CN210985218U - Air insulation sealing switch cabinet with side expansion device - Google Patents

Abstract

An air-insulated and sealed switch cabinet with side expansion device includes a first cabinet body and a second cabinet body, the first and second cabinet bodies are both provided with opening windows for expansion, and the first cabinet body and the second cabinet body are provided with opening windows for expansion. An insulating partition is provided between two adjacent copper bars; the copper bars of the first cabinet or the second cabinet are provided with parallel cabinet extension contact claws for overlapping copper bars, and the first cabinet or the second cabinet Each positioning reinforcing slat of the cabinet is provided with an annular seal; both the first and second cabinets are provided with connecting plates, and each positioning reinforcing slat of the combined first and second cabinets is respectively connected to the annular seal abut against each other and form a seal. The utility model has the advantages of low cost, good sealing, low requirements on the installation environment and the position of the parallel interface, and adopts a large window type, combined with a high-insulation performance phase partition plate and an adaptable parallel cabinet expansion contact claw structure, which greatly improves the switching performance. Cabinet-side expansion and cabinet integration accuracy, flexibility and reliability.

Description

An air-insulated and sealed switchgear with side expansion device

technical field

The invention relates to an air-insulated and sealed switch cabinet with a side expansion device.

Background technique

The side expansion mode or device of the existing medium voltage switchgear usually adopts the side expansion bushing busbar type, the side expansion epoxy resin casting busbar type, the silicone inner cone busbar connection bushing type (connector), and most of them are expensive. , the installation environment and the location of the parallel interface are relatively high; it is difficult to observe the quality of the busbar at the expansion parallel connection during the installation process of the expansion parallel connection.

Chinese Patent Document No. CN202127175U discloses a side expansion device for a high-voltage switchgear on 2012.01.25, including an insulating sleeve, a plum-blossom contact, two grounding sleeves, two contact boxes, and two connectors, and the two contact boxes are respectively sleeved On the outer sides of the two ends of the insulating sleeve, two grounding sleeves are respectively inserted into the openings at both ends of the insulating sleeve, the plum blossom contacts are inserted into the insulating sleeves, and the two ends of the plum blossom contacts are respectively located in the two grounding sleeves, and the two connectors are respectively connected from the plum blossom. The openings at both ends of the contacts are inserted into the plum-blossom contacts. This structure has the above-mentioned shortcomings, so it needs to be further improved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a kind of accurate guide combination, flexible and quick operation, good sealing, which can improve the accuracy, flexibility and reliability of the expansion and combination of switch cabinets, and can meet the electrical performance standards such as resistance between the combined cabinets. Air-insulated and sealed switchgear with side expansion devices to overcome the deficiencies in the prior art.

The first air-insulated and sealed switchgear with side expansion device designed for this purpose includes a first cabinet body and a second cabinet body, the first and second cabinet bodies are both provided with opening windows for expansion, and the two More than one copper bar is arranged in the opening window, and insulating partitions are arranged between the adjacent two copper bars of the first cabinet body and the second cabinet body; The row is provided with parallel cabinet extension contact claws for overlapping copper bars, and a ring seal is provided on each positioning reinforcing slat of the first cabinet or the second cabinet; the tops of the first and second cabinets are provided with There are connecting plates, the first and second cabinets are merged through the connecting plates, and the connecting plates between the first and second cabinets are provided with guides, so that the openings of the combined first and second cabinets are The windows correspond to each other, and the copper bars of the combined first and second cabinets are respectively overlapped with the extended contact claws of the combined cabinets; in addition, each positioning reinforcement strip of the combined first and second cabinets is respectively It is in contact with the annular seal and forms a seal. The four perimeters of the opening window are firmly glued with high-viscosity glue, and fixed on the four peripheries of the opening window with countersunk screws. Synthesize a ring to seal the expanded opening; paste a square waterproof sealing ring (ring seal) with strong adhesiveness on the positioning reinforcing slat on one of the cabinets, which can ensure that the first cabinet and the second cabinet are merged. , the junction between the first cabinet and the second cabinet forms a seal to prevent dust, dirt, condensation and water droplets from entering the sealed chambers of the first cabinet and the second cabinet.

The opening windows of the first and second cabinets are provided with support pieces for supporting the copper bars, and the positioning reinforcing slats are connected with the support pieces; slot; wherein, the copper bar of the first cabinet is located in the slot, and the copper bar of the first cabinet is overlapped with the expansion contact claws of the cabinet, and a rectangular slot is arranged in the middle of the support for the copper bar The positioning support can prevent the copper bar from shifting under the action of electric power; the expansion contact claws of the cabinet include the upper contact claws and the lower contact claws, and the tails of the upper and lower contact claws are respectively connected with the first cabinet. The copper bars are connected, and a rotating piece is arranged between the upper and lower contact claws. The rotating piece is inserted into the upper and lower contact claws from top to bottom. The rotating piece is partially exposed on the top of the upper contact claws. The rotating part sleeve is provided with a compression spring which provides the lapped pressing force of the expansion contact claw of the cabinet and the copper bar.

The upper and lower contact claws are respectively provided with through holes, and the rotating parts and the through holes are clearance fit, so that the upper and lower contact claws move up and down along the rotating parts and rotate, and are installed and limited by the tails of the upper and lower contact claws ;The tails of the upper and lower contact claws are respectively provided with mounting holes for inserting the connecting pieces, and the connecting pieces and the mounting holes are matched with clearance to ensure that the tails of the upper and lower contact claws have a certain amount of floating in the up-down and front-rear directions, so as to achieve parallel The cabinet extension contact claw automatically adapts to the floating position error in the vertical and frontal directions, and the connection is reliable to ensure the electrical performance requirements such as the resistance between the cabinets between the first cabinet and the second cabinet after the merger. The hole, the connecting piece and the connecting hole are in an interference fit, and the connecting hole of the copper bar is tightly fitted with the connecting piece to ensure a firm and reliable connection; among which, the connecting piece is inserted into the tail of the upper contact claw, the copper bar and the lower contact from top to bottom The tail of the head claw.

The connecting piece is an elastic pin.

There is an engagement position between the upper and lower contact claws, and each copper bar of the first and second cabinets is respectively provided with an expansion end, and the expansion end is provided with a clamping slot that matches the engagement position, and the clamping slot is clamped. (Elastic occlusion and connection) At the occlusal position, the copper bars overlap with the claws of the expansion contacts of the cabinet through the occlusal position, the clamping slot, and the extended end is provided with a guiding slope. The top surface and the front end of the bottom surface of the extended end of the copper bar are provided with guiding slopes (that is, the double-sided slope pre-guide structure is adopted), and a semi-circular clamping groove is opened, which is convenient for the copper bar to engage with the expansion contact claws of the cabinet. Lap positioning is accurate.

The support is at least a leaf spring type bending piece, and the shape of the support piece is designed as a leaf spring type bending piece, which can realize elastic deformation and displacement in the vertical and horizontal directions, and automatically adapt to the floating position error of the copper bars in the up, down, left and right directions; Several sheds, each shed is set up and down at intervals to ensure that the insulation creeping distance meets the standard requirements; the positioning reinforcing slats are provided with installation grooves corresponding to the support, and one end of the support is embedded in the installation groove.

The copper bars include the parallel expansion L1/L3 phase left copper row, the parallel expansion L2 phase left copper row arranged in the first cabinet, and the parallel expansion L1/L3 phase right copper row and the parallel expansion copper row arranged in the second cabinet. The right copper bar of L2 phase; the left and right copper bars of L1/L3 phase in parallel cabinets are folded inward to lead out the extension connection end, which can ensure sufficient insulation distance between the copper bar and the edge of the opening window; the left and right copper bars of L2 phase of parallel cabinet expansion The extension connection end is led out by the straight copper bar structure.

The connecting plate is at least an L-shaped locking plate, and the side of the L-shaped locking plate is provided with a conical guide pin and a matching hole. The top connecting plates of the first and second cabinets are provided with guide pins and matching holes; so that the first and second cabinets have a two-way guiding and positioning structure when they are combined, and the guiding is accurate and flexible; the middle of the side of the L-shaped locking plate is provided There are two matching holes, which are used for the locking connection between the cabinets after the first and second cabinets are combined, to ensure that the position of the lap joint between the extended contact claw and the copper bar of the combined cabinet is accurate and meets the qualified requirements. The connecting plate is fixed on the first cabinet body or the second cabinet body through screws.

The first and second cabinets are respectively provided with rear side panels, and the opening windows of the first and second cabinets are respectively arranged on the rear side panels; a reinforcing connecting plate is provided under the opening windows of the first cabinet or the second cabinet. After merging, the first and second cabinets clamp the reinforcing connecting plate and are fixed by fasteners, and the fasteners penetrate the first cabinet, the reinforcing connecting plate and the second cabinet. The rear side panels of the first and second cabinets are provided with large oval or square-rectangular opening windows to ensure sufficient relative ground and phase-to-phase insulation distances for the three-phase copper bars; There are two small connecting holes for installing the reinforced connecting plate on the rear side plate of the first cabinet or the second cabinet, and a large hole is arranged in the middle of the reinforced connecting plate for connecting the rear side of the first cabinet through plate, strengthening connection plate and the rear side plate of the second cabinet to ensure that the position of the lap joint between the expansion contact claw of the parallel cabinet and the copper bar is accurate and meets the qualification requirements.

The insulating partition includes a vertical partition arranged in the first cabinet, and a bent partition arranged in the second cabinet, and the bent partition is provided with an opening; after the combination, one end of the vertical partition and the bent partition are The openings of the partitions are butt-jointed to form a closed phase-to-phase shield at the overlapping position of the copper bar and the extended contact claws of the combined cabinet, to ensure that the insulation distance between the copper bars of the first cabinet and the second cabinet is sufficient after the combination. .

The air-insulated and sealed switchgear is at least a medium-voltage air-insulated and sealed switchgear; the bent partition includes two bent parts, and the two bent parts are connected and combined into an open bent partition.

The beneficial effects of the present invention are as follows:

a. High reliability, adopting the self-adaptive expansion contact claw structure of the cabinet, and the parallel port can form a seal at the same time after the expansion of the cabinet, and the interface is stable and reliable, ensuring the reliable operation of the switchgear;

b. The expansion cabinets have high precision and accurate orientation. The expansion copper bars and the contact claws are occluded and positioned accurately, meeting other electrical performance standard requirements such as resistance between cabinets and cabinets, and improving product quality;

c. Flexible and fast cabinet integration, and the installation labor intensity is not high, which greatly improves the production efficiency;

d. Good versatility, this device can meet the installation requirements of various types and specifications of expanded copper bars by installing leaf spring-type insulating supports with slots of different specifications, thereby adapting to the requirements of expanding and merging cabinets of various series of cabinets and reducing costs.

In general, the cabinet merger and guidance of the expansion device on the side of the air-insulated sealed switchgear is accurate, flexible and fast, and the cabinet is sealed at the same time after the cabinet is combined, so the cost is low, and it is suitable for the expansion and merger of the construction site and the factory. This side expansion device can be installed with leaf spring-type insulating supports with different specifications of slots to meet the installation requirements of various types and specifications of expansion copper bars. The expansion device on the side of the air-insulated sealed switchgear adopts the self-adaptive expansion contact claw structure. The parallel connection is reliable and can meet the electrical performance standard requirements such as the resistance between the parallel cabinets. This medium-voltage air-insulated and sealed switchgear side expansion device is the first to use a large window type, combined with high-insulation performance phase partitions and an adaptive expansion contact claw structure, which greatly improves the accuracy of expansion and combination of switchgear. Flexibility and reliability.

Description of drawings

FIG. 1 is a schematic three-dimensional structural diagram of the first and second cabinets before merging according to an embodiment of the present invention.

FIG. 2 is a schematic three-dimensional structural diagram of a first cabinet according to an embodiment of the present invention.

FIG. 3 is a schematic three-dimensional partial structure diagram of a first cabinet according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a connection structure between a support member and a positioning reinforcing slat according to an embodiment of the present invention.

FIG. 5 is a rear view of the first cabinet according to an embodiment of the present invention.

FIG. 6 is a schematic three-dimensional structural diagram of a second cabinet according to an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of an extension end of a copper bar according to an embodiment of the present invention.

8 is a schematic structural diagram of an embodiment of the present invention before the first and second cabinets are combined.

FIG. 9 is a schematic view of the cross-sectional structure of A-A in FIG. 8 .

FIG. 10 is a schematic structural diagram of the combined first and second cabinets according to an embodiment of the present invention.

FIG. 11 is a schematic diagram of another orientation structure (top view position) after the first and second cabinets are combined according to an embodiment of the present invention.

In the figure, 1 is the first cabinet, 2 is the second cabinet, 3 is the opening window, 4 is the extension contact claw of the cabinet, 4.1 is the upper contact claw, 4.2 is the lower contact claw, and 4.3 is the occlusal position. 5 is the positioning reinforcing slat, 5.1 is the installation groove, 6 is the annular seal, 7 is the connecting plate, 8 is the guide, 9 is the vertical partition, 10 is the rear side plate, 11 is the support, 11.1 is the card slot , 11.2 is the umbrella skirt, 12 is the rotating piece, 13 is the compression spring, 14 is the extension end, 14.1 is the clamping slot, 14.2 is the guiding slope, 15 is the connecting piece, 16 is the left copper bar of the L1/L3 phase of the parallel cabinet expansion, 17 Extend the left copper bar of L2 phase in parallel cabinets, 18 is the right copper bar of L1/L3 phase in parallel cabinets, 19 is the right copper bar of L2 phase extended in parallel cabinets, 20 is the reinforcing connection plate, 21 is the bent partition, 21.1 is the opening .

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Referring to Figures 1-2, an air-insulated and sealed switchgear with side expansion device includes a first cabinet 1 and a second cabinet 2. The first and second cabinets 1 and 2 are both provided with opening windows for expansion. 3. More than one copper bar is arranged in the opening window 3 of the two, and an insulating partition is arranged between the adjacent two copper bars of the first cabinet 1 and the second cabinet 2; The copper bars of the cabinet 1 or the second cabinet 2 are provided with parallel cabinet extension contact claws 4 for overlapping the copper bars, and each positioning reinforcing strip 5 of the first cabinet 1 or the second cabinet 2 is provided with There are annular seals 6; the tops of the first and second cabinets 1 and 2 are provided with connecting plates 7, and the first and second cabinets 1 and 2 are combined by the connecting plates 7, and the first and second cabinets 1 The connecting plates 7 between the two cabinets 1 and 2 are provided with guides 8, so that the opening windows 3 of the combined first and second cabinets 1 and 2 correspond to each other, and the combined first and second cabinets 1, 2 and 2 correspond to each other. The copper bars of form a seal.

The opening windows 3 of the first and second cabinets 1 and 2 are provided with support members 11 for supporting the copper bars, and the positioning reinforcement strips 5 are connected to the support members 11; the support members of the first and second cabinet bodies 1 and 2 11 are provided with card slots 11.1 for positioning and supporting copper bars; wherein, the copper bars of the first cabinet 1 are located in the card slots 11.1, and the copper bars of the first cabinet 1 are overlapped with the cabinet extension contact claws 4; The extended contact claws 4 of the parallel cabinets include upper contact claws 4.1 and lower contact claws 4.2. The tails of the upper and lower contact claws 4.1 and 4.2 are respectively connected to the copper bars of the first cabinet 1. The upper and lower contact claws 4.1 There is a rotating member 12 between 4.2 and 4.2. The rotating member 12 is inserted into the upper and lower contact claws 4.1 and 4.2 from top to bottom. The rotating member 12 is partially exposed on the top of the upper contact claw 4.1. The rotating member 12 is sleeved with a compression spring 13 which provides a pressing force for overlapping the expansion contact claw 4 of the cabinet and the copper bar.

The upper and lower contact claws 4.1, 4.2 are respectively provided with through holes, and the rotating member 12 is clearance fit with the through holes, so that the upper and lower contact claws 4.1, 4.2 move up and down along the rotating member 12 and rotate, and pass the upper and lower contacts. The tails of the head claws 4.1 and 4.2 are installed and limited; the tails of the upper and lower contact claws 4.1 and 4.2 are respectively provided with mounting holes for inserting the connecting piece 15. The connecting piece 15 and the mounting hole are clearance fit, and the copper bar corresponds to the connecting piece 15. A connecting hole is provided, and the connecting piece 15 is in an interference fit with the connecting hole; wherein, the connecting piece 15 is inserted into the tail of the upper contact claw 4.1, the copper bar and the tail of the lower contact claw 4.2 from top to bottom.

An engagement position 4.3 is provided between the upper and lower contact claws 4.1 and 4.2. Each copper bar of the first and second cabinets 1 and 2 is respectively provided with an expansion end 14, and the expansion end 14 is provided with an engagement position 4.3. Matching snap slot 14.1, snap slot 14.1 is snapped on the engagement position 4.3, the copper bar overlaps with the expansion contact claw 4 of the cabinet through the engagement position 4.3, snap slot 14.1, and the extension end 14 is provided with a guide slope 14.2.

The support member 11 is at least a leaf spring type bending member, and a plurality of umbrella skirts 11.2 are evenly distributed on the support member 11, and each umbrella skirt 11.2 is arranged at intervals; One end is embedded in the installation slot 5.1.

The copper bars include a left copper bar 16 for parallel expansion L1/L3 phase arranged in the first cabinet 1, a left copper bar 17 for parallel expansion L2 phase, and a parallel expansion L1/L3 phase right copper bar 17 arranged in the second cabinet 2 Copper bar 18 and the right copper bar 19 of the L2 phase in the parallel cabinet; the left and right copper bars 16 and 18 of the L1/L3 phase in the parallel cabinet are folded inward to lead out the extension connection end; the left and right copper bars 17 and 19 of the L2 phase in the parallel expansion The straight copper bar structure leads out the extension connection end.

The connecting plate 7 is at least an L-shaped locking plate, and the side of the L-shaped locking plate is provided with a tapered guide pin and a matching hole.

The first and second cabinets 1, 2 are respectively provided with rear side panels 10, and the opening windows 3 of the first and second cabinets 1, 2 are respectively arranged on the rear side panels 10; the first cabinet 1 or the second cabinet There is a reinforcing connecting plate 20 under the opening window 3 of the body 2; after the combination, the first and second cabinets 1 and 2 clamp the reinforcing connecting plate 20 and are fixed by fasteners, and the fasteners penetrate the first cabinet 1 The rear side panel, the reinforcing connection panel 20 and the rear side panel of the second cabinet 2.

The insulating partition includes a vertical partition 9 arranged in the first cabinet 1, and a bent partition 21 arranged in the second cabinet 2, and the bent partition 21 is provided with an opening 21.1; One end of the vertical partition 9 is butt-joined with the opening 21.1 of the bent partition 21 to form a closed phase-to-phase cabinet at the overlapping position of the copper bar and the extension contact claws 4 of the cabinet.

The air-insulated and sealed switchgear is at least a medium-voltage air-insulated and sealed switchgear; the bent partition 21 includes two bent parts, and the two bent parts are connected and combined into an open bent partition 21 .

The steps of merging the first and second cabinets 1 and 2 in this embodiment are as follows:

The first step is as follows: the positioning reinforcing slats 5 are attached to the four peripheries of the opening windows 3 of the first and second cabinets 1 and 2, and are locked with countersunk screws. Fix the connecting plate 7 with screws on the top of the

The second step is: connect the tail of the expansion contact claw 4 of the cabinet with the copper bar in the first cabinet 1 through the connecting piece 15, and the connecting piece 15 is an elastic pin; ensure that the connecting piece 15 (elastic pin) is vertically inserted into the copper bar Therefore, it is ensured that the expansion contact claw 4 of the parallel cabinet can automatically adapt to the floating position error, and the two compression springs in the expansion contact claw 4 of the parallel cabinet are required to be positioned upward.

The third step is: screw the other end of the left copper bar of the L1/L2/L3 phase of the parallel expansion cabinet with the installed expansion contact claw 4 of the parallel cabinet to the bus discharge line end in a cabinet to be expanded; The L1/L2/L3 right copper bar with round hole end is screwed to the bus outlet end of the other cabinet to be expanded.

The fourth step is: insert the support 11 from the extension contact claw 4 of the cabinet, so as to be embedded in the installation groove 5.1 in the positioning reinforcement strip 5; similarly, insert the support 11 from the copper bar, Therefore, it is embedded in the installation groove 5.1 in the positioning reinforcement strip 5. In addition, it is necessary to ensure that the bending direction of the support member 11 faces the cabinet, and the slot 11.1 in the middle of the support member 11 is smoothly inserted into the copper bar, so that the copper bar is well positioned and supported.

The fifth step is to install the insulating partitions of the first cabinet 1 and the second cabinet 2 respectively.

The sixth step is: paste the annular seal 6 on the positioning reinforcing strip 5 on the first cabinet 1 or the second cabinet 2 to form a closed sealing annular belt, and the first cabinet 1 and the second cabinet 2 are combined At the same time, a seal is formed between the cabinets to prevent condensation and water droplets from entering the sealed chamber inside the cabinet.

The seventh step is: the reinforcing connecting plate 20 is fixed on the rear side plate 10 of the first cabinet body 1 or the second cabinet body 2 with screw locks to ensure that the U-shaped opening of the reinforcing connecting plate 20 faces outside the cabinet.

Finally, start merging the first cabinet 1 and the second cabinet 2, move the first cabinet 1 and the second cabinet 2 in parallel to each other, and first enter into the corresponding Then, the vertical partition 9 of the first cabinet 1 is inserted into the bent partition 21 of the second cabinet 2, and then the right copper bar of the L1/L2/L3 phase of the parallel cabinet is extended. The double-sided slope is inserted at the end, and it is elastically engaged with the expansion contact claw 4 of the cabinet, and automatically adapts to the floating error up and down, and achieves accurate parallel connection. During the period, the quality of the overlap between the copper bar and the expansion contact claw 4 of the cabinet can be observed. . The first cabinet body 1 and the second cabinet body 2 continue to move parallel to each other, the annular seal 6 is in contact with the end surfaces of the positioning reinforcing strips 5 of the first cabinet body 1 and the second cabinet body 2, and then the first cabinet is screwed. The connecting plate 7 at the top of the cabinet 1 and the second cabinet 2 is locked and connected; at the lower part of the oval or square rectangular opening window 3 of the side panel, the reinforcing connecting plate 20 and the first cabinet 1 and the second cabinet 2 are screwed together. The rear side panels are locked together.

The above are preferred embodiments of the present invention, showing and describing the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various Variations and improvements are intended to fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. An air insulation sealing switch cabinet with a side expansion device comprises a first cabinet body (1) and a second cabinet body (2), and is characterized in that the first cabinet body (1) and the second cabinet body (2) are both provided with opening windows (3) for expansion, more than one copper bar is arranged in the opening windows (3) of the first cabinet body and the second cabinet body, and an insulation partition plate is arranged between two adjacent copper bars of the first cabinet body (1) and the second cabinet body (2); before combination, a copper bar of the first cabinet body (1) or the second cabinet body (2) is provided with a combined cabinet expansion contact claw (4) for lapping the copper bar, and each positioning reinforcing lath (5) of the first cabinet body (1) or the second cabinet body (2) is provided with an annular sealing piece (6); the top parts of the first cabinet body and the second cabinet body (1 and 2) are respectively provided with a connecting plate (7), the first cabinet body and the second cabinet body (1 and 2) are combined through the connecting plates (7), the connecting plates (7) between the first cabinet body and the second cabinet body (1 and 2) are respectively provided with a guide piece (8), so that the opening windows (3) of the combined first cabinet body and the combined second cabinet body (1 and 2) are corresponding to each other, and the copper bars of the combined first cabinet body and the combined second cabinet body (1 and 2) are respectively lapped with the cabinet combination expansion contact claws (4); in addition, each positioning reinforcing lath (5) of the combined first and second cabinets (1, 2) is in abutting contact with the annular sealing piece (6) and forms a seal.

2. The air-insulated sealed switch cabinet with the side expansion device according to claim 1, wherein the opening windows (3) of the first and second cabinet bodies (1, 2) are respectively provided with a supporting piece (11) for supporting the copper bar, and the positioning reinforcing bar strip (5) is connected with the supporting piece (11); the supporting pieces (11) of the first and second cabinets (1, 2) are respectively provided with a clamping groove (11.1) for positioning and supporting the copper bar; wherein the copper bar of the first cabinet body (1) is positioned in the clamping groove (11.1), and the copper bar of the first cabinet body (1) is lapped with the cabinet combination expansion contact claw (4); the combined cabinet expansion contact claw (4) comprises an upper contact claw (4.1) and a lower contact claw (4.2), the tail parts of the upper contact claw and the lower contact claw (4.1 and 4.2) are respectively connected with a copper bar of the first cabinet body (1), a rotating part (12) is arranged between the upper contact claw and the lower contact claw (4.1 and 4.2), the rotating part (12) is inserted into the upper contact claw and the lower contact claw (4.1 and 4.2) from top to bottom, part of the rotating part (12) is exposed at the top of the upper contact claw (4.1), and a pressure spring (13) for providing overlapping pressing force of the combined cabinet expansion contact claw (4) and the copper bar is sleeved on the rotating part (12) at the top of the upper contact claw (4.1).

3. The air-insulated sealed switch cabinet with the side extension device according to claim 2, wherein the upper and lower contact claws (4.1, 4.2) are respectively provided with through holes, and the rotating member (12) is in clearance fit with the through holes, so that the upper and lower contact claws (4.1, 4.2) move up and down and rotate along the rotating member (12), and are mounted and limited by the tail parts of the upper and lower contact claws (4.1, 4.2); the tail parts of the upper contact claw and the lower contact claw (4.1 and 4.2) are respectively provided with a mounting hole for inserting the connecting piece (15), the connecting piece (15) is in clearance fit with the mounting hole, the copper bar is provided with a connecting hole corresponding to the connecting piece (15), and the connecting piece (15) is in interference fit with the connecting hole; wherein, the connecting piece (15) is inserted into the tail part of the upper contact claw (4.1), the copper bar and the tail part of the lower contact claw (4.2) from top to bottom.

4. The air-insulated sealed switch cabinet with the side expansion device according to claim 2, wherein an engagement position (4.3) is arranged between the upper and lower contact claws (4.1, 4.2), each copper bar of the first and second cabinet bodies (1, 2) is respectively provided with an expansion end (14), the expansion end (14) is provided with a clamping groove (14.1) matched with the engagement position (4.3), the clamping groove (14.1) is clamped on the engagement position (4.3), the copper bars are overlapped with the combined cabinet expansion contact claw (4) through the engagement position (4.3), the clamping groove (14.1), and the expansion end (14) is provided with a guide inclined plane (14.2).

5. The air insulation sealing switch cabinet with the side expanding device according to claim 2, wherein the supporting member (11) is at least a plate spring type bending member, a plurality of sheds (11.2) are uniformly distributed on the supporting member (11), and each shed (11.2) is arranged at intervals; the positioning reinforcing lath (5) is provided with a mounting groove (5.1) corresponding to the supporting piece (11), and one end of the supporting piece (11) is embedded into the mounting groove (5.1).

6. The air-insulated sealed switch cabinet with the side expansion device according to claim 1, wherein the copper bars comprise a cabinet combination expansion L1/L3 phase left copper bar (16), a cabinet combination expansion L2 phase left copper bar (17) arranged in the first cabinet body (1), a cabinet combination expansion L1/L3 phase right copper bar (18) and a cabinet combination expansion L2 phase right copper bar (19) arranged in the second cabinet body (2), the cabinet combination expansion L1/L3 phase left and right copper bars (16, 18) are folded inwards to lead out expansion connecting ends, and the cabinet combination expansion L2 phase left and right copper bars (17, 19) are led out expansion connecting ends in a straight copper bar structure.

7. The air insulated switchgear with side extension unit according to claim 1, wherein the connecting plate (7) is at least L-shaped locking plate, and L-shaped locking plate is provided with tapered guide pins and matching holes at its side.

8. The air-insulated sealed switch cabinet with the side expansion device according to claim 1, wherein the first and second cabinet bodies (1, 2) are respectively provided with a rear side plate (10), and the opening windows (3) of the first and second cabinet bodies (1, 2) are respectively arranged on the rear side plate (10); a reinforced connecting plate (20) is arranged below the opening window (3) of the first cabinet body (1) or the second cabinet body (2); after combination, the first cabinet body (1) and the second cabinet body (2) clamp the reinforced connecting plate (20) and are fixed through fasteners, and the fasteners penetrate through the rear side plate of the first cabinet body (1), the reinforced connecting plate (20) and the rear side plate of the second cabinet body (2).

9. The air-insulated sealed switch cabinet with the side expansion device according to claim 1, wherein the insulated partition plates comprise a vertical partition plate (9) arranged in the first cabinet body (1) and a bent partition plate (21) arranged in the second cabinet body (2), and the bent partition plate (21) is provided with an opening part (21.1); after combination, one end of the vertical partition plate (9) is in butt joint with an opening part (21.1) of the bent partition plate (21) so as to form a closed inter-phase cabinet shield at the lap joint position of the copper bar and the cabinet combination expansion contact claw (4).

10. The air-insulated switchgear with side extension apparatus according to any of claims 1-9, wherein the air-insulated switchgear is at least a medium-voltage air-insulated switchgear; the bending partition plate (21) comprises two bending pieces, and the two bending pieces are connected and combined into the bending partition plate (21) with an opening.

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