodiments of this application.

[0028] Reference numerals: Air box shell 100, air box rear plate 110, air box front plate 120, air box side plate 130, flange 210, second stud 211, observation window 220, circular groove 221, sealing ring 222, viewing hole 230, first stud 240, first reinforcing rib 250, groove 251, first rectangular vent hole 252, second reinforcing rib 260, boss 261, boss vent hole 262, third reinforcing rib 270, meshing tooth 280, etc. Two rectangular perforations 281, rectangular protrusions 282, three-position switch 300, moving contact blade 310, stationary contact blade 320, grounding contact blade 330, swing bushing 340, multi-point source distributed diffuser 400, diffuser 410, explosion-proof housing 420, light-transmitting hole 421, lamp holder 430, sub-lamp holder 431, first lamp surface 440, first mounting hole 441, second lamp surface 450, second mounting hole 451, third mounting hole 452, operating mechanism 500. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to be limiting of this application.

[0032] In existing technologies, most ring main unit (RNB) gas boxes have observation windows on the front panel to monitor the status of internal switches. However, the front panel also needs to support various mechanical and electrical components such as circuit breaker mechanisms and isolation mechanisms. Furthermore, the larger the observation window, the more prone it is to leaks. This results in existing observation windows being very small, and their placement must consider the placement of various components, making it impossible to effectively observe the status of all switches. Simultaneously, the interior of current RNB gas boxes is dark, requiring personnel to use flashlights to observe through the observation windows one by one. This makes it difficult to effectively observe the contact conditions between the contacts, hindering effective inspection and leading to frequent RNB failures due to poor contact.

[0033] Based on this, the system includes a gas box housing 100, a three-position switch 300, and a multi-point source distributed diffused light 400. The gas box housing 100 includes a gas box rear plate 110, which includes a flange 210, an observation window 220, a viewing hole 230, and a first stud 240. The first stud 240 is located on the inner side of the gas box rear plate 110 and around the viewing hole 230, which penetrates through the gas box rear plate 110. The flange 210 is nested within the viewing hole 230, with the center of the flange 210 overlapping with the center of the viewing hole 230. A second stud 211 is provided on the outer side of the flange 210, and the observation window 220 is mounted on the outer side of the flange 210 based on the second stud 211. The three-position switch 300 is located inside the gas box housing 100. The position of 230 corresponds to the position of the three-position switch 300. The multi-point source distributed diffused light 400 is installed on the inner side of the air box rear plate 110 based on the first stud 240. The center of the multi-point source distributed diffused light 400 overlaps with the center of the viewing hole 230. The illumination range of the multi-point source distributed diffused light 400 covers the three-position switch 300. Thus, through the observation window 220 and the multi-point source distributed diffused light 400, the contact condition between the contact blades can be effectively observed, realizing the fixed-point visualization effect of all three-position switches 300. Furthermore, through the interlocking of the flange 210, the observation window 220 and the viewing hole 230, the sealing performance of the observation window 220 in the viewing hole 230 is improved, preventing air leakage due to the excessive size of the observation window 220.

[0034] The internally visualized ring main unit gas box and its assembly process provided in this application embodiment are specifically described through the following embodiments. First, the internally visualized ring main unit gas box in this application embodiment is described.

[0035] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0036] Reference Figure 1 , Figure 3 , Figure 6 , Figure 8 and Figure 9 , Figure 1 This is a schematic diagram of the outer side of the rear panel of a ring main unit gas box, which is an internally visualized embodiment of this application. Figure 3 This is a schematic diagram of the structure of the three-position switch provided in the embodiment of this application. Figure 6 This is a schematic diagram of the structure of the multi-point source distributed diffuser provided in the embodiments of this application. Figure 8 This is a schematic diagram of the flange structure provided in the embodiments of this application. Figure 9 This is a schematic diagram of the observation window provided in an embodiment of this application. This embodiment of the application provides an internally visualized ring main unit gas box, including:

[0037] The air box housing 100 includes a rear air box plate 110, which includes a flange 210, an observation window 220, a viewing hole 230, and a first stud 240. The first stud 240 is located on the inner side of the rear air box plate 110 and around the viewing hole 230. The viewing hole 230 passes through the rear air box plate 110. The flange 210 is nested in the viewing hole 230. The center of the flange 210 overlaps with the center of the viewing hole 230. A second stud 211 is provided on the outer side of the flange 210. The observation window 220 is installed on the outer side of the flange 210 based on the second stud 211.

[0038] Three-position switch 300 is located inside the gas box housing 100, wherein the position of the viewing hole 230 corresponds to the position of the three-position switch 300.

[0039] The multi-point source distributed diffuser 400 is mounted on the inner side of the rear plate 110 of the air box based on the first stud 240. The center of the multi-point source distributed diffuser 400 overlaps with the center of the viewing hole 230. The illumination range of the multi-point source distributed diffuser 400 covers the three-position switch 300.

[0040] There can be multiple three-position switches 300. The number of three-position switches is set according to the actual power distribution system requirements, safety regulations, technical standards, and economic costs.

[0041] The viewing hole 230 is a circular aperture located near the same height as the three-position switch 300, allowing direct observation of the switch's contact state. The number of viewing holes 230 is determined by the number of switches inside the gas chamber; if the number of three-position switches 300 inside the gas chamber is n, then the number of viewing holes 230 is n-1. The diameter of the viewing hole 230 is larger than the minor diameter of the flange 210 but smaller than the major diameter of the flange 210. For example, refer to... Figure 3 If there are four three-way switches inside the air box, then three viewing holes 230 are provided on the rear plate 110 of the air box.

[0042] There can be multiple first studs 240, which are evenly distributed around the viewing hole 230. At least two first studs 240 are provided in each direction of the viewing hole 230, such as eight first studs 240 around the viewing hole 230 and two first studs 240 in each direction of the viewing hole 230.

[0043] There can be multiple second studs 211. Since the observation window 220 is installed on the outer side of the flange 210 based on the second studs 211, the number of screw holes provided on the observation window 220 is the same as the number of second studs 211.

[0044] Based on this, the system includes a gas box housing 100, a three-position switch 300, and a multi-point source distributed diffused light 400. The gas box housing 100 includes a gas box rear plate 110, which includes a flange 210, an observation window 220, a viewing hole 230, and a first stud 240. The first stud 240 is located on the inner side of the gas box rear plate 110 and is situated around the viewing hole 230. The viewing hole 230 penetrates the gas box rear plate 110, and its position corresponds to that of the three-position switch 300. The flange 210 is nested within the viewing hole 230, with the center of the flange 210 overlapping with the center of the viewing hole 230. A second stud 211 is provided on the outer side of the flange 210, and the observation window 220 is mounted on the outer side of the flange 210 based on the second stud 211. The three-position switch 300 is located inside the gas box housing 100. The multi-point source distributed diffused light 400 is mounted on the inner side of the gas box rear plate 110 based on the first stud 240. The center of the multi-point source distributed diffused light 400 overlaps with the center of the viewing hole 230. The illumination range of the multi-point source distributed diffused light 400 covers the three-position switch 300. Thus, through the observation window 220 and the multi-point source distributed diffused light 400, the contact condition between the contact blades can be effectively observed, realizing the fixed-point visualization effect of all three-position switches 300. Furthermore, through the interlocking of the flange 210, the observation window 220 and the viewing hole 230, the sealing performance of the observation window 220 in the viewing hole 230 is improved, preventing air leakage due to the excessive size of the observation window 220.

[0045] refer to Figure 1 , Figure 5 and Figure 7 , Figure 5 This is a schematic diagram of the structure of the first and second reinforcing ribs provided in the embodiments of this application. Figure 7 This is a schematic diagram of the interlocking structure between the first and second reinforcing ribs provided in the embodiment of this application. The embodiment of this application provides an internally visualized ring main unit air box. The air box rear plate 110 further includes: a plurality of first reinforcing ribs 250. The first reinforcing ribs 250 are horizontally arranged on the outer side of the air box rear plate 110 and located above or below the viewing hole 230. The first reinforcing ribs 250 are parallel to each other. The structure of the first reinforcing ribs 250 is an arch bridge structure. The first reinforcing ribs 250 include a plurality of grooves 251. The grooves 251 are arranged on the upper wall surface of the first reinforcing ribs 250. The grooves 251 include a plurality of first rectangular holes 252.

[0046] Multiple second reinforcing ribs 260 are vertically arranged on the outer side of the rear plate 110 of the air box and located on the left or right side of the viewing hole 230. The second reinforcing ribs 260 are parallel to each other and have an arch bridge structure. Each second reinforcing rib 260 includes multiple bosses 261 and multiple boss holes 262. The positions of the boss holes 262 correspond one-to-one with the positions of the bosses 261. The boss holes 262 are located on the upper wall surface of the second reinforcing rib 260. Each boss 261 includes multiple meshing teeth 280. The meshing teeth 280 are located on the side wall surface of the second reinforcing rib 260. Each meshing tooth 280 includes multiple second rectangular holes 281 and multiple rectangular protrusions 282.

[0047] The side wall of the first reinforcing rib 250 engages with the second rectangular hole 281, the rectangular protrusion 282 engages with the first rectangular hole 252, the height of the second reinforcing rib 260 is equal to the sum of the height of the first reinforcing rib 250 and the thickness of the upper wall of the second reinforcing rib 260, and the protrusion hole 262 is used as a welded connection hole after the first reinforcing rib 250 and the second reinforcing rib 260 engage with each other.

[0048] It should be noted that the first reinforcing rib 250 and the second reinforcing rib 260, after being welded together, form a cross-shaped reinforcing rib structure. Multiple first reinforcing ribs 250 and multiple second reinforcing ribs 260 combine to form a mesh-like reinforcing rib network. The viewing hole 230 is located within this mesh. Generally, the distance from the top of the viewing hole 230 to the first reinforcing rib 250 is equal to the distance from the bottom of the viewing hole 230 to the first reinforcing rib 250. Similarly, the distance from the left side of the viewing hole 230 to the second reinforcing rib 260 is equal to the distance from the right side of the viewing hole 230 to the second reinforcing rib 260. Based on this, the pressure around the viewing hole 230 is distributed evenly by the first reinforcing ribs 250 and the second reinforcing ribs 260, preventing excessive pressure in any area around the viewing hole 230 and thus preventing localized deformation of the rear plate 110 of the air box. This improves the structural rigidity and deformation resistance of the rear plate 110 of the air box around the viewing hole 230.

[0049] It should be noted that each of the first reinforcing ribs 250 and the second reinforcing ribs 260 is welded at a welding point at regular intervals on the rear plate 110 of the air box, so that each of the first reinforcing ribs 250 and the second reinforcing ribs 260 can be fixed on the rear plate 110 of the air box. At the same time, the wall thickness of each of the first reinforcing ribs 250 and the second reinforcing ribs 260 is at least 3 mm, and the length of the first reinforcing rib 250 is basically equal to the length of the long side of the rear plate 110 of the air box.

[0050] Based on this, by setting multiple first reinforcing ribs 250 and multiple second reinforcing ribs 260, and the first reinforcing ribs 250 and the second reinforcing ribs 260 can mesh with each other, the welded connection hole after the first reinforcing ribs 250 and the second reinforcing ribs 260 mesh with each other can be welded, which can improve the rigidity of the reinforcing ribs, thereby suppressing the deformation of the rear plate 110 of the air box and preventing the gas inside the air box from easily leaking through the observation window 220.

[0051] refer to Figure 2 , Figure 2 This is a schematic diagram of the inner side of the air box rear plate provided in the embodiment of this application. The embodiment of this application provides an internally visualized ring network cabinet air box. The air box rear plate 110 also includes a plurality of third reinforcing ribs 270. The third reinforcing ribs 270 are horizontally arranged on the inner side of the air box rear plate 110 and located above or below the viewing hole 230. The third reinforcing ribs 270 are parallel to each other.

[0052] The wall thickness of the third reinforcing rib 270 is at least 3 mm, and the length of the third reinforcing rib 270 is equivalent to the length of the first reinforcing rib 250.

[0053] It should be noted that, due to the good airtightness of the ring main unit's gas box, the gas inside the gas box is sensitive to the temperature of the gas box. When the temperature around the gas box drops suddenly, the gas inside the gas box contracts, and the external atmospheric pressure exerts a greater force on the box wall, which will cause the gas box to be subjected to an inward force. Since the first reinforcing rib 250 and the second reinforcing rib 260 are located on the outside of the gas box rear plate 110, they cannot effectively resist the inward force.

[0054] Based on this, by setting multiple third reinforcing ribs 270, which are horizontally arranged on the inner side of the rear plate 110 of the gas box and located above or below the viewing hole 230, and with each third reinforcing rib 270 parallel to each other, the inward deformation of the rear plate 110 of the gas box can be effectively prevented, thus solving the problem that the gas inside the gas box can easily leak through the observation window 220.

[0055] refer to Figure 1 , Figure 2 , Figure 6 and Figure 8 This application provides an internally visualized ring main unit gas box. The flange 210 has an annular structure and a wall thickness greater than 6mm. The inner diameter of the flange 210 is smaller than the diameter of the viewing hole 230, and the outer diameter of the flange 210 is larger than the diameter of the viewing hole 230. The outer ring of the flange 210 is welded to the outer side of the gas box rear plate 110 in a closed circumferential full welding manner, and the inner ring of the flange 210 is welded to the inner side of the gas box rear plate 110 in a closed circumferential full welding manner.

[0056] Based on this, by designing the wall thickness of flange 210 to be greater than 6mm, the structural strength of flange 210 can be increased, preventing deformation of flange 210 from causing air leakage in the ring main unit's gas box. By designing the inner ring diameter of flange 210 to be smaller than the diameter of the viewing hole 230, and the outer ring diameter of flange 210 to be larger than the diameter of the viewing hole 230, the outer ring of flange 210 is welded to the outer side of the gas box rear plate 110 in a closed circumferential full welding manner, and the inner ring of flange 210 is welded to the inner side of the gas box rear plate 110 in a closed circumferential full welding manner, the flatness from the gas box rear plate 110 to the surface of flange 210 and the integration degree of gas box rear plate 110 and flange 210 can be increased, so that the flange 210 area is subjected to uniform stress and is less likely to have micro-pores that cause air leakage in the ring main unit's gas box.

[0057] refer to Figure 1 , Figure 2 , Figure 6 and Figure 9 This application provides an internally visualized ring main unit air box. The observation window 220 includes a circular groove 221 and a sealing ring 222. The circular groove 221 is disposed on the inner wall surface of the observation window 220, and the sealing ring 222 is embedded in the circular groove 221. The sealing ring 222 is in close contact with the flange 210.

[0058] The height of the flange on the outer ring of the circular groove 221 is the same as the height of the inner wall of the observation window 220, and the height of the flange on the inner ring of the circular groove 221 must be at least equal to the wall thickness of the flange 210 plus the wall thickness of the observation window 220.

[0059] Among them, the contact blades of the three-position switch can be observed at a fixed point through the observation window 220, eliminating the need to deliberately search for the contact blade positions of the three-position switch 300, which facilitates the maintenance work of the staff.

[0060] Based on this, the sealing ring 222 tightly connects the observation window 220 with the flange 210, which can maintain the good airtightness of the ring main unit's air box, keep the flatness of the contact surface between the observation window 220 and the flange 210, prevent the deformation of the rear plate 110 of the air box, and improve the airtightness of the ring main unit's air box.

[0061] refer to Figure 6 , Figure 10 and Figure 11 , Figure 10 This is a schematic diagram of the structure of the lamp holder provided in the embodiment of this application. Figure 11 This is a structural schematic diagram of the explosion-proof enclosure provided in an embodiment of this application. This embodiment provides an internally visualized ring main unit gas box, and the multi-point source distributed diffuser 400 also includes:

[0062] Multiple diffuser lamps 410 are connected in parallel with each other;

[0063] Multiple explosion-proof housings 420 are provided above the diffuser 410. Each explosion-proof housing 420 includes multiple light-transmitting holes 421, which are distributed in a honeycomb pattern on the surface of the explosion-proof housing 420 and penetrate through the explosion-proof housing 420.

[0064] The lamp holder 430 includes multiple sub-lamp holders 431. The lamp holder 430 forms a four-leaf clover-shaped structure based on the positional distribution of each sub-lamp holder 431. The center of the lamp holder 430 has a hollow design. Each sub-lamp holder 431 includes a first lamp surface 440 and a second lamp surface 450. The sub-lamp holder 431 forms a flat Z-shaped structure based on the positional distribution of the first lamp surface 440 and the second lamp surface 450. The distance from the first lamp surface 440 to the center of the viewing hole 230 is less than the distance from the second lamp surface 450 to the center of the viewing hole 230.

[0065] The first lamp surface 440 includes multiple first mounting holes 441 for mounting the sub-lamp holder 431 on the inner side of the rear plate 110 of the gas box. The second lamp surface 450 includes multiple second mounting holes 451 and multiple third mounting holes 452. The second mounting holes 451 are used to mount the diffuser 410 above the sub-lamp holder 431, and the third mounting holes 452 are used to mount the explosion-proof shell 420 above the sub-lamp holder 431.

[0066] The diffuser 410 and the explosion-proof housing 420 are both flat in shape, and can be flat cuboids, strips, or discs; this application does not limit the design. This design helps to reduce the space occupied by the diffuser 410, keeping it as far away from the three-position switch 300 as possible, increasing the insulation distance between high and low voltage, ensuring the insulation reliability of the ring main unit enclosure, and improving heat dissipation.

[0067] In one possible implementation, the explosion-proof shell 420 uses a material ratio of 70% nylon and 30% glass fiber.

[0068] The diffuser 410 is fixed to the lamp holder 430 by bolts and the second mounting hole 451.

[0069] The height difference between the first lamp surface 440 and the second lamp surface 450 is exactly the length that the small end of the bolt can extend when the bolt is tightened. This allows the diffused light 410 to be further away from the three-position switch 300 to the maximum extent, increasing the insulation distance from high voltage to low voltage and ensuring the insulation reliability of the ring main unit.

[0070] Since the multi-point source distributed diffused light 400 is mounted on the inner side of the rear plate 110 of the air box based on the first stud 240, the number of the first mounting holes 441 is equal to the number of the first studs 240.

[0071] Based on this, by designing the multi-point source distributed diffuser 400 with multiple diffusers 410, and the sub-lamp holder 431 being clover-shaped and evenly distributed around the viewing hole 230, the diffusers 410 are mounted on the sub-lamp holder 431, achieving full-area illumination of the gas box environment, ensuring that the illuminated contact area of ​​the three-position switch 300 is shadowless, facilitating observation by staff; by designing the multi-point source distributed diffuser 400 with multiple explosion-proof housings 420, the diffusers 410 can be protected from electric arcs, flashovers, etc. when the three-position switch 300 is activated, and the surface of the explosion-proof housing 420 is provided with dense light-transmitting holes 421, allowing the light source of the diffusers 410 to pass through normally.

[0072] In one possible implementation, the diffuser 410 is fixed to the lamp holder 430 by a snap fastener and a second mounting hole 451, and correspondingly, the height difference between the first lamp surface 440 and the second lamp surface 450 is the length that the snap fastener can extend relative to the first lamp surface 440.

[0073] refer to Figure 3 This application provides an internally visualized ring main unit gas box. The three-position switch 300 includes a moving contact 310, a stationary contact 320, a grounding contact 330, and a swing sleeve 340. The moving contact 310 is disposed inside the swing sleeve 340. The swing sleeve 340 is used to rotate the moving contact 310. The moving contact 310 is connected to the stationary contact 320 based on the rotation of the swing sleeve 340, or the moving contact 310 is connected to the grounding contact 330 based on the rotation of the swing sleeve 340.

[0074] Based on this, the moving contact 310 is rotated by the swing sleeve 340, and the moving contact 310 is connected to the stationary contact 320 based on the rotation of the swing sleeve 340, or the moving contact 310 is connected to the grounding contact 330 based on the rotation of the swing sleeve 340. This can meet different working conditions and prevent misoperation, and ensure the safe conduct of maintenance work when equipment needs to be inspected or maintained.

[0075] refer to Figure 1 and Figure 4 This application provides an internally visualized ring main unit gas box. The gas box shell 100 also includes a gas box side plate 130 and a gas box front plate 120. The gas box side plate 130 is connected to the gas box rear plate 110, and the gas box front plate 120 is connected to the gas box side plate 130. The connection between the gas box front plate 120 and the gas box side plate 130 is a full weld connection, and the connection between the gas box side plate 130 and the gas box rear plate 110 is a full weld connection.

[0076] Among them, the front plate 120, the side plate 130, and the rear plate 110 of the air box are all made of stainless steel sheet, and the thickness of the front plate 120, the side plate 130, and the rear plate 110 is greater than or equal to 3mm.

[0077] First, the front plate 120 and the side plate 130 of the air box need to be welded. After the components are installed inside the air box, the rear plate 110 of the air box is then welded on to form a sealed shell.

[0078] Based on this, by using full welding to connect the front plate 120 and the side plate 130 of the gas box, and to connect the side plate 130 and the rear plate 110 of the gas box, the airtightness of the ring main unit gas box can be maximized, and the rigidity of the entire ring main unit gas box can be improved. Even in complex and changeable outdoor environments, the ring main unit gas box is not easily damaged, which is conducive to improving the stability of the power system.

[0079] refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of the operating mechanism provided in the embodiment of this application. The embodiment of this application provides an internally visualized ring main unit air box. The ring main unit air box also includes an operating mechanism 500. The operating mechanism 500 is located on the outer side of the front plate 120 of the air box. The operating mechanism 500 is connected to the swing shaft sleeve 340. The operating mechanism 500 is used to control the three-position switch 300.

[0080] Based on this, by setting an operating mechanism 500 on the outer side of the front panel 120 of the air box, it is easy for staff to operate and can improve the maintenance efficiency of the staff. The operating mechanism 500 is connected to the swing sleeve 340, and the swing sleeve 340 is controlled to rotate, thereby controlling the rotation of the three-position switch 300. This allows the three-position switch 300 to be connected to the stationary contact knife 320 or the grounding contact knife 330, which can meet different working conditions and prevent misoperation. When it is necessary to inspect or maintain the equipment, it can ensure the safe conduct of maintenance work.

[0081] like Figure 12 As shown, Figure 12 This is a schematic flowchart of an optional ring main unit gas box assembly process provided in an embodiment of this application. The ring main unit gas box assembly process includes, but is not limited to, the following steps S1201 to S1210:

[0082] Step S1201: Fully weld the front plate and side plate of the air box to obtain a semi-finished air box shell.

[0083] The front and side panels of the air box are made of stainless steel, and the thickness of the front, side, and rear panels is greater than or equal to 3mm.

[0084] Based on this, by using full welding to connect the front plate and the side plate of the gas box, the rigidity of the entire ring main unit gas box can be improved. Even in complex and changeable outdoor environments, the ring main unit gas box is not easily damaged, which is conducive to improving the stability of the power system.

[0085] Step S1202: Assemble the three-position switch into the interior of the gas box housing semi-finished product.

[0086] Step S1203: Install the operating mechanism onto the front panel of the air box and connect the operating mechanism to the three-position switch.

[0087] Therefore, by installing the operating mechanism on the front panel of the air box, it is easy for staff to operate and can improve the efficiency of maintenance. By connecting the operating mechanism to the three-position switch, the rotation of the three-position switch can be controlled, so that the three-position switch can be connected to the stationary contact or the grounding contact, which can meet different working conditions and prevent misoperation, ensuring the safe conduct of maintenance work when equipment needs to be inspected or maintained.

[0088] Step S1204: Interlock multiple first reinforcing ribs and multiple second reinforcing ribs, and weld the interlocking points between the first reinforcing ribs and the second reinforcing ribs.

[0089] Step S1205: After the first reinforcing rib and the second reinforcing rib are engaged and welded, the upper wall surface of the first reinforcing rib and the upper wall surface of the second reinforcing rib are welded based on the boss hole to obtain a reinforcing rib structure. The reinforcing rib structure includes multiple first reinforcing ribs and multiple second reinforcing ribs, and the first reinforcing ribs and the second reinforcing ribs are interlocked and engaged with each other.

[0090] Step S1206: Weld the reinforcing rib structure to the outer side of the rear panel of the air box.

[0091] The order of steps S1204, S1205, and S1206 cannot be changed, otherwise the functions of the first reinforcing rib, the second reinforcing rib, and the flange will be rendered ineffective.

[0092] The height of the second reinforcing rib is equal to the sum of the height of the first reinforcing rib and the thickness of the upper wall of the second reinforcing rib. The boss hole is used as a welding connection hole after the first reinforcing rib and the second reinforcing rib mesh with each other.

[0093] It should be noted that the first and second reinforcing ribs, after being welded together, form a cross-shaped reinforcing rib structure. Multiple first and second reinforcing ribs combine to form a mesh-like reinforcing rib network. The viewing hole is located within this mesh. Generally, the distance from the top of the viewing hole to the first reinforcing rib is equal to the distance from the bottom of the viewing hole to the first reinforcing rib. Similarly, the distance from the left side of the viewing hole to the second reinforcing rib is equal to the distance from the right side of the viewing hole to the second reinforcing rib. Based on this, the pressure around the viewing hole is distributed evenly by the first and second reinforcing ribs, preventing excessive pressure in any area around the viewing hole that could lead to localized deformation of the rear panel of the air box. This improves the structural rigidity and deformation resistance of the rear panel of the air box around the viewing hole.

[0094] It should be noted that each of the first and second reinforcing ribs is welded at a welding point at regular intervals on the rear panel of the air box, so that each of the first and second reinforcing ribs can be fixed to the rear panel of the air box. At the same time, the wall thickness of each of the first and second reinforcing ribs is at least 3 mm, and the length of the first reinforcing rib is basically equal to the length of the long side of the rear panel of the air box.

[0095] Based on this, by setting multiple first reinforcing ribs and multiple second reinforcing ribs, and the first and second reinforcing ribs being able to mesh with each other, the welded connection holes after the first and second reinforcing ribs mesh with each other can be welded to improve the rigidity of the reinforcing ribs, thereby suppressing the deformation of the rear plate of the air box and preventing the gas inside the air box from easily leaking through the observation window.

[0096] Step S1207: Weld the flange to the inside of the viewing hole using a closed circumferential full welding method.

[0097] Specifically, a closed-circumferential full-weld connection is made between the inner side of the rear plate of the air box and the inner ring of the flange, and a closed-circumferential full-weld connection is made between the outer side of the rear plate of the air box and the outer ring of the flange.

[0098] Based on this, by performing a closed-circumferential full-weld connection between the inner side of the rear plate of the gas box and the inner ring of the flange, and by performing a closed-circumferential full-weld connection between the outer side of the rear plate of the gas box and the outer ring of the flange, the flatness from the rear plate of the gas box to the flange surface can be increased and the integration of the rear plate of the gas box and the flange can be increased. This makes the flange area more uniformly stressed and less prone to micropores that could cause gas leakage in the ring main unit.

[0099] Step S1208: Install the observation window into the second stud of the flange using bolts.

[0100] The observation window includes a circular groove and a sealing ring. The circular groove is located on the inner wall of the observation window, and the sealing ring is embedded in the circular groove. The sealing ring and the flange are tightly fitted together.

[0101] The height of the flange on the outer ring of the circular groove is the same as the height of the inner wall of the observation window, and the height of the flange on the inner ring of the circular groove must be at least equal to the wall thickness of the flange plus the wall thickness of the observation window.

[0102] Among its features, the device allows for a direct, level view of the three-position switch's contacts through the observation window, eliminating the need to manually locate the contacts and simplifying maintenance for staff.

[0103] Based on this, by installing the observation window into the second stud of the flange with bolts, the air tightness of the ring main unit's air box can be maintained, the flatness of the contact surface between the observation window and the flange can be preserved, deformation of the rear plate of the air box can be prevented, and the air tightness of the ring main unit's air box can be improved.

[0104] Step S1209: Install the multi-point source distributed diffuser on the inner side of the rear panel of the air box, with the center of the multi-point source distributed diffuser overlapping the center of the viewing hole.

[0105] The multi-point source distributed diffused light includes: multiple diffused lights connected in parallel; multiple explosion-proof housings located above the diffused lights, each housing including multiple light-transmitting holes distributed in a honeycomb pattern on the surface of the housing and penetrating through it; and a light frame including multiple sub-light frames, the light frame forming a clover-shaped structure based on the positional distribution of the sub-light frames, with a hollow design at the center of the light frame. Each sub-light frame includes a first light surface and a second light surface, the sub-light frame forming a flat Z-shaped structure based on the positional distribution of the first and second light surfaces, the distance from the first light surface to the center of the viewing hole being less than the distance from the second light surface to the center of the viewing hole.

[0106] The first lamp face includes multiple first mounting holes for mounting the sub-lamp holder on the inner side of the rear panel of the gas box. The second lamp face includes multiple second mounting holes and multiple third mounting holes for mounting the diffuser lamp on top of the sub-lamp holder and for mounting the explosion-proof shell on top of the sub-lamp holder.

[0107] The diffuser and the explosion-proof housing are both flat in shape, and can be flat cuboids, strips, or discs; this application does not limit the design. This design helps to reduce the space occupied by the diffuser, keeping it as far away from the three-position switch as possible, increasing the insulation distance between high and low voltage, ensuring the insulation reliability of the ring main unit enclosure, and improving heat dissipation.

[0108] In one possible implementation, the explosion-proof shell uses a material ratio of 70% nylon and 30% glass fiber.

[0109] The diffuser is fixed to the lamp holder by bolts and a second mounting hole.

[0110] The height difference between the first and second lamp surfaces is the length that the small end of the bolt can extend when the bolt is tightened. This allows the diffused light to be kept as far away from the three-position switch as possible, increasing the insulation distance from high voltage to low voltage and ensuring the insulation reliability of the ring main unit.

[0111] Since the multi-point source distributed diffused light is installed on the inner side of the rear plate of the air box based on the first stud, the number of the first mounting holes is equal to the number of the first stud.

[0112] Based on this, by installing multi-point source distributed diffused lights on the inner side of the rear panel of the gas box, the center of the multi-point source distributed diffused lights overlaps with the center of the viewing hole, realizing full-area illumination of the gas box interior environment. This ensures that the contact area of ​​the illuminated three-position switch is shadowless, making it convenient for staff to observe.

[0113] In one possible implementation, the diffuser is fixed to the lamp holder by a clip and a second mounting hole, and the height difference between the first lamp surface and the second lamp surface is the length that the clip can extend relative to the first lamp surface.

[0114] Step S1210: Install the rear plate of the gas box into the semi-finished gas box shell by full welding connection to obtain the ring main unit gas box.

[0115] The rear panel of the air box is made of stainless steel sheet with a thickness of 3mm or more.

[0116] Based on this, by installing the rear plate of the gas box into the semi-finished gas box shell with full welding, the gas box of the ring main unit can be obtained. This can maximize the airtightness of the gas box and improve the rigidity of the entire gas box. Even in complex and changeable outdoor environments, the gas box of the ring main unit is not easily damaged, which is conducive to improving the stability of the power system.

[0117] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of this application, and do not constitute a limitation on the technical solutions provided in this application. Those skilled in the art will know that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in this application are also applicable to similar technical problems.

[0118] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0119] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0120] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0121] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0122] In the embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0123] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0124] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0125] The preferred embodiments of this application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of this application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of this application shall be within the scope of the claims of this application.

Claims

1. An internally visualized ring main unit gas box, characterized in that, include: A gas box housing, the gas box housing including a gas box rear plate, the gas box rear plate including a flange, an observation window, a viewing hole and a first stud, the first stud being disposed on the inner side of the gas box rear plate and located around the viewing hole, the viewing hole penetrating the gas box rear plate, the flange being nested in the viewing hole, the center of the flange and the center of the viewing hole overlapping each other, a second stud being provided on the outer side of the flange, and the observation window being mounted on the outer side of the flange based on the second stud; A three-position switch is located inside the gas box housing, wherein the position of the viewing hole corresponds to the position of the three-position switch. A multi-point source distributed diffuser is mounted on the inner side of the rear plate of the air box based on the first stud. The center of the multi-point source distributed diffuser overlaps with the center of the viewing hole. The illumination range of the multi-point source distributed diffuser covers the three-position switch.

2. The ring main unit gas box according to claim 1, characterized in that, The rear panel of the air box also includes: Multiple first reinforcing ribs are provided horizontally on the outer side of the rear plate of the air box and located above or below the viewing hole. Each first reinforcing rib is parallel to the others. The structure of the first reinforcing rib is an arch bridge shape. Each first reinforcing rib includes multiple grooves. The grooves are provided on the upper wall surface of the first reinforcing rib. Each groove includes multiple first rectangular holes. Multiple second reinforcing ribs are vertically arranged on the outer side of the rear plate of the air box and located to the left or right of the viewing hole. The second reinforcing ribs are parallel to each other and have an arch bridge structure. Each second reinforcing rib includes multiple bosses and multiple boss holes. The positions of the boss holes correspond one-to-one with the positions of the bosses. The boss holes are located on the upper wall of the second reinforcing rib. Each boss includes multiple meshing teeth. The meshing teeth are located on the side wall of the second reinforcing rib. Each meshing tooth includes multiple second rectangular holes and multiple rectangular protrusions. Wherein, the side wall of the first reinforcing rib engages with the second rectangular hole, the rectangular protrusion engages with the first rectangular hole, the height of the second reinforcing rib is equal to the sum of the height of the first reinforcing rib and the thickness of the upper wall of the second reinforcing rib, and the protrusion hole is used as a welding connection hole after the first reinforcing rib and the second reinforcing rib engage with each other.

3. The ring main unit gas box according to claim 2, characterized in that, The rear panel of the air box also includes a plurality of third reinforcing ribs, which are horizontally disposed on the inner side of the rear panel of the air box and located above or below the viewing hole, and the third reinforcing ribs are parallel to each other.

4. The ring main unit gas box according to claim 3, characterized in that, The flange has a ring structure, a wall thickness greater than 6mm, an inner ring diameter smaller than the diameter of the viewing hole, an outer ring diameter larger than the diameter of the viewing hole, an outer ring of the flange welded to the outer side of the rear plate of the gas box in a closed circumferential full welding manner, and an inner ring of the flange welded to the inner side of the rear plate of the gas box in a closed circumferential full welding manner.

5. The ring main unit gas box according to claim 4, characterized in that, The observation window includes a circular groove and a sealing ring. The circular groove is located on the inner wall of the observation window, and the sealing ring is embedded in the circular groove. The sealing ring is in close contact with the flange.

6. The ring main unit gas box according to claim 5, characterized in that, The multi-point source distributed diffuser includes: Multiple diffusers, each of which is connected in parallel with each other; Multiple explosion-proof enclosures are provided above the diffuser lamp. Each explosion-proof enclosure includes multiple light-transmitting holes, and each light-transmitting hole is distributed in a honeycomb pattern on the surface of the explosion-proof enclosure and penetrates through the explosion-proof enclosure. A lamp holder, comprising multiple sub-lamp holders, wherein the lamp holder forms a four-leaf clover-shaped structure based on the positional distribution of the sub-lamp holders, and the center of the lamp holder is hollowed out. Each sub-lamp holder includes a first lamp surface and a second lamp surface, and the sub-lamp holder forms a flat Z-shaped structure based on the positional distribution of the first lamp surface and the second lamp surface. The distance from the first lamp surface to the center of the viewing hole is less than the distance from the second lamp surface to the center of the viewing hole. The first lamp surface includes multiple first mounting holes for mounting the sub-lamp holder on the inner side of the rear panel of the gas box. The second lamp surface includes multiple second mounting holes and multiple third mounting holes for mounting the diffuser above the sub-lamp holder. The third mounting holes are used to mount the explosion-proof shell above the sub-lamp holder.

7. The ring main unit gas box according to claim 6, characterized in that, The three-position switch includes a moving contact, a stationary contact, a grounding contact, and a swing sleeve. The moving contact is located inside the swing sleeve, and the swing sleeve is used to rotate the moving contact. The moving contact is connected to the stationary contact based on the rotation of the swing sleeve, or the moving contact is connected to the grounding contact based on the rotation of the swing sleeve.

8. The ring main unit gas box according to claim 7, characterized in that, The gas box shell also includes a gas box side plate and a gas box front plate. The gas box side plate is connected to the gas box rear plate, and the gas box front plate is connected to the gas box side plate. The connection between the gas box front plate and the gas box side plate is a full weld connection, and the connection between the gas box side plate and the gas box rear plate is a full weld connection. The gas box front plate, the gas box side plate, and the gas box rear plate are all made of stainless steel sheet, and the thickness of the gas box front plate, the gas box side plate, and the gas box rear plate is greater than or equal to 3mm.

9. The ring main unit gas box according to claim 8, characterized in that, The ring main unit air box also includes an operating mechanism, which is located on the outer side of the front plate of the air box and is connected to the swing shaft sleeve. The operating mechanism is used to control the three-position switch.

10. A ring main unit gas box assembly process, applied to the ring main unit gas box as described in claim 9, characterized in that, The assembly process of the ring main unit's air box includes: The front plate and side plate of the air box are fully welded together to obtain a semi-finished air box shell. The three-position switch is assembled into the interior of the gas box housing semi-finished product; Install the operating mechanism onto the front panel of the air box, and connect the operating mechanism to the three-position switch; Multiple first reinforcing ribs and multiple second reinforcing ribs are interlocked, and the interlocking points between the first reinforcing ribs and the second reinforcing ribs are welded. After the first reinforcing rib and the second reinforcing rib are engaged and welded, the upper wall surface of the first reinforcing rib and the upper wall surface of the second reinforcing rib are welded together based on the boss hole to obtain a reinforcing rib structure. The reinforcing rib structure includes multiple first reinforcing ribs and multiple second reinforcing ribs, and each first reinforcing rib and each second reinforcing rib are interlocked with each other. The reinforcing rib structure is welded to the outer side of the rear plate of the air box; The flange is welded to the inside of the through hole using a closed circumferential full welding method; The observation window is bolted to the second stud of the flange; A multi-point source distributed diffuser is installed on the inner side of the rear panel of the air box, and the center of the multi-point source distributed diffuser overlaps with the center of the viewing hole. The rear plate of the gas box is installed into the semi-finished gas box shell by full welding to obtain the ring main unit gas box. The process of welding the flange to the inside of the viewing hole using a closed circumferential full welding method includes the following steps: A closed-loop full circumferential welding connection is made between the inner side of the rear plate of the air box and the inner ring of the flange. A closed-loop circumferential welding connection is made between the outer side of the rear plate of the air box and the outer ring of the flange.

Images