Breaker gas-insulated switchgear

Abstract

The invention relates to the technical field of inflatable cabinets, in particular to a circuit breaker inflatable cabinet which comprises a cabinet body, three bus couplers are arranged on one side wall of the cabinet body, three side expansion sleeves are arranged on the other side wall of the cabinet body, the circuit breaker inflatable cabinet further comprises connecting pieces used for connecting the bus couplers and the corresponding side expansion sleeves, and the bus couplers and the side expansion sleeves are completely the same in structure and size. Comprising an insulating substrate and a conductive rod. One end of the connecting piece is provided with a clamping groove matched with the circular plug of the bus coupler, and the other end of the connecting piece is provided with an arc-shaped groove matched with the circular plug of the side expansion sleeve; one side end, provided with the clamping groove, of the connecting piece is further provided with an annular inserting part matched with the inserting groove; when the annular inserting part is inserted into one corresponding inserting groove along with the connecting piece and the clamping groove of the connecting piece is completely matched with the circular plug, the circular plug is inserted in place; the device has the advantages that the structure is simple, and parts are simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas-filled cabinets, in particular to a circuit breaker gas-filled cabinet. BACKGROUND

[0002] The circuit breaker gas-filled cabinet is a medium and high voltage switchgear with a sealed structure, filled with insulating gas (such as SF6 or dry air) to improve insulation and arc extinguishing performance. Its core includes vacuum circuit breakers, disconnectors, grounding switches and other components, all installed on an insulating support frame and enclosed in a gas-filled metal cabinet.

[0003] The device has the advantages of compact structure, high safety, maintenance-free, etc., and is suitable for power distribution systems, substations and other occasions. The gas-filled design can effectively prevent external environmental influences and significantly reduce the device size. Remote on-off control can be achieved through the operating mechanism, and the three-position disconnector supports switching between running, isolation and grounding states, ensuring safe and reliable operation. The insulating protective cover and fully enclosed structure further reduce the risk of partial discharge and prolong the service life.

[0004] Publication No. CN201922084468.4 discloses a novel high-voltage gas-filled cabinet side expansion structure, which includes left and right side-by-side gas-filled cabinet bodies, the cabinet body side is fixedly connected with a bus tie support, the bus ties on adjacent cabinet bodies are oppositely arranged and connected through a side bracket bus tie, the bus tie support is internally provided with a mounting cavity, the mounting cavity is in the shape of a circular truncated cone and the bottom is fixedly connected with a positioning connector, the end of the positioning connector is conical and is inserted into the side bracket bus tie for positioning, and the shapes of the two ends of the side bracket bus tie are adapted to the mounting cavity and are sleeved in the mounting cavity. The novel high-voltage gas-filled cabinet side expansion structure occupies less space, has low cost, and only needs to reserve the mounting space of the bus tie support on the side of the cabinet for flexible assembly in the process, which is convenient to install and use. However, this technical solution also has the following disadvantages: when multiple gas-filled cabinets are arranged side by side, the traditional method is to directly electrically connect the bus ties and the side expansion sleeve, and the two are adapted but have different structures; due to the heavy weight of the cabinet body, the tightness of the electrical connection can only be observed and judged by experience, and a definitive conclusion cannot be directly obtained. SUMMARY

[0005] The present application aims to provide a circuit breaker gas-filled cabinet to solve the problems in the prior art.

[0006] The present invention solves the technical problem by adopting a technical solution: a circuit breaker gas-filled cabinet, comprising a cabinet body, three busbars provided on one side wall of the cabinet body, three side expansion bushings provided on the other side wall, and a connector for connecting the busbars to corresponding side expansion bushings. When two or more gas-filled cabinets are arranged side by side, each busbar is electrically connected to a corresponding side expansion bushing of another gas-filled cabinet via the connector. The terminal used for the busbars and the side expansion bushings comprises an insulating base and a conductive rod; one end of the conductive rod is provided with a round plug. The insulating base is wrapped around the conductive rod, and the end of the insulating base inside the cabinet is provided with a dustproof groove, and the end outside the cabinet is provided with a plug-in groove; the round plug is located in the plug-in groove; one end of the connector is provided with a snap-in groove that matches the round plug of the mother coupler, and the other end is provided with an arc groove that matches the round plug of the side expansion sleeve; the connector is provided with a side end of the snap-in groove, and is also provided with an annular plug-in portion that matches the plug-in groove; when the annular plug-in portion is inserted into a corresponding plug-in slot along with the connector, and the snap-in slot of the connector is completely adapted to the round plug, it is plugged into place.

[0007] Furthermore, the female coupling and the side expansion sleeve are identical in structure and size, and the three bosses are made of an insulator. This means that the same type of sleeve can be used for both, effectively simplifying component structure and requirements and reducing manufacturing costs.

[0008] Furthermore, the bottom of the slot and the end wall of the annular inserting portion enclose a receiving space, into which the broken pieces of the three bosses enter. The three bosses are made of an insulator. Since the slot and the three bosses are all made of an insulator and are enclosed, they do not affect the normal use of the cabinet.

[0009] Furthermore, the connector is made of metal. In actual use, the connector is first plugged into and fixed on the round plug in the side expansion sleeve, and then plugged into and matched with the mother coupler, which makes it more convenient to achieve rapid electrical connection between the mother coupler, the connector and the side expansion sleeve.

[0010] Furthermore, several connecting plates are fixed to the edges of the top and back surfaces of the cabinet body near the main coupler or the side expansion sleeve, and connecting holes are provided on the connecting plates. When two or more inflatable cabinets are arranged side by side, the electrical connection of the adjacent cabinets is first achieved through the main coupler, the connector and the side expansion sleeve, and then the bolts are passed through the connecting holes of the corresponding connecting plates on the adjacent cabinets to fix them, thereby achieving the fixation of the adjacent inflatable cabinets, preventing the adjacent inflatable cabinets from being detached due to vibration, and improving the stability of the electrical connection of the main coupler, the connector and the side expansion sleeve.

[0011] Furthermore, the cabinet is equipped with three sealed cabinets arranged side by side. Each cabinet houses an isolating circuit breaker at the top and a vacuum circuit breaker with a vacuum interrupter at the bottom. Each isolating circuit breaker has three upper terminals on the top and three lower terminals on the bottom, which connect to the vacuum circuit breaker. Three busbars are installed within the cabinet to provide three-phase synchronous electrical connection for the three isolating circuit breakers. The other end of the conductive rod is the mounting end, which is used to electrically connect to the circuit inside the cabinet. A central screw hole is provided at the center of the mounting end. Fastening holes are provided at the two ends of each busbar corresponding to the central screw holes of the side expansion sleeve or the bus coupler. Screws are passed through the fastening holes and screwed into the central screw holes of the side expansion sleeve or the bus coupler, so that one end of each busbar is electrically connected to the inner end of a bus coupler, and the other end is electrically connected to the inner end of a side expansion sleeve. The middle end of each busbar is electrically connected to the upper terminal of the same phase of the three isolating circuit breakers, and the side expansion sleeve and the bus coupler are electrically connected to the circuit inside the inflatable cabinet through the busbar.

[0012] Furthermore, the power connection end of each vacuum interrupter movable contact is electrically connected to a corresponding branch busbar through a corresponding flexible connection, and each branch busbar is electrically connected to a corresponding conductive post provided at the front end of the cabinet. The conductive post is provided at the front end of the cabinet for easy wiring.

[0013] Furthermore, the branch busbars are made of T2 copper rods, which are integrally formed to reduce the overlap area, lower the loop resistance, and increase the current capacity. The branch busbars are cylindrical in shape, which reduces partial discharge.

[0014] Furthermore, the three boxes in the cabinet together form an installation cavity, which makes the installation of the three isolating circuit breakers and the three vacuum circuit breakers more convenient. The installation cavity is filled with a gas for improving the insulation performance.

[0015] Furthermore, a plurality of reinforcing rods are provided in the installation cavity, and both ends of the plurality of reinforcing rods are fixedly connected to the inner wall of the installation cavity respectively, thereby enhancing the strength of the cabinet and preventing the cabinet from being deformed by stress.

[0016] Furthermore, each box is equipped with an insulating support frame for mounting the isolating circuit breaker and vacuum circuit breaker. Each insulating support frame is equipped with several supporting seats, each with a connection hole in its center. Reinforcement rods are provided with fastening holes at locations corresponding to the connection holes. Screws are passed through these fastening holes and then screwed into the connection holes, thereby securing each insulating support frame within the mounting cavity and making the insulating support frame more stable.

[0017] Beneficial effects of the present invention: 1. When placing two or more inflatable cabinets side by side, first insert and fix one end of the three connectors into the circular plugs in the plug-in slots of the three side expansion sleeves of one cabinet. At this time, the arc-shaped slots of the connectors are in contact with the circular plugs in the side expansion sleeves. Then move another cabinet to align the three female couplers of this cabinet with the three connectors. Then push this cabinet so that the end of the connector with the annular plug-in part is inserted into the circular plug in the plug-in slot of the female coupler. At this time, the circular plug of the female coupler is in contact with the card slot of the connector. At this time, the annular plug-in part is inserted into the corresponding plug-in slot along with the connector, and breaks the three bosses, making a breaking sound to remind the installer that it has been plugged in place.

[0018] 2. The broken pieces of the three bosses enter the corresponding accommodation spaces. Since the materials forming the socket slot and the three bosses are all insulators and are sealed, they do not affect the normal use of the cabinet.

[0019] 3. Use bolts to pass through the connection holes of the corresponding connecting plates on the adjacent cabinets for fixation, thereby achieving the fixation of more than two inflatable cabinets, preventing the adjacent inflatable cabinets from being detached due to vibration, and improving the stability of the electrical connection of the mother coupler, connector and side expansion sleeve.

[0020] 4. All functional components are installed longitudinally on the insulating support frame. This structural design makes the isolating circuit breaker and vacuum interrupter form independent units and are not affected by the deformation of the cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the front structure of the cabinet of the present invention; Figure 2 It is a schematic diagram of the internal structure of the box of the present invention; Figure 3 It is a schematic diagram of a three-dimensional structure of three female couplings of the present invention; Figure 4 2 is a schematic diagram of a half-section structure of the connection between the mother coupling and the connecting piece of the present invention; Figure 5 yes Figure 4 A partial enlarged schematic diagram of point A in the middle; Figure 6 yes Figure 4 Schematic diagram of the half-section structure of the middle connector; Figure 7 This is a schematic diagram of a three-dimensional structure of three side expansion sleeves in the present invention; Figure 8 yes Figure 7 Schematic diagram of the half-section structure of the middle and side expansion casing; Figure 9 This is a schematic diagram of a half-section structure of the mother coupling, connector and side expansion sleeve used in conjunction with each other in the present invention; Figure 10It is a schematic diagram of the three-dimensional structure of the insulating support frame, the isolating circuit breaker and the vacuum circuit breaker during assembly of the present invention; Figure 11 This is another schematic diagram of the three-dimensional structure of the insulating support frame, the isolating circuit breaker and the vacuum circuit breaker when assembled according to the present invention; Figure 12 It is a structural schematic diagram of the grounding device of the present invention; Figure 13 is a schematic structural diagram of the grounding device of the present invention from another angle; Figure 14 It is a cross-sectional schematic diagram of the vacuum circuit breaker in the present invention in the open state and the isolating circuit breaker in the isolated closed state; Figure 15 yes Figure 14 A partial enlarged schematic diagram of point B in the middle; Figure 16 It is a cross-sectional schematic diagram of the isolating circuit breaker of the present invention in the isolating closed state; Figure 17 It is a cross-sectional schematic diagram of the isolating circuit breaker of the present invention in an isolating and opening state; Figure 18 It is a cross-sectional schematic diagram of the isolating circuit breaker of the present invention in the grounded closed state.

[0022] Description of reference numerals: 1. Cabinet; 11. Busbar; 12. Branch busbar; 13. Conductive column; 14. Connector; 110. Mounting cavity; 111. Reinforcement rod; 2. Busbar; 21. Insulation base; 211. Dustproof groove; 212. Plug slot; 2121. Boss; 2122. Accommodation space; 22. Conductive rod; 221. Center screw hole; 222. Round plug; 3. Side expansion sleeve; 4. Box; 5. Isolating circuit breaker; 51. Upper terminal; 511. Upper contact terminal; 512. Upper contact terminal Terminal; 52, lower terminal; 521, lower contact terminal; 5211, auxiliary contact head; 53, isolating shaft; 54, isolating knife assembly; 55, grounding contact terminal; 6, vacuum circuit breaker; 61, driving main shaft; 62, opening and closing cam mechanism; 621, transmission plate; 6211, guide slide; 622, driving cam; 63, vacuum interrupter; 631, insulating cylinder; 632, movable contact; 633, fixed contact; 634, conductive actuator rod; 635, flexible connection; 64, insulation Edge push rod; 641, pressing plate; 642, oblong hole; 643, first guide groove; 644, transmission rod; 65, buffer spring; 66, pressure sleeve; 661, axis pin hole; 67, connecting pin; 7, insulating support frame; 71, side plate; 712, operation opening; 713, lead-in opening; 72, upper positioning seat; 721, upper mounting hole; 722, upper through hole; 723, stop convex portion; 73, rotating shaft mounting plate; 74, middle positioning seat; 741, middle mounting hole; 742, middle through hole; 75. Lower positioning seat; 751. Lower through hole; 76. V-shaped support frame; 761. Bracket fixing hole; 762. Spindle mounting hole; 763. Guide plate; 7631. Second guide groove; 77. Grounding device; 771. Base plate; 7711. Reinforced tube; 772. Sealing cap; 78. Metal fixing plate; 781. Buffer pad; 79. Insulating protective cover; 710. Support seat; 7101. Connecting hole; 8. Connector; 81. Snap-fit ​​groove; 82. Arc groove; 83. Annular plug-in part. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with the embodiments so as to fully understand the purpose, characteristics and effects of the present invention.

[0024] like Figures 1-2 As shown, this embodiment is a circuit breaker gas charging cabinet, comprising a cabinet body 1. Three busbars 2 are provided on one side wall of the cabinet body 1, and three side expansion bushings 3 are provided on the other side wall. The cabinet body 1 also includes connectors 8 for connecting the busbars 2 to corresponding side expansion bushings 3. Each busbar 2 is electrically connected to a corresponding side expansion bushing 3 of another gas charging cabinet via the connectors 8. When two or more gas charging cabinets are arranged side by side, quick electrical connection can be achieved via the busbars 2, connectors 8, and side expansion bushings 3.

[0025] As Figures 3-9 shown in the embodiment, the busbar 2 and the side expansion sleeve 3 are completely same in structure and size, that is, the same terminal is selected and used as the busbar 2 and the side expansion sleeve 3. The terminal used as the busbar 2 and the side expansion sleeve 3 in the embodiment comprises an insulating base 21 and a conductive rod 22; one end of the conductive rod 22 is a mounting end for electrically connecting with the circuit in the gas-filled cabinet, and a center screw hole 221 is arranged at the center of the mounting end, and the other end is provided with a circular plug 222; the insulating base 21 is wrapped on the conductive rod 22, one end of the insulating base 21 in the cabinet 1 is provided with a dustproof groove 211, and the other end of the insulating base 21 outside the cabinet 1 is provided with a plug-in groove 212; the circular plug 222 is located in the plug-in groove 212.

[0026] The connecting piece 8 is made of metal material, and copper is selected in the embodiment. One end of the connecting piece 8 is provided with a clamping groove 81 matched with the circular plug 222 of the busbar 2, and the other end of the connecting piece 8 is provided with an arc-shaped groove 82 matched with the circular plug 222 of the side expansion sleeve 3.

[0027] As Figure 5 shown, the busbar 2 is further provided with a sound generating part, which comprises three bosses 2121 arranged at the ends of the plug-in grooves 212, and the three bosses 2121 are uniformly distributed on the inner circumferential wall of the annular groove at the ends of the plug-in grooves 212; the connecting piece 8 is provided with the clamping groove 81 on one side end, and is further provided with an annular plug-in part 83 matched with the plug-in groove 212. When the annular plug-in part 83 is inserted into the corresponding plug-in groove 212 along with the connecting piece 8, and the clamping groove 81 of the connecting piece 8 is completely matched with the circular plug 222, the annular plug-in part 83 breaks the three bosses 2121, and a breaking sound is generated to remind the installer that the plug-in is in place.

[0028] The bottom of the plug-in groove 212 and the end wall of the annular plug-in part 83 form a containing space 2122, and the broken fragments of the three bosses 2121 enter the containing space 2122. Since the materials forming the plug-in groove 212 and the three bosses 2121 are insulators and are closed, the normal use of the cabinet 1 is not affected.

[0029] The connecting piece 8 is plug-in fixed on the circular plug 222 in the side expansion sleeve 3. In order to more easily understand the drawings, the state that the connecting piece 8 is connected with the busbar 2 is drawn in the drawings. Figure 4 In actual use, the connecting piece 8 is first plug-in fixed on the circular plug 222 in the side expansion sleeve 3, and then is plug-in matched with the busbar 2.

[0030] Several connecting plates 14 are fixed to the edges of the top and back surfaces of the cabinet 1 near the main coupling 2 or the side expansion sleeve 3, and connecting holes 7101 are provided on the connecting plates 14. When two or more gas-filled cabinets are arranged side by side, the electrical connection of the adjacent cabinets 1 is first achieved through the main coupling 2, the connector 8 and the side expansion sleeve 3, and then the bolts are passed through the connecting holes 7101 of the corresponding connecting plates 14 on the adjacent cabinets 1 to fix them, thereby achieving the fixation of more than two gas-filled cabinets, preventing the adjacent gas-filled cabinets from being detached due to vibration, and improving the stability of the electrical connection of the main coupling 2, the connector 8 and the side expansion sleeve 3.

[0031] like Figures 10-11 As shown, the cabinet 1 is equipped with three sealed boxes 4 arranged side by side. Each box 4 houses an isolating circuit breaker 5 at its upper portion, and a vacuum circuit breaker 6 with a vacuum interrupter 63 at its lower portion. Each isolating circuit breaker 5 is equipped with three upper wiring terminals 51 at its upper portion and three lower wiring terminals 52 at its lower portion. The cabinet 1 is equipped with three busbars 11 for synchronous three-phase electrical connection of the three isolating circuit breakers 5. Each busbar 11 has fastening holes at both ends corresponding to the central screw holes 221 of the side expansion bushing 3 or bus coupler 2. Screws are passed through these fastening holes and then screwed into the central screw holes 221 of the side expansion bushing 3 or bus coupler 2. This ensures that one end of each busbar 11 is electrically connected to the inner end of a bus coupler 2, and the other end is electrically connected to the inner end of a side expansion bushing 3. The middle end of each busbar 11 is electrically connected to the upper wiring terminals 51 of the same phase of the three isolating circuit breakers 5.

[0032] The electrical connection end of each vacuum interrupter 63's movable contact 632 is electrically connected to a corresponding branch busbar 12 via a corresponding flexible connector 635. Each branch busbar 12 is then electrically connected to a corresponding conductive post 13 located on the front end of the cabinet 1. The branch busbars 12 are made of T2 copper rods. This integrally formed copper rod reduces the overlap area, lowering loop resistance and increasing current capacity. The cylindrical shape of the branch busbars 12 reduces partial discharge.

[0033] There is no space between the three boxes 4 in the cabinet 1, and they together form an installation cavity 110, which makes it easier to install the three isolation circuit breakers 5 and the three vacuum circuit breakers 6. The installation cavity 110 is filled with a gas for improving insulation performance. In this embodiment, sulfur hexafluoride gas is filled.

[0034] In this embodiment, a plurality of reinforcing rods 111 are provided in the installation cavity 110. Both ends of the plurality of reinforcing rods 111 are fixedly connected to the inner wall of the installation cavity 110, thereby enhancing the strength of the cabinet 1 and preventing the cabinet 1 from being deformed by stress. Each box 4 is equipped with an insulating support frame 7 for mounting the isolating circuit breaker 5 and vacuum circuit breaker 6. Each insulating support frame 7 is provided with a plurality of supporting seats 710, each with a connection hole 7101 defined in its center. Reinforcement rods 111 are provided with fastening holes corresponding to the connection holes 7101. Screws are passed through these fastening holes and then screwed into the connection holes 7101, thereby securing each insulating support frame 7 within the mounting cavity 110.

[0035] like Figures 14-15 As shown, the insulating support frame 7 is composed of two side plates 71, three upper positioning seats 72, two rotating shaft mounting plates 73, three middle positioning seats 74, three lower positioning seats 75, three V-shaped support frames 76 and a grounding device 77. The two side plates 71, three upper positioning seats 72, two rotating shaft mounting plates 73, three middle positioning seats 74, three lower positioning seats 75, three V-shaped support frames 76 and a grounding device 77 are all made of high-performance ceramic materials to ensure excellent insulation performance. The surface of the side plate 71 is provided with horizontal and vertical reinforcement ribs. This design not only enhances the structural strength, but also increases the insulation creepage distance and improves the voltage resistance level of the product. The side plate 71 adopts a non-insert design, which is convenient for later recycling.

[0036] The isolating circuit breaker 5 includes an isolating rotating shaft 53, three isolating knife assemblies 54, three upper wiring terminals 51, three lower wiring terminals 52, and three grounding contact terminals 55. The upper positioning seat 72 adopts a U-shaped structure and is manufactured by a fluid casting one-piece molding process, with its recessed surface facing upward. A through upper through hole 722 is provided in the central area of ​​each upper positioning seat 72, and upper mounting holes 721 are symmetrically arranged on both side ends. In the assembled state, the inner walls of the two side plates 71 respectively maintain abutment with the two ends of the upper positioning seat 72. Fastening holes are processed on the side plates 71 at the positions corresponding to the upper mounting holes 721, and the upper positioning seat 72 is fixed between the side plates 71 by screws passing through the fastening holes and the upper mounting holes 721 in sequence. The upper terminal 51 is formed by a die forging process, and its upper part constitutes the upper power terminal 512, while the lower part serves as the upper contact end 511 and extends downward through the upper through hole 722 corresponding to the upper positioning seat 72, forming an isolation and closing cooperation with the isolation knife assembly 54. In particular, a downwardly protruding stop protrusion 723 is integrated at the bottom of the upper positioning seat 72, and the stop protrusion 723 and the upper positioning seat 72 are manufactured by an integral molding process. When the isolation knife assembly 54 performs the isolation and closing operation, the stop protrusion 723 can effectively limit the movement stroke of the isolation knife assembly 54, prevent overshoot caused by excessive power, and ensure that the isolation and closing position is accurately in place. The screw connection method not only ensures the installation stability of the upper positioning seat 72, but also facilitates subsequent disassembly and maintenance operations.

[0037] like Figures 16-18As shown, two rotating shaft mounting plates 73 are fixed in parallel between the two side vertical plates 71, and the two ends of the isolation rotating shaft 53 are rotatably mounted on the rotating shaft mounting plates 73. Three isolation knife assemblies 54 are fixedly arranged on the isolation rotating shaft 53, and rotate with the isolation rotating shaft 53 to realize switching of the three working positions of isolation closing, isolation opening and grounding closing. The rotating shaft mounting plate 73 can be fixed by inserting the block into the slot in the inner wall of the side vertical plate 71, which is convenient for disassembly.

[0038] When the isolation closing operation is performed, the isolation rotating shaft 53 rotates clockwise by a set angle, driving the isolation knife assembly 54 to rotate synchronously. When the one end of the isolation knife assembly 54 contacts the stop protrusion 723 of the upper positioning seat 72 and contacts the upper contact end 511, and the other end contacts the lower contact end 521 of the lower terminal 52, the closing process is completed. When the isolation opening is performed, the isolation rotating shaft 53 rotates counterclockwise by a corresponding angle, so that the two ends of the isolation knife assembly 54 are separated from the upper contact end 511 and the lower contact end 521 respectively, realizing electrical isolation. When the grounding closing operation is performed, the isolation rotating shaft 53 continues to rotate until the one end of the isolation knife assembly 54 contacts the grounding contact end 55 and is blocked by the buffer pad 781, and the other end contacts the auxiliary contact head 5211 of the lower terminal 52.

[0039] The middle positioning seat 74 also adopts a U-shaped structure, but the concave surface faces downward and is integrally formed by fluid casting. The middle positioning seat 74 is provided with a middle through hole 742 in the middle and middle mounting holes 741 at both ends. The lower terminal 52 passes through the middle through hole 742 as a lower contact end 521, and the lower end is connected with the fixed contact 633 of the vacuum arc-extinguishing chamber 63. The upper end of the lower terminal 52 is provided with an auxiliary contact head 5211 extending to the side away from the grounding contact end 55. The lower terminal 52 and the auxiliary contact head 5211 are designed in one piece, which ensures that the isolation knife assembly 54 can contact the lower terminal 52 to form a stable electrical connection and increase the heat dissipation area of the part during isolation closing and grounding closing. The outer part of the middle positioning seat 74 and the upper positioning seat 72 adopts a large circular arc transition design, which effectively reduces the partial discharge.

[0040] As Figures 12-13As shown, the grounding device 77 consists of two parallel ceramic base plates 771 and four matching sealing caps 772. The base plate 771 is fixedly connected to the outer wall of the side plate 71 through the reinforcing tube portion 7711, and a screw hole is provided in the center of each reinforcing tube portion 7711. A through hole is processed at the corresponding position of the side plate 71, and an annular boss 2121 structure is provided on the inner wall. During installation, the screws pass through the through holes and connect with the screw holes of the reinforcing tube portion 7711 in turn, so that the screw heads are completely immersed in the inner cavity of the annular boss 2121. The sealing cap 772 is tightly matched with the annular boss 2121 by gluing or snapping, completely sealing the entire screw connection part, significantly reducing the risk of partial discharge. A metal fixing plate 78 is provided between the two base plates 771, and three grounding contact terminals 55 are installed on the metal fixing plate 78 to realize the grounding closing function of the isolation knife assembly 54. The use of screw connection facilitates maintenance and disassembly.

[0041] The vacuum circuit breaker 6 consists of a drive shaft 61, three opening and closing cam mechanisms 62 fixed to the drive shaft 61, three vacuum interrupters 63, and three insulating push rods 64. Each vacuum interrupter 63 consists of an insulating cylinder 631, a movable contact 632, a fixed contact 633, and a conductive push rod 634. The opening and closing cam mechanism 62 consists of two transmission plates 621 and two drive cams 622.

[0042] A lower through hole 751 is provided in the middle of the lower positioning seat 75, which is used to fix the lower end of the insulating tube 631 of the vacuum arc chamber 63. During installation, the lower end of the insulating tube 631 is embedded in the lower through hole 751, and the conductive movable rod 634 connected to the internal movable contact 632 extends downward from the insulating tube 631 and is connected to the insulating push rod 64. The two ends of the lower positioning seat 75 can be assembled with the preset slots on the inner wall of the side vertical plate 71 through the plug block, which is convenient for later maintenance. The V-shaped support frame 76 serves as a supporting component for the drive spindle 61, and is provided with bracket fixing holes 761 at both ends, and a spindle mounting hole 762 is processed in the middle. During installation, the two ends of the V-shaped support frame 76 are fitted with the inner wall of the side vertical plate 71, and are fixed by screwing through the corresponding fastening holes of the side vertical plate 71 and then screwing into the bracket fixing holes 761. The drive spindle 61 is rotatably mounted in the spindle mounting hole 762.

[0043] The transmission plate 621 is fixedly mounted on the drive spindle 61 via a sleeve, with two transmission plates 621 symmetrically positioned on either side of each V-shaped support frame 76. The guide slot 6211 on the transmission plate 621 is arc-shaped, with the centerline spacing from the spindle mounting hole 762 increasing in the direction of rotation of the drive spindle 61 when the vacuum circuit breaker 6 is closed. This structure allows the lower wall of the guide slot 6211 to effectively push the drive cam 622 upward during the closing operation of the vacuum circuit breaker 6. The system also includes a pressure sleeve 66 and a connecting pin 67. The lower end of the insulating push rod 64 is coaxially connected to a transmission rod 644. A pressure plate 641 is provided at the upper end of the transmission rod 644, and an oblong hole 642 is provided at the lower end. The pressure sleeve 66 is fitted over the lower end of the transmission rod 644 and has two symmetrical pin holes 661 corresponding to the oblong hole 642. The connecting pin 67 horizontally passes through the pin hole 661 and the oblong hole 642 , and both ends are connected to the driving cam 622 , and the driving cam 622 can slide in the guide slot 6211 .

[0044] A guide plate 763 is provided on the upper portion of the V-shaped support frame 76, which cooperates with the first guide groove 643 provided at the lower end of the transmission rod 644 and the pressure sleeve 66. At the same time, a second guide groove 7631 is provided on the top of the guide plate 763 to cooperate with the connecting pin 67, and the first guide groove 643 and the second guide groove 7631 are arranged crosswise. This dual positioning structure effectively limits the movement trajectory of the insulating push rod 64, ensuring that the transmission rod 644, the insulating push rod 64, the conductive movable rod 634 and the movable contact 632 can only move vertically, avoiding lateral deviation. The buffer spring 65 is sleeved on the transmission rod 644, and its two ends are in contact with the clamping plate 641 and the pressure sleeve 66 respectively, providing stable contact pressure for the movable contact 632 and the fixed contact 633.

[0045] During the closing process of the vacuum interrupter 63, the drive shaft 61 rotates, driving the transmission plate 621. The specially curved design of the guide slot 6211 causes its lower wall to push the drive cam 622 upward. The drive cam 622, via the connecting pin 67, drives the pressure sleeve 66 upward, which in turn pushes the buffer spring 65, transmission rod 644, insulating push rod 64, and conductive actuator rod 634 upward, allowing the movable contact 632 to elastically contact the fixed contact 633, effectively reducing contact resistance. During the opening process of the vacuum interrupter 63, the drive shaft 61 rotates in the opposite direction. The upper wall of the guide slot 6211 pulls the drive cam 622 downward, driving the entire transmission mechanism downward via the connecting pin 67, quickly separating the movable contact 632 from the fixed contact 633. Throughout this movement, the coordination of the guide plate 763 with the first and second guide slots 643 and 7631 ensures that the transmission system moves only in the vertical direction, preventing lateral deviation.

[0046] Insulating shields 79 are installed on all exposed screw connections, flexible connectors 635, and the exterior of auxiliary contacts 5211 on the side panels 71. These shields are secured to the side panels 71 using snap-fits, forming an insulating barrier. The lower terminal blocks 52 of the disconnector 5 and the fixed contacts 633 of the vacuum interrupter 63 are integrated. The conductive actuator 634 is connected to the external branch busbar 12 via a flexible connector 8. Three operating openings 712 are provided on the side panels 71 for movement of the disconnector blade assembly 54, and a lead-in opening 713 is provided to facilitate wiring of the flexible connectors 635.

[0047] Each grounding contact 55 on the metal fixing plate 78 is secured with three screws, ensuring both connection strength and ease of maintenance. The metal fixing plate 78 also features three buffer pads 781, which control the final position of the isolation blade assembly 54 during grounding closure, effectively preventing overshoot. When the side plate 71 reaches the end of its service life, simply remove the screws for separate recycling of the components.

[0048] Working process: When two or more inflatable cabinets are placed side by side, first, one end of the three connectors 8 is plugged and fixed onto the circular plugs 222 in the insertion slots 212 of the three side expansion sleeves 3 of one counter. At this time, the arc-shaped slots 82 of the connectors 8 are in contact with the circular plugs 222 in the side expansion sleeves 3. Then, another cabinet 1 is moved so that the three female couplers 2 of the cabinet 1 are aligned with the three connectors 8. Then, the cabinet 1 is pushed so that the end of the connector 8 with the annular plug portion 83 is inserted into the circular plug 222 in the insertion slot 212 of the female coupler 2. At this time, the circular plug 222 of the female coupler 2 is in contact with the snap-in slot 81 of the connector 8. At this time, the annular plug portion 83 is inserted into the corresponding insertion slot 212 along with the connector 8, and breaks the three bosses 2121, making a breaking sound to remind the installer that the connection has been made. The broken fragments of the three bosses 2121 enter the corresponding accommodating spaces 2122. Because the materials forming the insertion slots 212 and the three bosses 2121 are all insulators and are enclosed, they do not affect the normal use of the cabinet 1. Bolts are then passed through the connection holes 7101 of the corresponding connecting plates 14 on the adjacent cabinets 1 to secure them, thereby securing two or more inflatable cabinets, preventing adjacent inflatable cabinets from becoming disengaged due to vibration, and improving the stability of the electrical connection between the female coupler 2, the connector 8, and the side expansion sleeve 3.

[0049] All functional components are longitudinally mounted on the insulating support frame 7. This structural design enables the isolating circuit breaker 5 and the vacuum interrupter 63 to form an independent unit, which is not affected by the deformation of the cabinet 1.

[0050] The above embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

Claims

1. A circuit breaker gas-filled cabinet, comprising a cabinet (1), wherein three busbars (2) are provided on one side wall of the cabinet (1), and three side expansion sleeves (3) are provided on the other side wall, and further comprising a connector (8) for connecting the busbars (2) and corresponding side expansion sleeves (3), wherein when two or more gas-filled cabinets are arranged side by side, each busbar (2) is electrically connected to a corresponding side expansion sleeve (3) of another gas-filled cabinet via the connector (8); a terminal used for the busbars (2) and the side expansion sleeve (3), comprising an insulating base (21) and a conductive rod (22); a circular plug (222) is provided at one end of the conductive rod (22); the insulating base (21) is wrapped around the conductive rod (22), a dustproof groove (211) is provided at one end of the insulating base (21) located inside the cabinet (1), and a plug-in groove (212) is provided at one end of the insulating base (21) located outside the cabinet (1); the circular plug (222) is located in the plug-in groove (212); Its characteristics are: One end of the connecting piece (8) is provided with a snap-fit ​​groove (81) that matches the circular plug (222) of the female coupling (2), and the other end is provided with an arcuate groove (82) that matches the circular plug (222) of the side expansion sleeve (3); the connecting piece (8) is provided with a side end of the snap-fit ​​groove (81), and is also provided with an annular plug-in portion (83) that matches the plug-in groove (212); When the annular plug-in portion (83) is inserted into a corresponding plug-in slot (212) along with the connecting piece (8), and the connecting piece (8)'s snap-in slot (81) is completely matched with the circular plug (222), the plug-in is in place.

2. A circuit breaker inflatable cabinet according to claim 1, characterized in that: The mother coupling (2) and the side expansion sleeve (3) are completely identical in structure and size; the material of the three bosses (2121) is an insulator.

3. The circuit breaker inflatable cabinet according to claim 1, characterized in that: The connecting piece (8) is made of metal. In actual use, the connecting piece (8) is first plugged and fixed on the circular plug (222) in the side expansion sleeve (3), and then plugged and matched with the mother coupler (2).

4. The circuit breaker inflatable cabinet according to claim 1, characterized in that: A plurality of connecting pieces (14) are fixed to the edges of the top and back surfaces of the cabinet (1) near the mother coupling (2) or the side expansion sleeve (3), and the connecting pieces (14) are provided with connecting holes (7101). When two or more gas cabinets are arranged side by side, the adjacent cabinets (1) are first electrically connected through the mother coupling (2), the connecting piece (8) and the side expansion sleeve (3), and then bolts are passed through the connecting holes (7101) of the corresponding connecting pieces (14) on the adjacent cabinets (1) to fix them, thereby fixing the adjacent gas cabinets.

5. The circuit breaker inflatable cabinet according to claim 1, characterized in that: Three sealed boxes (4) are arranged side by side in the cabinet (1), an isolating circuit breaker (5) is provided at the upper part of each box (4), and a vacuum circuit breaker (6) with a vacuum interrupter (63) is provided at the lower part of each box (4); three upper wiring terminals (51) are provided at the upper part of each isolating circuit breaker (5), and three lower wiring terminals (52) are provided at the lower part, and the lower wiring terminals (52) are connected to the vacuum circuit breaker (6); three busbars (11) are provided in the cabinet (1) for realizing three-phase synchronous electrical connection of the three isolating circuit breakers (5); the other end of the conductive rod (22) is a mounting end for connecting to the The circuit inside the cabinet (1) is electrically connected. A central screw hole (221) is provided at the center of the mounting end. Fastening holes are provided at the two ends of each busbar (11) corresponding to the central screw hole (221) of the side expansion sleeve (3) or the mother coupler (2). Screws are passed through the fastening holes and then screwed into the central screw hole (221) of the side expansion sleeve (3) or the mother coupler (2), so that one end of each busbar (11) is electrically connected to the inner end of a mother coupler (2), and the other end is electrically connected to the inner end of a side expansion sleeve (3). The middle end of each busbar (11) is electrically connected to the upper wiring terminals (51) of the same phase of the three isolating circuit breakers (5).

6. The circuit breaker inflatable cabinet according to claim 5, characterized in that: The power connection end of the movable contact (632) of each vacuum interrupter (63) is electrically connected to a corresponding branch busbar (12) through a corresponding soft connection (635), and each branch busbar (12) is further electrically connected to a corresponding conductive column (13) provided on the front end of the cabinet (1).

7. The circuit breaker inflatable cabinet according to claim 6, characterized in that: The branch busbar (12) is made of T2 copper rods, which are integrally formed. The branch busbar (12) has a cylindrical shape.

8. The circuit breaker inflatable cabinet according to claim 6, characterized in that: The three boxes (4) in the cabinet (1) together form an installation cavity (110), and the installation cavity (110) is filled with gas for increasing insulation performance.

9. The circuit breaker inflatable cabinet according to claim 8, characterized in that: A plurality of reinforcing rods (111) are provided in the installation cavity (110), and two ends of the plurality of reinforcing rods (111) are respectively fixedly connected to the inner wall of the installation cavity (110).

10. The circuit breaker inflatable cabinet according to claim 9, characterized in that: An insulating support frame (7) is provided in each box (4) for mounting an isolating circuit breaker (5) and a vacuum circuit breaker (6); a plurality of supporting seats (710) are provided on each insulating support frame (7), a connecting hole (7101) is provided at the center of the supporting seat (710), and a fastening hole is provided at a position corresponding to the connecting hole (7101) of the reinforcing rod (111). A screw is passed through the fastening hole and then screwed into the connecting hole (7101), thereby fixing each insulating support frame (7) in the mounting cavity (110).

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