Insulating gas box structure and ring network cabinet

Abstract

The present invention relates to the field of switch electrical control technology, and discloses an insulating gas box structure and a ring network cabinet, wherein the insulating gas box structure includes an insulating gas box, on which an incoming line module and an outgoing line module are arranged; a switch module includes a three-position switch mechanism and an auxiliary grounding switch mechanism, the three-position switch mechanism and the auxiliary grounding switch mechanism are connected through a linkage mechanism, and one end of the three-position switch mechanism is connected to the incoming line module; a fuse barrel module, one end of which is connected to the other end of the three-position switch mechanism, and the other end of the fuse barrel module is connected to the outgoing line module; the three-position switch mechanism and the fuse barrel module are arranged side by side in a lateral direction. By arranging the switch module and the fuse barrel module side by side in the insulating gas box, the height of the insulating gas box is greatly reduced, which is half the height of the gas box of the conventional European transformer ring network cabinet. At the same time, an auxiliary grounding switch is added to ensure that the incoming line end and the outgoing line end are grounded at the same time, thereby improving the safety of use.

Description

Technical Field

[0001] The invention relates to the technical field of switch electrical control, in particular to an insulating gas box structure and a ring network cabinet. Background Art

[0002] A ring main unit is an electrical device in which a group of high-voltage switchgear is installed in a metal or non-metallic insulating cabinet or made into an assembled interval ring main unit. Its core part uses load switches and fuses, and has the advantages of simple structure and small size.

[0003] Ring main unit is generally divided into three types: air insulation, solid insulation and gas insulation. The gas insulation is mainly SF6 ring main unit. Because it uses SF6 gas insulation with excellent insulation performance, the entire ring main unit is not affected by the external environment and is highly favored by users.

[0004] The core components of conventional European transformer ring main unit, load switch and fuse barrel, are usually arranged vertically along the height direction of the insulating gas box, which inevitably leads to a high height of the entire ring main unit, and most of the vertically arranged ring main units are large in size, resulting in a large footprint. For some places with requirements on site height, this structure of the ring main unit obviously cannot meet the actual requirements. With the rapid development of distributed power sources, microgrids, smart electricity consumption, and electric vehicles, the rapid growth of distribution network loads, the requirements for ring network power supply are getting higher and higher, and at the same time, the requirements for miniaturization, safety and reliability of ring main units are also getting higher and higher. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the technical problem that the load switch and the fuse tube of the conventional European transformer ring main unit in the prior art are arranged vertically along the height direction of the gas box, resulting in a high height of the entire ring main unit and being unable to meet actual needs, thereby providing a miniaturized, safe and reliable insulating gas box structure and a ring main unit having the insulating gas box structure.

[0006] To this end, one of the objects of the present invention is to provide an insulating air box structure, comprising:

[0007] An insulating gas box having an arc extinguishing chamber therein, wherein the insulating gas box is provided with an incoming line module and an outgoing line module;

[0008] A switch module, comprising a three-position switch mechanism and an auxiliary grounding switch mechanism, wherein the three-position switch mechanism and the auxiliary grounding switch mechanism are connected via a linkage mechanism, and one end of the three-position switch mechanism is connected to the incoming line module;

[0009] A fuse barrel module, one end of which is connected to the other end of the three-position switch mechanism, and the other end of which is connected to the outlet module;

[0010] Wherein, the three-position switch mechanism and the fuse barrel module are arranged side by side and spaced apart in the lateral direction.

[0011] Optionally, in the insulating gas box structure, the incoming line module includes three incoming line bushings, and the outgoing line module includes three outgoing line bushings;

[0012] The three incoming line bushings are located on a first horizontal plane, the three outgoing line bushings are located on a second horizontal plane, and the first horizontal plane is located above the second horizontal plane.

[0013] Optionally, in the insulating gas box structure, the incoming line bushing is arranged in a straight line, and its outgoing line end is connected to the three-position switch mechanism;

[0014] The outlet bushing is arranged in a straight line and is located below the fuse barrel module, and its inlet end is connected to the fuse barrel module;

[0015] An extension line of the axis of the incoming bushing is perpendicular to an extension line of the axis of the outgoing bushing.

[0016] Optionally, the insulating gas box structure and the three-position switch mechanism include:

[0017] A three-position switch is arranged in the arc extinguishing chamber, one end of which is connected to the copper bar arranged at the outlet end of the incoming line module, and the other end is connected to the incoming line end of the fuse barrel module;

[0018] A grounding contact is arranged in the arc extinguishing chamber, away from the fuse barrel module and arranged below the three-position switch;

[0019] A spring operating mechanism, arranged on the outside of the insulating gas box, connected to the three-position switch, and used to drive the three-position switch to perform closing, opening and grounding operations;

[0020] The auxiliary grounding switch mechanism comprises:

[0021] An auxiliary grounding switch is arranged in the insulating gas box and below the fuse barrel module, the auxiliary grounding switch is connected to one end of a terminal arranged at the incoming terminal of the outgoing terminal module, and the other end of the terminal is connected to the outgoing terminal of the fuse barrel module;

[0022] An auxiliary grounding switch, arranged in the insulating gas box and located below the fuse barrel module;

[0023] During the grounding operation, the three-position switch is connected to the grounding contact and the auxiliary grounding switch is connected to one end of the terminal arranged at the incoming end of the outgoing module, and the other end of the terminal is connected to the outgoing end of the fuse tube module.

[0024] Optionally, in the insulating air box structure, the linkage mechanism comprises:

[0025] A first rotating shaft connected to the spring operating mechanism, the three-position switch is arranged on the first rotating shaft, and a first crank arm is arranged on the first rotating shaft;

[0026] At least one guide groove is provided on a bracket disposed below the fuse barrel module;

[0027] A second rotating shaft, rotatably disposed on the bracket, on which a second crank arm is disposed, and the auxiliary grounding switch is disposed on the second rotating shaft;

[0028] The connecting rod mechanism comprises at least two hinged connecting rods, wherein the hinge points of the connecting rods are slidably arranged in the guide grooves, one end of the connecting rod mechanism is connected to the first crank arm, and the other end is connected to the second crank arm.

[0029] Optionally, in the insulating air box structure, the connecting rod mechanism includes three connecting rods, the guide groove includes a first guide groove and a second guide groove, and the hinge points of the three connecting rods are slidably disposed in the first guide groove and the second guide groove respectively;

[0030] The first guide groove is a linear guide groove provided on the bracket and extending vertically;

[0031] The second guide groove is a fold line guide groove partially located below the first guide groove.

[0032] Optionally, in the ring main unit, the longitudinal cross-section of the bracket is L-shaped, and the second guide groove includes:

[0033] A first oblique guide groove, which is arranged beside the first guide groove at a first angle to the extending direction of the first guide groove, and has a top not higher than the top of the first guide groove and a bottom level with the bottom of the first guide groove;

[0034] A second oblique guide groove, which is arranged below the first guide groove and forms a second angle with the extending direction of the first guide groove, wherein the second angle is greater than the first angle;

[0035] A straight guide groove is provided below the first guide groove and extends in a vertical direction, and an extension line of the straight guide groove is parallel to an extension line of the first guide groove.

[0036] Optionally, in the insulating air box structure, the axis of the first rotating shaft is perpendicular to the axis of the second rotating shaft.

[0037] Optionally, in the ring main unit, the fuse barrel module comprises:

[0038] Three fuse barrels, each of which partially extends outside the insulating gas box and the lines connecting the centers of the longitudinal cross-sections of the three fuse barrels form an equilateral triangle;

[0039] Any of the fuse tubes is provided with a fuse inside.

[0040] A second object of the present invention is to provide a ring main unit, comprising:

[0041] An air box, wherein the air box is the insulating air box structure described in any one of the above items;

[0042] A transformer module, the transformer module comprising a transformer housing and a transformer disposed in the transformer housing;

[0043] The gas box is overlapped on the transformer housing and the outlet terminal of the outlet module is connected to the high voltage terminal of the transformer.

[0044] The technical solution of the present invention has the following advantages:

[0045] 1. The insulating gas box structure of the present invention greatly reduces the height of the insulating gas box by arranging the switch module and the fuse barrel module side by side in the insulating gas box horizontally, which is half the height of the gas box of the conventional European transformer ring main unit. At the same time, an auxiliary grounding switch is added to ensure that the incoming and outgoing terminals are grounded at the same time, thereby improving the safety of use.

[0046] 2. In the insulating gas box structure of the present invention, the second guide groove is partially located below the first guide groove, and is partially arranged side by side with the first guide groove. Compared with the existing structural design in which the second guide groove is entirely located below the first guide groove, such an arrangement can further reduce the vertical distance between the auxiliary grounding switch mechanism and the three-position switch mechanism, thereby further reducing the height of the insulating gas box.

[0047] 3. In the insulating gas box structure of the present invention, the lines connecting the centers of the longitudinal sections of the three fuse tubes form an equilateral triangle. Compared with the three fuse tubes in the conventional European transformer ring main unit arranged vertically or vertically inclined, the arrangement of the fuse tube module can not only improve the aesthetic effect, but also further effectively reduce the space occupied by the fuse tube module in the vertical direction, thereby further reducing the height of the insulating gas box 1.

[0048] 4. The ring main unit of the present invention adopts the above-mentioned insulating gas box structure, so the height is greatly reduced, which meets the miniaturization requirements and improves the applicability of the ring main unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 It is a schematic diagram of the main structure of the ring main unit in an embodiment of the present invention;

[0051] Figure 2 is a schematic diagram of a top view of an insulating air box structure in an embodiment of the present invention;

[0052] Figure 3 It is a schematic diagram of the side structure of the insulating gas box structure in the embodiment of the present invention, omitting the insulating gas box;

[0053] Figure 4 It is a rear view structural schematic diagram of the insulating gas box structure in the embodiment of the present invention, omitting the insulating gas box;

[0054] Figure 5 It is a schematic diagram of the main structure of the switch module of the insulating gas box structure in the embodiment of the present invention;

[0055] Figure 6 It is a side structural schematic diagram of a switch module of an insulating gas box structure in an embodiment of the present invention;

[0056] Figure 7 It is a side structural schematic diagram of the distribution of guide grooves in the bracket of the insulating air box structure in the embodiment of the present invention.

[0057] Description of reference numerals:

[0058] 1-insulating gas box; 11-incoming module; 12-outgoing module;

[0059] 2-switch module; 21-three-position switch mechanism; 211-three-position switch; 212-grounding contact; 213-spring operating mechanism; 22-auxiliary grounding switch mechanism; 221-auxiliary grounding switch; 23-linkage mechanism; 231-first rotating shaft; 232-first crank arm; 233-connecting rod mechanism; 2331-first connecting rod; 2332-second connecting rod; 2333-third connecting rod; 234-guide groove; 2341-first guide groove; 2342-second guide groove; 23421-first oblique guide groove; 23422-second oblique guide groove; 23423-straight guide groove; 24-bracket;

[0060] 3-fuse tube module; 30-fuse tube;

[0061] 4-transformer module; 41-transformer; 42-high voltage end;

[0062] 5-Copper busbar;

[0063] 6- Binding post;

[0064] 7-copper rod; 7a-incoming copper rod; 7b-outgoing copper rod. DETAILED DESCRIPTION

[0065] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] Example 1

[0067] See also Figures 1 to 7 , an insulating gas box structure provided in this embodiment includes an insulating gas box 1, a switch module 2 and a fuse barrel module 3. The insulating gas box 1 has an arc extinguishing chamber, and an incoming line module 11 and an outgoing line module 12 are provided on the insulating gas box 1. The switch module 2 includes a three-position switch mechanism 21 and an auxiliary grounding switch mechanism 22. The three-position switch mechanism 21 and the auxiliary grounding switch mechanism 22 are connected by a linkage mechanism 23, and one end of the three-position switch mechanism 21 is connected to the incoming line module 11. One end of the fuse barrel module 3 is connected to the other end of the three-position switch mechanism 21, and the other end of the fuse barrel module 3 is connected to the outgoing line module 12, thereby forming a circuit loop. The three-position switch mechanism 21 and the fuse barrel module 3 are arranged side by side in the lateral direction. It should be noted that the three-position switch mechanism 21 and the fuse barrel module 3 are arranged in parallel along the length direction of the insulating gas box 1, that is, as shown in FIG. Figure 2 As shown, they are arranged side by side in the horizontal direction with intervals. The length of the insulating gas box 1 in this embodiment is three-fifths of the length of the gas box of the existing conventional European-type ring main unit. Since the fuse tube located below the load switch of the existing conventional European-type ring main unit is set to a horizontal position at the same level as the load switch, the height of the gas box is greatly reduced. The height of the gas box in this embodiment is only half of the height of the gas box of the existing conventional European-type ring main unit.

[0068] Specifically, for the incoming line module 11 and the outgoing line module 12, the incoming line module 11 includes three incoming line bushings, and the outgoing line module 12 includes three outgoing line bushings. The three incoming line bushings are in the same horizontal plane, which is described as the first horizontal plane for the convenience of description and distinction. The three outgoing line bushings are in the same horizontal plane, which is described as the second horizontal plane for the convenience of description and distinction. The first horizontal plane is located above the second horizontal plane, that is, the present embodiment adopts the top-in and bottom-out method. More specifically, the incoming line module 11 and the outgoing line module 12 are arranged on the opposite side surfaces of the insulating gas box 1, such as Figure 2 The incoming line module 11 is arranged on the left side of the insulating gas box 1, and the outgoing line module 12 is arranged on the rear side of the insulating gas box 1. That is, the incoming line bushing and the outgoing line bushing are arranged in a straight line, and the extended line of the axis of the incoming line bushing and the extended line of the axis of the outgoing line bushing are arranged vertically.

[0069] For the three-position switch mechanism 21, Figures 3 to 7 As shown, it includes a three-position switch 211, a grounding contact 212 and a spring operating mechanism 213. The auxiliary grounding switch mechanism 22 includes an auxiliary grounding switch 221. The copper busbar 5 is arranged at the outlet end of the incoming line module 11, one end of the three-position switch 211 is connected to the copper busbar 5, and the other end is connected to the incoming line end of the fuse barrel module 3. The grounding contact 212 is arranged on an insulating mounting frame in the arc extinguishing chamber, and is arranged below the three-position switch 211 away from the fuse barrel module 3. The spring operating mechanism 213 is an existing conventional spring operating mechanism, and the specific structure and working principle of the spring operating mechanism 213 are not described in detail and limited here. The spring operating mechanism 213 is connected to the three-position switch 211 through a connecting mechanism such as a conventional mechanical interlock, and the specific structure and working principle of the mechanical interlock are not described in detail and limited here. The spring operating mechanism 213 can be used to drive the three-position switch 211 to rotate downward to connect with the grounding contact 212 to realize the grounding operation, rotate upward to connect with the three-position switch static contact (not shown) connected to the copper bar 5 at the upper end of the arc extinguishing chamber to perform the closing operation, and rotate to between the grounding contact 212 and the three-position switch static contact to realize the opening operation. It should be noted that the three-position switch 211 in this embodiment is connected along the width direction of the insulating gas box 1, that is, as shown in FIG. Figure 2 As shown in the vertical arrangement. For the auxiliary grounding switch mechanism 22, as Figures 3 to 7 As shown, it includes an auxiliary grounding switch 221, and a terminal 6 is arranged at the incoming end of the outgoing module 12, and one end is connected to the outgoing end of the fuse barrel module 3. During the grounding operation, the spring operating mechanism 213 drives the three-position switch to connect with the grounding contact, and at the same time, the three-position switch 211 drives the auxiliary grounding switch 221 to connect with the terminal 6 at the incoming end of the outgoing module 12 through the linkage mechanism, thereby realizing bilateral grounding of the incoming end and the outgoing end, further improving the safety performance of the grounding of the insulating gas box 1. For the linkage mechanism, Figures 5 to 7As shown, the linkage mechanism includes a first rotating shaft 231, a guide groove 234, a second rotating shaft 235 and a connecting rod mechanism 233, wherein the first rotating shaft 231 is provided with a three-position switch 211 and a first crank arm 232, the second rotating shaft 235 is provided with an auxiliary grounding switch 221 and a second crank arm 236, the first crank arm 232 and the second crank arm 236 are respectively connected to the two ends of the connecting rod mechanism 233, and the connecting rod mechanism 233 includes three hinged connecting rods. For the convenience of distinction and description, the connecting rod connected to the first crank arm 232 is expressed as a first connecting rod 2331, the connecting rod connected to the second crank arm 236 is expressed as a third connecting rod 2333, and the third connecting rod 2334 is expressed as a third connecting rod 2335. The connecting rod between the first connecting rod 2331 and the third connecting rod 2333 is expressed as the second connecting rod 2332. One end of the first connecting rod 2331 and the second connecting rod 2332 is hinged, and the other end of the second connecting rod 2332 is hinged to the third connecting rod 2333. The hinge points of the first connecting rod 2331 and the second connecting rod 2332 and the hinge points of the second connecting rod 2332 and the third connecting rod 2333 are slidably arranged in the first guide groove 2341 and the second guide groove 2342 respectively. The first guide groove 2341 and the second guide groove 2342 are provided on the bracket 24 arranged inside the insulating gas box 1 and below the fuse tube module 3, and the longitudinal section of the bracket 24 is L-shaped. Specifically, for the first guide groove 2341, it is a straight line guide groove arranged along the vertical direction. For the second guide groove 2342, it is a broken line guide groove at least partially located below the first guide groove 2341. More specifically, as Figure 7 As shown, the second guide groove 2342 includes three sections, which are the first oblique guide groove 23421, the second oblique guide groove 23422 and the straight guide groove 23423 from top to bottom. The top of the first oblique guide groove 23421 is not higher than the top of the first guide groove 2341 and the bottom of the first oblique guide groove 23421 is flush with the bottom of the first guide groove 2341. For example, the top of the first oblique guide groove 23421 is located in the middle of the first guide groove 2341, and the extension direction of the first oblique guide groove 23421 and the first guide groove 2341 is in the first direction. The second oblique guide groove 23422 is located at the bottom end of the first guide groove 2341, and is arranged at a second angle with the extension direction of the first guide groove 2341, and the second angle is greater than the first angle. The straight guide groove 23423 is arranged at the bottom end of the first guide groove 2341 and extends in the vertical direction, that is, the extension line of the first guide groove 2341 is parallel to the extension line of the straight guide groove 23423 but not colinear. Specifically, the straight guide groove 23423 is located on the side of the first guide groove 2341 away from the first oblique guide groove 23421, that is, Figure 7The straight guide groove 23423 shown is located at the lower right of the first guide groove 2341. More specifically, a circular mounting hole is formed at the top of each of the first guide groove 2341 and the second guide groove 2342, and the diameter of the mounting hole is greater than the width of the corresponding guide groove. In this way, since the second guide groove 2342 and the first guide groove 2341 are partially arranged side by side, compared with the existing structural design in which the second guide groove 2342 is completely located below the first guide groove 2341, the design of the guide groove 234 of this embodiment can further reduce the distance between the auxiliary grounding switch mechanism 22 and the three-position switch mechanism 21 in the vertical direction, thereby further reducing the height of the insulating gas box 1. It should be noted that the axis of the first rotating shaft 231 is perpendicular to the axis of the second rotating shaft 235. As an alternative embodiment, the connecting rod mechanism 233 can include only two connecting rods or four, etc., and correspondingly, the guide groove 234 can include only one guide groove or three, etc.

[0070] The fuse tube module 3 includes three fuse tubes 30, each of which is provided with a fuse. The specific structure of the fuse tube 30 is not described or limited in detail here, and it is a conventional straight-line fuse tube. The incoming end of the fuse tube 30 is connected to the three-position switch 211 through the incoming copper rod 7a, and the outgoing end of the fuse tube 30 is connected to the terminal 6 arranged at the incoming end of the outgoing module 12 through the outgoing copper rod 7b, so that the incoming module 11, the three-position switch 211, the fuse tube module 3 and the outgoing module 12 form a loop. The three fuse tubes 30 all partially extend out of the outside of the insulating gas box 1, and are arranged on the same side of the insulating gas box 1 as the spring operating mechanism 213, that is, Figure 2 The lower end surface of the insulating gas box shown in FIG. 1 is provided with the outlet module 12 on the opposite side of the spring operating mechanism 213 and the fuse barrel module 3, that is, Figure 2 The upper end surface of the insulating gas box 1 is shown. The longitudinal cross-sections of the three fuse barrels 30 are all circular, and the centers of the longitudinal cross-sections of the three fuse barrels 30 are not collinear. Preferably, the lines connecting the centers of the longitudinal cross-sections of the three fuse barrels 30 form an equilateral triangle. Compared with the three fuse barrels 30 in the conventional European transformer ring network cabinet arranged vertically or three fuse barrels 30 arranged vertically and tilted, the arrangement of the fuse barrel module 3 can not only improve the aesthetic effect, but also further effectively reduce the space occupied by the fuse barrel module 3 in the vertical direction, thereby further reducing the height of the insulating gas box 1.

[0071] Example 2

[0072] This embodiment provides a ring main unit, see Figures 1 to 7, including the gas box and transformer module 4 in the above embodiment 1, the gas box is overlapped above the transformer module 4. Specifically, the transformer module 4 includes a transformer housing and a transformer 41 arranged at the bottom end of the transformer housing, a high-voltage terminal 42 is provided at the upper end of the transformer housing, and the outlet module 12 is connected to the high-voltage terminal 42 through a pluggable cable accessory. The specific structure of the transformer module 4 is not described and limited in detail herein.

[0073] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An insulating gas box structure, characterized in that: include: An insulating gas box (1) having an arc extinguishing chamber therein, wherein the insulating gas box (1) is provided with an incoming line module (11) and an outgoing line module (12); A switch module (2), comprising a three-position switch mechanism (21) and an auxiliary grounding switch mechanism (22), wherein the three-position switch mechanism (21) and the auxiliary grounding switch mechanism (22) are connected via a linkage mechanism (23), and one end of the three-position switch mechanism (21) is connected to the incoming line module (11); A fuse barrel module (3), one end of the fuse barrel module (3) being connected to the other end of the three-position switch mechanism (21), and the other end of the fuse barrel module (3) being connected to the outlet module (12); Wherein, the three-position switch mechanism (21) and the fuse barrel module (3) are arranged side by side and spaced apart in the transverse direction; The three-position switch mechanism (21) comprises: A three-position switch (211) is arranged in the arc extinguishing chamber, one end of which is connected to a copper busbar (5) arranged at the outlet end of the incoming line module (11), and the other end of which is connected to the incoming line end of the fuse barrel module (3); A grounding contact (212) is arranged in the arc extinguishing chamber, away from the fuse barrel module (3) and below the three-position switch (211); A spring operating mechanism (213) is arranged outside the insulating gas box (1), connected to the three-position switch (211), and used for driving the three-position switch (211) to perform closing, opening and grounding operations; The auxiliary grounding switch mechanism (22) comprises: An auxiliary grounding switch (221) is arranged in the insulating gas box (1) and is located below the fuse barrel module (3); During the grounding operation, the three-position switch (211) and the grounding contact (212) are connected and the auxiliary grounding switch (221) is connected to one end of a terminal (6) provided at the incoming line end of the outgoing line module (12), and the other end of the terminal (6) is connected to the outgoing line end of the fuse barrel module (3); The linkage mechanism (23) comprises: a first rotating shaft (231) connected to the spring operating mechanism (213); the three-position switch (211) is arranged on the first rotating shaft (231); and a first crank arm (232) is arranged on the first rotating shaft (231); At least one guide groove (234) is provided on a bracket (24) disposed below the fuse barrel module (3); A second rotating shaft (235) is rotatably disposed on the bracket (24), and a second crank arm (236) is disposed on the second rotating shaft (235); the auxiliary grounding switch (221) is disposed on the second rotating shaft (235); The connecting rod mechanism (233) comprises at least two hinged connecting rods, wherein the hinge points of the connecting rods are slidably arranged in the guide grooves (234), and one end of the connecting rod mechanism (233) is connected to the first crank arm (232), and the other end is connected to the second crank arm (236).

2. An insulating air box structure according to claim 1, characterized in that: The incoming line module (11) comprises three incoming line bushings, and the outgoing line module (12) comprises three outgoing line bushings; The three incoming line bushings are located on a first horizontal plane, the three outgoing line bushings are located on a second horizontal plane, and the first horizontal plane is located above the second horizontal plane.

3. An insulating air box structure according to claim 2, characterized in that: The incoming line bushing is arranged in a straight line, and its outgoing line end is connected to the three-position switch mechanism (21); The outlet bushing is arranged in a straight line and is located below the fuse barrel module (3), and its inlet end is connected to the fuse barrel module (3); An extension line of the axis of the incoming bushing is perpendicular to an extension line of the axis of the outgoing bushing.

4. The insulating air box structure according to claim 1, characterized in that: The connecting rod mechanism (233) includes three connecting rods, the guide groove (234) includes a first guide groove (2341) and a second guide groove (2342), and the hinge points of the three connecting rods are slidably disposed in the first guide groove (2341) and the second guide groove (2342) respectively; The first guide groove (2341) is a linear guide groove provided on the bracket (24) and extending in the vertical direction; The second guide groove (2342) is a fold line guide groove partially located below the first guide groove (2341).

5. An insulating air box structure according to claim 4, characterized in that: The longitudinal cross section of the bracket (24) is L-shaped, and the second guide groove (2342) comprises: A first oblique guide groove (23421) is provided beside the first guide groove (2341) at a first angle with the extension direction of the first guide groove (2341), and its top end is not higher than the top end of the first guide groove (2341) and its bottom end is flush with the bottom end of the first guide groove (2341); A second oblique guide groove (23422) is arranged below the first guide groove (2341) at a second angle with the extension direction of the first guide groove (2341), wherein the second angle is greater than the first angle; The straight guide groove (23423) extends in the vertical direction and is arranged below the first guide groove (2341), and the extension line of the straight guide groove (23423) is parallel to the extension line of the first guide groove (2341).

6. The insulating air box structure according to claim 1, characterized in that: The axis of the first rotating shaft (231) and the axis of the second rotating shaft (235) are perpendicular.

7. An insulating air box structure according to any one of claims 1 to 6, characterized in that: The fuse barrel module (3) comprises: Three fuse barrels (30), each of the three fuse barrels (30) partially extending outside the insulating gas box (1) and a line connecting the centers of the longitudinal cross-sections of the three fuse barrels (30) forming an equilateral triangle; Any of the fuse tubes (30) is provided with a fuse inside.

8. A ring main unit, characterized in that: include: An air box, wherein the air box is the air box structure according to any one of claims 1 to 7; A transformer module (4), the transformer module (4) comprising a transformer housing and a transformer (41) arranged in the transformer housing; The gas box is overlapped on the transformer housing and the outlet end of the outlet module (12) is connected to the high voltage end (42) of the transformer (41).

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