A switch cabinet with magnetic blow load switch

Abstract

The invention discloses a switch cabinet with a magnetic blowout load switch, comprising a cabinet body, a cable compartment, a mechanism chamber, a closed gas chamber and a fuse chamber arranged in the cabinet body, a three-phase top insulating sleeve arranged on the top of the closed gas chamber, a three-phase bottom insulating sleeve arranged on the bottom of the fuse chamber, the three-phase bottom insulating sleeve penetrates into the cable compartment to connect the incoming and outgoing cables, a three-phase magnetic blowout load switch is installed in the closed gas chamber, an operating mechanism of the load switch is installed above the mechanism chamber, the operating mechanism of the load switch is located outside the front plate of the closed gas chamber, a three-phase fuse is arranged in the fuse chamber, a fuse striker tripping mechanism is installed below the mechanism chamber, and a small fuse grounding switch is also installed in the fuse chamber. The invention increases a strong magnetic field through a magnetic blowout arc extinguishing assembly to directional drain and concentrate arc electron ions, quickly cuts and extinguishes the arc through an arc extinguishing device, effectively improves the arc extinguishing ability of the load switch, and solves the technical problem of low arc extinguishing ability of the load switch in the high-voltage load switch cabinet.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinets, in particular to a switch cabinet with a magnetic blow load switch. Background Art

[0002] The arc extinguishing capability of the traditional switchgear with load switches directly determines the operating safety and reliability of the high-voltage switchgear. With the continuous development of the high-voltage power distribution field, the safety and reliability of the performance of the high-voltage switchgear have been better demanded, and the arc extinguishing capability of the load switch needs to be improved. The traditional high-voltage switchgear usually uses arc-starting rods, air-blowing structures, etc. to achieve arc extinguishing of the load switch to break the high-voltage circuit. The cost is high, the volume is large, the arc extinguishing efficiency is limited, and the reliability is low. The service life is short, and it cannot meet the needs of the distribution network and ensure the personal safety of the operation and maintenance personnel. In addition, the three-phase fuses of the traditional high-voltage switchgear are often arranged horizontally or vertically, and the switchgear is large in size. It causes a certain waste of resources such as land. The traditional high-voltage switchgear has fewer electrical and mechanical locking functions, and there are safety hazards for operation and maintenance personnel. The protection level of the traditional high-voltage switchgear is low, and it cannot be applied to the distribution network scenarios with harsh climates. Summary of the invention

[0003] In order to solve the technical problem mentioned in the background technology, the present invention provides a switch cabinet with a magnetic blow load switch.

[0004] The present invention adopts the following technical solution: a switch cabinet with a magnetic blow load switch, comprising a cabinet body;

[0005] The cabinet is equipped with cable compartment, mechanism compartment, closed gas compartment and fuse compartment;

[0006] in,

[0007] The fuse compartment is installed above and behind the cable compartment;

[0008] The closed gas chamber is installed above the fuse chamber;

[0009] The mechanism chamber is installed above the cable compartment and in front of the fuse chamber and the closed gas chamber;

[0010] A three-phase top insulating sleeve is arranged on the top of the closed gas chamber;

[0011] A three-phase bottom insulating sleeve is arranged at the bottom of the fuse chamber;

[0012] The three-phase bottom insulating sleeve passes through the cable compartment to connect the incoming and outgoing cables;

[0013] Install a three-phase magnetic blow-out load switch in the closed gas chamber;

[0014] The three-phase top insulating sleeves are respectively connected to the top of the three-phase magnetic blow-out load switch through copper busbars;

[0015] The operating mechanism of the load switch is installed above the mechanism room;

[0016] The operating mechanism of the load switch is located outside the front plate of the closed air chamber and is connected to the insulating main shaft of the three-phase magnetic blowout load switch through the driving component;

[0017] Three-phase fuses are arranged in the fuse room;

[0018] The three-phase fuses are arranged in a triangle shape;

[0019] The bottom of the three-phase magnetic blow-out load switch is connected to the conductive terminal in the middle of the three-phase fuse body through three copper busbars;

[0020] The bottom of the three-phase fuse barrel and the three-phase bottom insulating sleeve are connected and conducted through a copper busbar;

[0021] A fuse striker tripping mechanism is installed at the lower part of the mechanism chamber;

[0022] The fuse striker tripping mechanism is connected to the operating mechanism of the load switch through a tripping cable, and the fuse striker tripping mechanism is correspondingly installed on the front of the three-phase fuse and fastened to the outer side of the front plate of the fuse chamber, and is used to transmit an action signal to the operating mechanism of the load switch when the three-phase fuse is blown, so that the operating mechanism of the load switch drives the three-phase magnetic blow load switch to perform a tripping action;

[0023] A small fuse grounding switch is also installed in the fuse room;

[0024] The small fuse earthing switch is located at the inner bottom of the fuse compartment;

[0025] The small grounding switch of the fuse is connected to the insulating main shaft of the three-phase magnetic blow-out load switch through the grounding pull rod. When the insulating main shaft rotates to the load switch for grounding closing operation, the three copper busbars between the three-phase fuse and the three-phase bottom insulating sleeve are short-circuited to ground.

[0026] Furthermore, the three-phase magnetic blow load switch includes a switch mounting frame; a top beam and a lower beam arranged in parallel are installed at the rear of the switch mounting frame; the insulating main shaft is arranged in parallel between the top beam and the lower beam, the tail end of the insulating main shaft is connected to one end of the switch mounting frame through a bearing, and the front end of the insulating main shaft passes through a corresponding hole at the other end of the switch mounting frame and is connected to the operating mechanism of the load switch; a grounding beam is installed in front of the switch mounting frame, and a grounding bus is installed on the grounding beam; three grounding contacts are arranged at intervals on the grounding bus; three upper epoxy insulators are installed at equal intervals on the top beam; and three upper epoxy insulators are installed at equal intervals on the lower beam. Three lower epoxy insulators are installed at intervals; the upper epoxy insulator and the lower epoxy insulator are aligned and arranged, and a static contact connection row is arranged on the upper epoxy insulator; a moving contact connection row is installed on the lower epoxy insulator; a static contact is installed on the static contact connection row; a magnetic blow-out arc extinguishing assembly is installed on the top of the static contact; the magnetic blow-out arc extinguishing assembly is tilted downward and forms a certain inclination angle with the end face of the static contact; three insulating crank arms are fixedly arranged at equal intervals on the insulating main shaft; the front end of the insulating crank arm is connected to the insulating pull rod; a moving contact knife sleeve is arranged at the front end of the insulating pull rod; the moving contact connection row is connected to the end pin shaft of the moving contact assembly; the front end of the moving contact assembly is sleeved in the moving contact knife sleeve.

[0027] Furthermore, the moving contact assembly includes a pair of moving blades arranged in parallel; a distance metal support sleeve is arranged between the pair of moving blades so that a U-shaped space for clamping the stationary contact is formed therebetween.

[0028] Furthermore, the magnetic blowout arc extinguishing assembly includes a plastic mold frame; the plastic mold frame includes a grid frame head and a grid frame body; the grid frame head is fixed to the top of the static contact by bolts; a plurality of grid plate slots are sequentially opened on the lower side of the grid frame body for correspondingly installing a plurality of arc extinguishing grid plates; each arc extinguishing grid plate is generally H-shaped with a narrow upper portion and a wide lower portion, and the narrow opening on the arc extinguishing grid plate is a U-shaped snap-in opening for fitting into the grid plate slot; an inverted U-shaped arc guiding channel is stamped on three sides of the lower wide opening of the arc extinguishing grid plate; a magnetic bin with a rectangular cavity opened at one end is opened in the center of the grid frame body for installing a permanent magnet.

[0029] Furthermore, the three-phase fuses are respectively installed in three corresponding holes below the front plate of the mechanism chamber and are sealed by O-rings.

[0030] Furthermore, the fuse striker tripping mechanism includes a mechanism frame, which is fixedly mounted on the outer side of the front plate of the fuse chamber; a mounting hole corresponding to the position of the three-phase fuse is arranged on the mechanism frame; a striker mechanism top cover is arranged on the mounting hole; an insulating silicone cone is arranged between the striker mechanism top cover and the mounting hole; a striker insulating cylinder is installed in the inner hole of the insulating silicone cone; a striker rod is installed in the center of the striker insulating cylinder; the striker rod can slide up and down, and its top end is directly opposite to the striker machine tripping rotating plate; one end of the striker machine tripping rotating plate is clamped on the striker mechanism top cover; the other end is connected to the tripping rotating plate through a first connecting rod Rotating rod; a pair of the trip rotating rods are arranged and are respectively located on both sides of the three-phase fuse; when one of the fuses blows, the thrust generated at its tail end is sufficient to pop out the striker rod, and the popped-out striker rod hits the tripping turn plate of the striker machine, and the tripping turn plate of the striker machine rotates and presses down the trip rotating rod to rotate it, and the top end of the trip rotating rod is connected to the tripping indicator through the second connecting rod to cause its position to shift, and the front end of the tripping indicator is connected to the tripping cable, and the tripping cable is connected to the driving component of the operating mechanism of the load switch, which is used to drive the three-phase magnetic blow load switch to open.

[0031] Furthermore, the small grounding switch of the fuse includes a grounding mounting frame and a grounding square shaft; the two ends of the grounding square shaft are assembled in the rotating shaft holes on both sides of the grounding mounting frame; three grounding contacts are arranged at equal intervals on the grounding square shaft; one end of the grounding square shaft is movably connected to the front end of the driven crank arm; the other end is connected to the grounding connection row; the end of the driven crank arm is movably connected to the front end of the transmission connecting rod; the end of the transmission connecting rod is connected to the bottom angle of one side of the triangular active rotating plate; the top of the triangular active rotating plate is rotatably connected to the rotating hole at the top of the grounding mounting frame; the other bottom angle of the triangular active rotating plate is connected to the bottom of the grounding pull rod; the top of the grounding pull rod is rotatably connected to the insulating main shaft of the three-phase magnetic blow load switch through the crank arm.

[0032] Furthermore, the inner wall of the cabinet is equipped with fireproof high-pressure laminated boards; reinforcing bevel ribs are installed at the angles of each surface of the inner wall of the cabinet; a circular high-pressure explosion relief device is arranged at the bottom of the cabinet; and a high-temperature resistant, moisture-absorbing and fireproof sponge is attached to the gap between the overlapping surfaces of the cabinet.

[0033] Furthermore, a cable compartment door is arranged on the front of the cable compartment; a load mechanism operation panel is arranged on the front of the mechanism room; the load mechanism operation panel is provided with a grounding switch opening and closing indication and a load switch opening and closing indication; and a fuse compartment panel is arranged on the front of the fuse room.

[0034] Compared with the prior art, the advantages of the present invention are: the switch cabinet with a magnetic blowout load switch designed by the present invention increases the strong magnetic field through the magnetic blowout arc extinguishing component to directionally drain and concentrate the arc electron ions, and then quickly cuts the arc and extinguishes the arc through the arc extinguishing device, thereby effectively improving the arc extinguishing ability of the load switch and solving the technical problem of low arc extinguishing ability of the load switch in the high-voltage load switch cabinet.

[0035] The switch cabinet with a magnetic blow-out load switch designed by the present invention arranges three-phase fuses in a compact herringbone shape, and arranges components such as switch mechanisms in a compact and reasonable manner, thereby significantly improving the space utilization rate in the cabinet.

[0036] The switch cabinet with a magnetic blow load switch of the present invention provides a small fuse grounding switch at the lower end of the fuse to perform grounding protection on the load side of the fuse, thereby avoiding accidents and improving the protection level of the switch cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a front view of the switch cabinet with a magnetic blow load switch of the present invention;

[0038] Figure 2 for Figure 1 AA view;

[0039] Figure 3 It is a schematic diagram of the overall structure of the three-phase magnetic blowout load switch of the present invention;

[0040] Figure 4 It is a front schematic diagram of the three-phase magnetic blowout load switch of the present invention;

[0041] Figure 5 It is a side schematic diagram of the three-phase magnetic blowout load switch of the present invention;

[0042] Figure 6 It is a schematic diagram of the overall structure of the magnetic blowout arc extinguishing assembly of the present invention;

[0043] Figure 7 It is a front cross-sectional view of the magnetic blowout arc extinguishing assembly of the present invention;

[0044] Figure 8 It is a schematic diagram of the overall structure of the three-phase fuse of the present invention;

[0045] Fig. 9 It is a schematic diagram of the overall structure of the fuse striker tripping mechanism of the present invention;

[0046] Fig.10 for Fig. 9 AA direction schematic diagram;

[0047] Fig.11 It is a schematic diagram of the overall structure of the small grounding switch of the fuse of the present invention;

[0048] Fig.12 It is a schematic diagram of the overall structure of the cabinet of the present invention.

[0049] in:

[0050] 1- cabinet, 2- three-phase top insulating sleeve, 3- three-phase bottom insulating sleeve, 4- three-phase magnetic blow load switch, 5- load switch operating mechanism, 6- three-phase fuse, 7- fuse striker tripping mechanism, 8- fuse small earthing switch,

[0051] 11-cable compartment, 12-mechanism room, 13-enclosed gas chamber, 14-fuse compartment, 15-fireproof high-pressure laminated board, 16-reinforced bevel ribs, 17-circular high-pressure explosion relief device, 18-cable compartment door, 19-load mechanism operation panel, 20-fuse compartment panel,

[0052] 4-1-insulating main shaft, 4-2-switch mounting frame, 4-3-top crossbeam, 4-4-lower crossbeam, 4-5-grounding beam, 4-6-grounding busbar, 4-7-grounding contact, 4-8-upper epoxy insulator, 4-9-lower epoxy insulator, 4-10-static contact connection row, 4-11-moving contact connection row, 4-12-static contact, 4-13-magnetic blow-out arc extinguishing assembly, 4-14-insulating crank arm, 4-15-insulating pull rod, 4-16-moving contact knife sleeve, 4-17-moving blade,

[0053] 4-13-1-grid head, 4-13-2-grid body, 4-13-3-arc extinguishing grid, 4-13-4-inverted U-shaped arc guide channel, 4-13-5-magnetic bin, 4-13-6-permanent magnet,

[0054] 7-1-mechanism frame, 7-2-striker mechanism top cover, 7-3-insulating silicone cone, 7-4-striker insulating cylinder, 7-5-striker rod, 7-6-striker machine tripping plate, 7-7-first connecting rod, 7-8-tripping rotating rod, 7-9-second connecting rod, 7-10-tripping indicator, 7-11-tripping cable,

[0055] 8-1-grounding mounting frame, 8-2-grounding square shaft, 8-3-grounding contact, 8-4-driven crank arm, 8-5-grounding connecting row, 8-6-transmission connecting rod, 8-7-triangular active rotating plate, 8-8-grounding pull rod. DETAILED DESCRIPTION

[0056] In order to facilitate those skilled in the art to understand the technical solution of the present invention, further description will be given below with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention.

[0057] In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may be implemented without these specific details. In addition, in the following description, descriptions of known structures and techniques are omitted to avoid unnecessary confusion of concepts of the present invention.

[0058] Please combine Figure 1-2 As shown, the switch cabinet with magnetic blow load switch designed by the present invention includes a cabinet body 1, wherein a cable compartment 11, a mechanism chamber 12, a closed air chamber 13 and a fuse chamber 14 are arranged in the cabinet body 1, and the fuse chamber 14 is installed above the rear of the cable compartment 11 and fastened with screws. The closed air chamber 13 is installed above the fuse chamber 14, and the mechanism chamber 12 is installed above the cable compartment 11 and is located in front of the fuse chamber 14 and the closed air chamber 13, and they are fastened to each other with screws. A three-phase top insulating sleeve 2 is arranged on the top of the closed air chamber 13, and a three-phase bottom insulating sleeve 3 is arranged at the bottom of the fuse chamber 14. The three-phase bottom insulating sleeve 3 passes through the cable compartment 11 to connect the incoming and outgoing cables. During specific implementation, a cable compartment door 18 is arranged on the front of the cable compartment 11, a load mechanism operation panel 19 is arranged on the front of the mechanism chamber 12, and a gas pressure gauge, a grounding switch opening and closing indicator, and a load switch opening and closing indicator are arranged on the load mechanism operation panel 19; a fuse compartment panel 20 is arranged on the front of the fuse chamber 14.

[0059] like Figure 2 As shown, a three-phase magnetic blowout load switch 4 is installed in the closed air chamber 13 , and the three-phase magnetic blowout load switch 4 is installed on the inner side of the front plate of the closed air chamber 13 . The three-phase top insulating sleeve 2 is connected to the top of the three-phase magnetic blowout load switch 4 through a copper busbar. The operating mechanism 5 of the load switch is installed on the upper part of the mechanism chamber 12. The operating mechanism 5 of the load switch is located on the outer side of the front plate of the closed gas chamber 13, and is connected to the insulating main shaft 4-1 of the three-phase magnetic blowout load switch 4 through a driving component and a sealing sleeve. The three-phase fuse 6 is arranged in the fuse chamber 14. The three-phase fuse 6 is arranged in a herringbone shape. The bottom of the three-phase magnetic blowout load switch 4 is connected and conducted with the conductive terminal in the middle of the three-phase fuse 6 barrel through three copper busbar bars. The bottom of the three-phase fuse 6 barrel is connected and conducted with the three-phase bottom insulating sleeve 3 through the copper busbar. A high-voltage fuse is installed inside the three-phase fuse 8. The high-voltage fuse connects and conducts the conductive terminals of the three-phase fuse barrel and the bottom of the barrel. At this time, three complete power supply lines are formed between the three-phase top insulating sleeve 2 and the three-phase bottom insulating sleeve 3.

[0060] In addition, in the present embodiment, a fuse striker tripping mechanism 7 is installed at the lower part of the mechanism chamber 12, and the fuse striker tripping mechanism 7 is connected to the operating mechanism 5 of the load switch through a tripping cable 7-11, and the fuse striker tripping mechanism 7 is correspondingly installed on the front of the three-phase fuse 6, and is fastened to the outer side of the front plate of the fuse chamber 14, and is used to transmit an action signal to the operating mechanism 5 of the load switch when the three-phase fuse 6 blows, so that the operating mechanism 5 of the load switch drives the three-phase magnetic blow load switch 4 to perform a tripping action when the fuse blows.

[0061] A small fuse grounding switch 8 is also installed in the fuse chamber 14, and the small fuse grounding switch 8 is located at the inner bottom of the fuse chamber 14. The small fuse grounding switch 8 is connected to the insulating main shaft 4-1 of the three-phase magnetic blow load switch 4 through the grounding pull rod 8-8, and the grounding pull rod further links the small fuse grounding switch 8 to operate. When the insulating main shaft 4-1 rotates to the three-phase magnetic blow load switch 4 to perform the grounding closing operation, the three copper busbars between the three-phase fuse 6 and the three-phase bottom insulating sleeve 3 are short-circuited and grounded. The small fuse grounding switch 8 is connected to the air chamber shell, and the air chamber shell is connected to the earth grounding system. The copper busbar between the three-phase fuse 6 and the load switch 9 is also short-circuited and grounded after the three-phase magnetic blow load switch 4 is grounded and closed. At this time, the grounding of both sides of the three-phase fuse 8 is realized, which is convenient for the safe inspection and replacement of the internal high-voltage fuse.

[0062] like Figure 3-5As shown, the three-phase magnetic blowout load switch 4 designed in the present invention also includes a switch mounting frame 4-2. The switch mounting frame is formed by punching and shearing high-strength steel and precision argon arc welding. A top crossbeam 4-3 and a lower crossbeam 4-4 arranged in parallel are installed at the rear of the switch mounting frame 4-2, and an insulating main shaft 4-1 is arranged in parallel between the top crossbeam 4-3 and the lower crossbeam 4-4. The tail end of the insulating main shaft 4-1 is connected to one end of the switch mounting frame 4-2 through a bearing, and the front end of the insulating main shaft 4-1 passes through the corresponding hole at the other end of the switch mounting frame 4-2 and is connected to the operating mechanism 5 of the load switch. A grounding beam 4-5 is installed in front of the switch mounting frame 4-2, and a grounding bus 4-6 is installed on the grounding beam 4-5. Three grounding contacts 4-7 are arranged at intervals on the grounding bus 4-6. Three upper epoxy insulators 4-8 are installed at equal intervals on the top crossbeam 4-3, and three lower epoxy insulators 4-9 are installed at equal intervals on the lower crossbeam 4-4. The upper epoxy insulators 4-8 and the lower epoxy insulators 4-9 are arranged in alignment. The upper epoxy insulator 4-8 and the lower epoxy insulator 4-9 are integrally cast with epoxy materials having high insulation performance and high crack resistance. The upper epoxy insulator 4-8 is provided with a static contact connection row 4-10, the lower epoxy insulator 4-9 is provided with a moving contact connection row 4-11, and the static contact 4-12 is provided on the static contact connection row 4-10. The static contact connection row and the static contact are both die-casted with copper bars and silver-plated on the surface. The top of the static contact 4-12 is equipped with a magnetic blow-out arc assembly 4-13, which is tilted downward and forms a certain tilt angle with the end face of the static contact 4-12. Three insulating arms 4-14 are fixedly arranged at equal intervals on the insulating main shaft 4-1. The front end of the insulating arm 4-14 is connected to the insulating pull rod 4-15. The front end of the insulating pull rod 4-15 is provided with a moving contact knife sleeve 4-16. The moving contact connection row 4-11 is connected to the end pin shaft of the moving contact assembly; the front end of the moving contact assembly is sleeved in the moving contact knife sleeve 4-16. Among them, the moving contact assembly includes a pair of parallel arranged moving blades 4-17, which are die-casted from a copper row and silver-plated on the surface. A fixed-distance metal support sleeve is arranged between the pair of moving blades 4-17 so that a U-shaped space for clamping the static contact 4-12 is formed between the two.

[0063] Specifically, when the three-phase magnetic blowout load switch 4 is in use, the insulating main shaft 4-1 rotates under the drive of the operating mechanism 5 of the load switch, driving the moving contact assembly to rotate and come into pressure contact with the static contact 4-12, thereby achieving isolation and closing, and connecting the circuit. Driven by the operating mechanism 5 of the load switch, the insulating main shaft 4-1 rotates to drive the moving contact assembly to separate from the static contact 4-12, thereby achieving isolation and opening, and disconnecting the circuit. Driven by the mechanism, the insulating main shaft 4-1 rotates, driving the moving contact assembly to come into pressure contact with the grounding contact 4-7, thereby achieving grounding and closing, and grounding the circuit. Among them, the operating mechanism 5 of the load switch involved in this embodiment is a conventional technical means, which will not be described in detail here.

[0064] like Figure 6-7 As shown, in this embodiment, three groups of magnetic arc-extinguishing assemblies are designed. The magnetic arc-extinguishing assembly 4-13 includes a plastic mold frame. The plastic mold frame includes a grid head 4-13-1 and a grid body 4-13-2. The grid head 4-13-2 is fixed to the top of the static contact 4-12 by bolts. A plurality of grid slots are sequentially opened on the lower side of the grid body 4-13-2 for correspondingly installing a plurality of arc-extinguishing grids 4-13-3. The plurality of arc-extinguishing grids 4-13-3 are evenly arranged in the grid slots at equal intervals. Each arc-extinguishing grid 4-13-3 is in an H-shape with a narrow top and a wide bottom. The upper narrow opening of the arc-extinguishing grid 4-13-3 is a U-shaped snap-on opening, which is used to fit into the grid slot. The lower wide opening of the arc-extinguishing grid 4-13-3 is punched with an inverted U-shaped arc-guiding channel 4-13-4 on three sides. A magnetic bin 4-13-5 with a rectangular cavity and an opening at one end is provided in the center of the grid frame 4-13-2, which is used to install a permanent magnet 4-13-6. The permanent magnet 4-13-6 can be a third-generation samarium cobalt permanent magnet or a neodymium iron boron permanent magnet. The external dimensions of the permanent magnet 4-13-6 are 70mm×45mm×20mm. The oriented magnetization process is adopted to concentrate and increase the magnetic force on one side, and the outer surface is electroplated for protection.

[0065] The permanent magnet is encapsulated above a plurality of arc-extinguishing grids 4-13-3, and the effective orientation magnetic field completely covers the arc-generating area of ​​the switch blade. When the switch generates an arc when breaking the circuit, the arc is pulled into the arc-extinguishing grid 4-13-3 under the contraction force of the magnetic force line. The orientation strong magnet of the permanent magnet is N polarity, and the charged arc electron ion flow is accelerated to move toward the arc-extinguishing grid 4-13-3 under the action of the magnetic field force, and enters the arc-extinguishing grid 4-13-3 arranged at a certain distance. The long arc is divided into a plurality of short arcs by the plurality of arc-extinguishing grids 4-13-3, and the voltage of each short arc is rapidly reduced until it is extinguished and no longer reignites. In the present invention, the permanent magnet constrains the arc electron ion flow under the action of the electromagnetic force and moves it toward the inside of the arc-extinguishing grid 4-13-3, thereby improving the arc-extinguishing efficiency and the safety of the equipment.

[0066] In this embodiment, the three-phase fuses 8 are respectively installed in three corresponding holes below the front plate of the mechanism chamber 12 and sealed by O-rings. Figure 8 As shown, the three-phase fuses in the present invention are installed in the switch cabinet in a herringbone arrangement, divided into three phases A, B, and C. The conductive ends are connected to the three phases of the three-phase magnetic blow-out load switch 4 through the upper part of the copper busbar, and are connected to the three-phase bottom insulating sleeve 3 below. The compact structure effectively improves the space utilization rate in the switch cabinet, and the switch cabinet can be miniaturized.

[0067] Combination Fig. 9 , 10As shown in Figures 1 and 12, in the present invention, the fuse striker tripping mechanism 7 includes a mechanism frame 7-1, which is fixedly mounted on the outer side of the front plate of the fuse chamber 14. A mounting hole corresponding to the position of the three-phase fuse 8 is arranged on the mechanism frame 7-1, and a striker mechanism top cover 7-2 is arranged on the mounting hole. An insulating silicone cone 7-3 is arranged between the striker mechanism top cover 7-2 and the mounting hole. A striker insulating cylinder 7-4 is arranged in the inner hole of the insulating silicone cone 7-3. A striker rod 7-5 is installed in the center of the striker insulating cylinder 7-4. The striker rod 7-5 can slide up and down, and its top end is directly opposite to the striker machine tripping rotating plate 7-6. One end of the striker machine tripping rotating plate 7-6 is clamped on the striker mechanism top cover 7-2, and the other end is connected to the tripping rotating plate 7-6 through the first connecting rod 7-7. The locking rotating rod 7-8 is connected, and a pair of tripping rotating rods 7-8 are arranged, and are respectively located on both sides of the three-phase fuse 8. When one of the fuses is blown, the thrust generated at its tail end is sufficient to pop out the striker rod 7-5, and the popped-out striker rod 7-5 hits the striker machine tripping rotating plate 7-6. After the striker machine tripping rotating plate 7-6 rotates, it presses down the tripping rotating rod 7-8 to rotate it. The top end of the tripping rotating rod 7-8 is connected to the tripping indicator 7-10 through the second connecting rod 7-9, causing its position to shift. The front end of the tripping indicator 7-10 is connected to the tripping cable 7-11, and the tripping cable 7-11 is connected to the driving component of the operating mechanism 5 of the load switch, and is used to drive the three-phase magnetic blow load switch 4 to open the switch.

[0068] like Fig.11 As shown, it is a schematic diagram of the overall structure of the small grounding switch of the fuse of the present invention. The small grounding switch 8 of the fuse includes a grounding mounting frame 8-1 and a grounding square shaft 8-2. The grounding mounting frame 8-1 is formed by deep drawing of steel plate blanking, and the surface is galvanized for protection, and various components are assembled and installed thereon. The two ends of the grounding square shaft 8-2 are assembled in the rotating shaft holes on both sides of the grounding mounting frame 8-1. Three grounding contacts 8-3 are arranged at equal intervals on the grounding square shaft 8-2. The grounding contacts 8-3 are made of red copper and the surface is silver-plated. The support sleeve is installed in the U-shaped mouth of the grounding contact 6-7 and fastened with a long-necked screw. One end of the grounding square shaft 8-2 is movably connected to the front end of the driven crank arm 8-4, and the other end is connected to the grounding connection row 8-5. The end of the driven crank arm 8-4 is movably connected to the front end of the transmission connecting rod 8-6. The end of the transmission connecting rod 8-6 is connected to the bottom angle of one side of the triangular active rotating plate 8-7, the top of the triangular active rotating plate 8-7 is rotatably connected to the rotating hole at the top of the grounding mounting frame 8-1, and the bottom angle of the other side of the triangular active rotating plate 8-7 is connected to the bottom of the grounding pull rod 8-1. The top of the grounding pull rod 8-1 is rotatably connected to the insulating main shaft 4-1 of the three-phase magnetic blowout load switch through a crank arm, so that when the three-phase magnetic blowout load switch 4 is grounded, the small fuse grounding switch 8 is synchronously opened and closed with it, realizing the opening and closing grounding operation on both sides of the three-phase fuse.

[0069] In addition, if Fig.12As shown, the side chamber of the cabinet 1 in the present invention is made of 304 stainless steel sheet material, laser cutting, CNC bending and processing, and assembled and welded by precision argon arc welding. The connection of each hole position is processed by high-speed polishing and grinding, and O-rings are installed and coated with aviation-grade corrosion-resistant and long-life insulating silicone grease for sealing. Fireproof high-pressure laminated plates 15 are installed on the left, right, back and top of the inner wall of the cabinet 1 to prevent the arc inside the air chamber caused by the circuit fault on the inlet and outlet side, and the high-temperature and high-pressure flame smoke from burning and spraying the left, right, front and top surfaces of the air chamber. Reinforced bevel ribs 16 are installed at the angles of each surface inside the cabinet 1 to ensure that the air chamber will not be deformed or exploded under the strong pressure airflow caused by the internal fault arc, so as to ensure the personal and property safety of the power supply site. A circular high-pressure explosion relief device 17 is designed at the bottom. The explosion relief device is sealed and installed with a corrosion-resistant O-ring coated with aviation-grade corrosion-resistant and long-life insulating silicone grease. A stainless steel metal explosion relief membrane is installed inside the explosion relief device. When the air pressure value of the air chamber is greater than a certain multiple of the rated operating air pressure value or the air chamber produces a fault arc and high-pressure flame smoke, the metal explosion relief membrane can be destroyed, and the high-pressure airflow or flame smoke is discharged to the bottom cable compartment. The design and installation position of the explosion relief device is concentric with the pressure relief channel of the bottom cable compartment, and the high-pressure airflow or flame smoke can be directly discharged to the pressure relief channel of the bottom cable compartment, and then discharged to the underground cable trench, so as to ensure the personal and property safety of the power supply site. The cable bin door frame of the present invention adopts a labyrinth structure design, which can prevent the high-temperature and high-pressure flame smoke from rushing out of the cable bin door caused by arcing in the cable bin due to circuit faults on the inlet and outlet sides; a fire-proof high-pressure laminated plate is installed on the inner side of the cable bin door, and a dustpan-type guide plate is installed on the laminated plate. The guide plate can return the flame smoke rushing toward the cable bin door back to the cable bin chamber; there is only one pressure relief channel at the rear bottom of the cable bin chamber, and the pressure relief channel is designed toward the bottom surface; a corrosion-resistant rubber sealing plate is installed at the channel opening to isolate the invasion of external sand, dust and water vapor; at the same time, when arcing occurs in the cable bin chamber, the rubber sealing plate is instantly burned by the flame smoke, and the high-temperature and high-pressure flame smoke is discharged from the cable bin chamber through the pressure relief channel and enters the underground cable trench, thereby protecting ground equipment and personnel from harm.

[0070] In summary, the switch cabinet with a magnetic blowout load switch designed by the present invention increases the strong magnetic field through the magnetic blowout arc extinguishing component to directional drain and concentrate the arc electron ions, and then quickly cuts the arc and extinguishes the arc through the arc extinguishing device, effectively improving the arc extinguishing ability of the load switch, and solving the technical problem of low arc extinguishing ability of the load switch in the high-voltage load switch cabinet. The switch cabinet with a magnetic blowout load switch designed by the present invention arranges the three-phase fuses in a compact triangular shape, and arranges the components such as the switch mechanism in a compact and reasonable manner, which significantly improves the space utilization rate in the cabinet. The switch cabinet with a magnetic blowout load switch of the present invention provides a small fuse grounding switch at the lower end of the fuse to ground the load side of the fuse to avoid accidents and improve the protection level of the switch cabinet.

[0071] The above embodiments are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A switch cabinet with a magnetic blow load switch, characterized in that: comprising a cabinet (1); The cabinet (1) is provided with a cable compartment (11), a mechanism compartment (12), a closed air compartment (13) and a fuse compartment (14); in, The fuse chamber (14) is installed at the upper rear of the cable compartment (11); The closed air chamber (13) is installed above the fuse chamber (14); The mechanism chamber (12) is installed above the cable compartment (11) and is located in front of the fuse chamber (14) and the closed air chamber (13); A three-phase top insulating sleeve (2) is arranged on the top of the closed air chamber (13); A three-phase bottom insulating sleeve (3) is arranged at the bottom of the fuse chamber (14); The three-phase bottom insulating sleeve (3) penetrates into the cable compartment (11) to connect the incoming and outgoing cables; A three-phase magnetic blowout load switch (4) is installed in the closed air chamber (13); The three-phase top insulating sleeves (2) are respectively connected to the top of the three-phase magnetic blowout load switch (4) through copper busbars; An operating mechanism (5) of a load switch is installed above the mechanism room (12); The operating mechanism (5) of the load switch is located outside the front plate of the closed air chamber (13) and is connected to the insulating main shaft (4-1) of the three-phase magnetic blowout load switch (4) through a driving component; A three-phase fuse (6) is arranged in the fuse chamber (14); The three-phase fuses (6) are arranged in a herringbone shape; The bottom of the three-phase magnetic blow-out load switch (4) is connected to the conductive terminal in the middle of the three-phase fuse (6) through three copper busbars; The bottom of the three-phase fuse (6) is connected to the three-phase bottom insulating sleeve (3) through a copper busbar; A fuse striker release mechanism (7) is installed at the lower part of the mechanism chamber (12); The fuse striker tripping mechanism (7) is connected to the operating mechanism (5) of the load switch via a tripping cable (7-11), and the fuse striker tripping mechanism (7) is correspondingly mounted on the front of the three-phase fuse (6) and fastened to the outer side of the front plate of the fuse chamber (14), and is used to transmit an action signal to the operating mechanism (5) of the load switch when the three-phase fuse (6) is blown, so that the operating mechanism (5) of the load switch drives the three-phase magnetic blow load switch (4) to perform a tripping action; A small fuse grounding switch (8) is also installed in the fuse chamber (14); The small fuse grounding switch (8) is located at the inner bottom of the fuse chamber (14); The small fuse grounding switch (8) is connected to the insulating main shaft (4-1) of the three-phase magnetic blow-out load switch (4) through the grounding pull rod (8-8). When the insulating main shaft (4-1) rotates to the three-phase magnetic blow-out load switch (4) to perform a grounding closing operation, the three copper busbars between the three-phase fuse (6) and the three-phase bottom insulating sleeve (3) are short-circuited to ground; The three-phase magnetic blow load switch (4) also includes a switch mounting frame (4-2); a top crossbeam (4-3) and a lower crossbeam (4-4) arranged in parallel are installed behind the switch mounting frame (4-2); the insulating main shaft (4-1) is arranged in parallel between the top crossbeam (4-3) and the lower crossbeam (4-4); the rear end of the insulating main shaft (4-1) is connected to one end of the switch mounting frame (4-2) through a bearing, and the front end of the insulating main shaft (4-1) passes through the switch mounting frame. The corresponding hole at the other end of the mounting frame (4-2) is connected to the operating mechanism (5) of the load switch; a grounding beam (4-5) is installed in front of the switch mounting frame (4-2), and a grounding bus (4-6) is installed on the grounding beam (4-5); three grounding contacts (4-7) are arranged at intervals on the grounding bus (4-6); three upper epoxy insulators (4-8) are installed at equal intervals on the top crossbeam (4-3); and three lower epoxy insulators (4-8) are installed at equal intervals on the lower crossbeam (4-4). insulator (4-9); the upper epoxy insulator (4-8) and the lower epoxy insulator (4-9) are arranged in an aligned manner, and a static contact connection row (4-10) is arranged on the upper epoxy insulator (4-8); a moving contact connection row (4-11) is installed on the lower epoxy insulator (4-9); a static contact (4-12) is installed on the static contact connection row (4-10); a magnetic blow-out arc assembly (4-13) is installed on the top of the static contact (4-12); the magnetic blow-out arc assembly (4-13) is inclined downward The insulating main shaft (4-1) is inclined and forms a certain inclination angle with the end face of the static contact (4-12); three insulating arms (4-14) are fixedly arranged at equal intervals on the insulating main shaft (4-1); the front end of the insulating arm (4-14) is connected to the insulating pull rod (4-15); the front end of the insulating pull rod (4-15) is provided with a moving contact knife sleeve (4-16); the moving contact connection row (4-11) is connected to the end pin shaft of the moving contact assembly; the front end of the moving contact assembly is sleeved in the moving contact knife sleeve (4-16); The moving contact assembly comprises a pair of moving blades (4-17) arranged in parallel; a distance metal support sleeve is arranged between the pair of moving blades (4-17) so that a U-shaped space for clamping the stationary contact (4-12) is formed between the two. The magnetic blowout arc extinguishing assembly (4-13) comprises a plastic mold frame; the plastic mold frame comprises a grid frame head (4-13-1) and a grid frame body (4-13-2); the grid frame head (4-13-2) is fixed to the top of the static contact (4-12) by bolts; a plurality of grid plate slots are sequentially provided on the lower side of the grid frame body (4-13-2) for correspondingly installing a plurality of arc extinguishing grid plates (4-13-3); each arc extinguishing grid plate (4-13-3) is generally in an H-shape with a narrow upper portion and a wide lower portion; the upper narrow opening of the arc extinguishing grid plate (4-13-3) is a U-shaped snap-on opening for matching and snapping into the grid plate slot; an inverted U-shaped arc guiding channel (4-13-4) is stamped on three sides of the lower wide opening of the arc extinguishing grid plate (4-13-3); a magnetic bin (4-13-5) with a rectangular cavity and an opening at one end is provided in the center of the grid frame body (4-13-2) for installing a permanent magnet (4-13-6); The three-phase fuses (8) are respectively installed in three corresponding holes below the front plate of the mechanism chamber (12) and are sealed by O-rings; The fuse striker release mechanism (7) comprises a mechanism frame (7-1), the mechanism frame (7-1) being fixedly mounted on the outer side of the front plate of the fuse chamber (14); a mounting hole corresponding to the position of the three-phase fuse (8) is arranged on the mechanism frame (7-1); a striker mechanism top cover (7-2) is arranged on the mounting hole; an insulating silicone cone (7-3) is arranged between the striker mechanism top cover (7-2) and the mounting hole; a striker insulating cylinder (7-4) is arranged in the inner hole of the insulating silicone cone (7-3); a striker rod (7-5) is mounted at the center of the striker insulating cylinder (7-4); the striker rod (7-5) can slide up and down, and its top end is directly opposite to the striker machine release rotating plate (7-6); one end of the striker machine release rotating plate (7-6) is clamped on the striker mechanism top cover (7-2); the other end is connected to the release rotating plate (7-6) through a first connecting rod (7-7) The tripping rotating rod (7-8) is connected; a pair of the tripping rotating rods (7-8) are provided and are respectively located on both sides of the three-phase fuse (8); when one of the fuses is blown, the thrust generated at its tail end is sufficient to eject the striker rod (7-5), and the ejected striker rod (7-5) strikes the striker machine tripping rotating plate (7-6), and the striker machine tripping rotating plate (7-6) rotates and then presses down the tripping rotating rod (7-8) to rotate it, and the top end of the tripping rotating rod (7-8) is connected to the tripping indicator (7-10) through the second connecting rod (7-9) to cause the position to shift, and the front end of the tripping indicator (7-10) is connected to the tripping cable (7-11), and the tripping cable (7-11) is connected to the driving component of the operating mechanism (5) of the load switch, and is used to drive the three-phase magnetic blow load switch (4) to open.

2. The switch cabinet with magnetic blow load switch according to claim 1 is characterized in that: The small fuse grounding switch (8) comprises a grounding mounting frame (8-1) and a grounding square shaft (8-2); two ends of the grounding square shaft (8-2) are mounted in rotating shaft holes on two sides of the grounding mounting frame (8-1); three grounding contacts (8-3) are arranged at equal intervals on the grounding square shaft (8-2); one end of the grounding square shaft (8-2) is movably connected to the front end of a driven crank arm (8-4); the other end is connected to a grounding connection row (8-5); the end of the driven crank arm (8-4) is connected to the ... The driving connecting rod (8-6) is movably connected to the front end thereof; the end of the driving connecting rod (8-6) is connected to the bottom angle of one side of the triangular active rotating plate (8-7); the top end of the triangular active rotating plate (8-7) is rotatably connected to the rotating hole at the top end of the grounding mounting frame (8-1); the bottom angle of the other side of the triangular active rotating plate (8-7) is connected to the bottom of the grounding pull rod (8-8); the top end of the grounding pull rod (8-1) is rotatably connected to the insulating main shaft (4-1) of the three-phase magnetic blowout load switch via a crank arm.

3. The switch cabinet with magnetic blow load switch according to claim 2 is characterized in that: The inner wall of the cabinet (1) is provided with a fireproof high-pressure laminated board (15); reinforcing beveled ribs (16) are installed at the angles of each surface of the inner wall of the cabinet (1); a circular high-pressure explosion relief device (17) is arranged at the bottom of the cabinet (1); and a high-temperature resistant, moisture-absorbing and fireproof sponge is attached to the gap between the inner overlapping surfaces of the cabinet (1).

4. The switch cabinet with magnetic blow load switch according to claim 3 is characterized in that: A cable compartment door is arranged on the front of the cable compartment (11); a load mechanism operation panel is arranged on the front of the mechanism chamber (12); a grounding switch on / off indication and a load switch on / off indication are provided on the load mechanism operation panel; and a fuse compartment panel is arranged on the front of the fuse chamber (14).

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