Switchgear cabinet with magnetic blow-out load switch

Abstract

Disclosed is a switchgear cabinet with a magnetic blow-out load switch, comprising a cabinet body, wherein a cable compartment, a mechanism compartment, a sealed gas compartment, and a fuse compartment are arranged within the cabinet body. A three-phase top insulating sleeve is arranged at the top of the sealed gas compartment, a three-phase bottom insulating sleeve is arranged at the bottom of the fuse compartment, and the three-phase bottom insulating sleeve penetrates into the cable compartment to connect to an incoming cable and an outgoing cable. A three-phase magnetic blow-out load switch is installed within the sealed gas compartment, and an operating mechanism for the load switch is installed at an upper part within the mechanism compartment and located on an outer side of a front panel of the sealed gas compartment. A three-phase fuse is arranged within the fuse compartment, a fuse striker-pin tripping mechanism is installed at a bottom part within the mechanism compartment, and a small fuse grounding switch is further installed within the fuse compartment. The present invention uses a magnetic blow-out arc extinguishing assembly to increase a strong magnetic field to directionally guide and concentrate electrons and ions of an electric arc, and performs rapid arc interruption and arc extinguishing by means of an arc extinguishing apparatus, effectively improving the arc extinguishing capacity of the load switch, and solving the technical problem of load switches in high-voltage load switch cabinets having low arc extinguishing capacity.

Description

Switch cabinet with magnetic blow load switch TECHNICAL FIELD

[0001] The present application relates to the technical field of switch cabinets, in particular to a switch cabinet with a magnetic blow load switch. BACKGROUND

[0002] The arc extinguishing capacity of the load switch of the conventional switch cabinet with a load switch directly determines the operation safety and reliability of the high-voltage switch device. With the continuous development of the high-voltage power distribution field, better safety and reliability of the performance of the high-voltage switch cabinet is required, and the arc extinguishing capacity of the load switch needs to be further improved. The conventional high-voltage switch cabinet usually adopts an arc rod and a gas blow structure to realize arc extinguishing of the load switch for breaking the high-voltage circuit, which has high cost, large size, limited arc extinguishing efficiency, low reliability, short service life, and cannot meet the demand of the power distribution network and ensure the personal safety of the operation and maintenance personnel. In addition, the arrangement of the three-phase fuses of the conventional high-voltage switch cabinet is usually horizontal or vertical, which causes waste of land resources. The conventional high-voltage switch cabinet has few electrical mechanical locking functions, which has safety hazards for the operation and maintenance personnel. The conventional high-voltage switch cabinet has low protection level and cannot be applied to the power distribution network scene in severe climate. SUMMARY

[0003] To solve the technical problems mentioned in the background, the present application provides a switch cabinet with a magnetic blow load switch.

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

[0005] The cabinet body is arranged with a cable compartment, a mechanism chamber, a closed gas chamber and a fuse chamber;

[0006] Among them,

[0007] The fuse chamber is installed above the back of 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] The closed gas chamber is arranged with three-phase top insulation sleeves at the top;

[0011] The fuse chamber is arranged with three-phase bottom insulation sleeves at the bottom;

[0012] The three-phase bottom insulation sleeves are connected to the incoming and outgoing line cables through the cable compartment;

[0013] The closed gas chamber is installed with three-phase magnetic blow load switches;

[0014] The three-phase top insulation sleeve is connected with the top end of the three-phase magnetic blow load switch through copper busbars respectively.

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

[0016] The operating mechanism of the load switch is located outside the front plate of the closed gas chamber and is connected with the insulation main shaft of the three-phase magnetic blow load switch through the driving component;

[0017] The three-phase fuses are arranged in the fuse chamber;

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

[0019] The bottom of the three-phase magnetic blow load switch is connected with the conductive terminals in the middle of the three-phase fuse barrel through three copper busbars for conduction;

[0020] The bottom of the three-phase fuse barrel is connected with the three-phase bottom insulation sleeve through copper busbars for conduction;

[0021] The fuse plunger tripping mechanism is installed below the mechanism chamber;

[0022] The fuse plunger tripping mechanism is connected with the operating mechanism of the load switch through a tripping cable, and is installed on the front of the three-phase fuse and is fastened on the outside of the front plate of the fuse chamber, for transmitting an action signal to the operating mechanism of the load switch when the three-phase fuse is fused, so that the operating mechanism of the load switch drives the three-phase magnetic blow load switch to perform a tripping action;

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

[0024] The fuse small grounding switch is located at the bottom of the inside of the fuse chamber;

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

[0026] Further, the three-phase magnetic blow load switch comprises a switch mounting frame; a top beam and a lower beam are arranged in parallel at the back 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 with one end of the switch mounting frame through a bearing, and the front end of the insulating main shaft is connected with the operating mechanism of the load switch by penetrating through the corresponding hole of the other end of the switch mounting frame; a grounding beam is arranged at the front of the switch mounting frame, and a grounding busbar is arranged on the grounding beam; three grounding contacts are arranged on the grounding busbar at intervals; three upper epoxy insulators are arranged on the top beam at intervals; three lower epoxy insulators are arranged on the lower beam at intervals; the upper epoxy insulators and the lower epoxy insulators are arranged in alignment, and a static contact connecting row is arranged on the upper epoxy insulator; a dynamic contact connecting row is arranged on the lower epoxy insulator; a static contact is arranged on the static contact connecting row; the magnetic blow arc extinguishing assembly is assembled at the top end of the static contact; the magnetic blow arc extinguishing assembly is inclined downward and forms a certain inclination angle with the end face of the static contact; three insulating crank arms are fixed on the insulating main shaft at intervals; an insulating pull rod is connected with the front end of the insulating crank arm; a dynamic contact knife sleeve is arranged at the front end of the insulating pull rod; the dynamic contact connecting row is connected with the end pin of the dynamic contact assembly; and the front end of the dynamic contact assembly is sleeved in the dynamic contact knife sleeve.

[0027] Further, the dynamic contact assembly comprises a pair of parallel arranged dynamic blades; a distance maintaining metal support sleeve is arranged between the pair of dynamic blades to form a U-shaped space for clamping the static contact.

[0028] Further, the magnetic blow arc extinguishing assembly comprises a plastic mold frame; the plastic mold frame comprises a grid frame head and a grid frame body; the grid frame head is fixed on the top end of the static contact through bolts; a plurality of grid piece notches are sequentially arranged on the lower side of the grid frame body for corresponding installation of a plurality of arc extinguishing grid pieces; each arc extinguishing grid piece is in the shape of H with the upper part being narrow and the lower part being wide, the upper narrow part of the arc extinguishing grid piece is a U-shaped clamping port for being clamped in the grid piece notch; the lower wide part of the arc extinguishing grid piece is provided with a reverse U-shaped arc guiding channel on three sides; a magnetic chamber with a rectangular cavity is arranged in the center of the grid frame body, and a permanent magnet is arranged in the magnetic chamber.

[0029] Further, the three-phase fuses are respectively arranged in three corresponding hole positions below the front plate of the mechanism chamber, and are sealed by O-shaped sealing rings.

[0030] Further, the fuse striker tripping mechanism comprises a mechanism frame fixedly installed outside the fuse chamber front plate; the mechanism frame is provided with mounting holes corresponding to the positions of the three-phase fuses; a striker mechanism top cover is arranged on the mounting holes; an insulating silica gel cone is arranged between the striker mechanism top cover and the mounting holes; a striker insulating cylinder is arranged in the insulating silica gel cone; a striker rod is installed at the center of the striker insulating cylinder; the striker rod can slide up and down, and the top end of the striker rod is opposite to a striker mechanism tripping rotating plate; one end of the striker mechanism tripping rotating plate is clamped on the striker mechanism top cover; the other end is connected with a tripping rotating rod through a first connecting rod; the tripping rotating rod is provided with a pair of tripping rotating rods, and is arranged on the two sides of the three-phase fuses; when one of the fuses is fused, the thrust generated at the tail end of the fuse is sufficient to pop out the striker rod; the popped-out striker rod hits the striker mechanism tripping rotating plate; the striker mechanism tripping rotating plate rotates and presses down the tripping rotating rod to make it rotate; the top end of the tripping rotating rod is connected with a tripping indicator through a second connecting rod, so that the tripping indicator is deviated; the front end of the tripping indicator is connected with a tripping cable; the tripping cable is connected with a driving part of an operating mechanism of the load switch, and is used to drive the three-phase magnetic blow load switch to be tripped.

[0031] Further, the fuse small grounding switch comprises a grounding mounting rack and a grounding four-square shaft; the two ends of the grounding four-square shaft are assembled in rotating shaft holes on the two sides of the grounding mounting rack; three grounding contacts are arranged on the grounding four-square shaft at equal intervals; one end of the grounding four-square shaft is movably connected with the front end of a driven crank arm; the other end of the grounding four-square shaft is connected with a grounding connecting row; the tail end of the driven crank arm is movably connected with the front end of a transmission connecting rod; the tail end of the transmission connecting rod is connected with one side of a bottom corner of a triangular driving rotating plate; the top end of the triangular driving rotating plate is rotatably connected with a rotating hole at the top end of the grounding mounting rack; the other side of the bottom corner of the triangular driving rotating plate is connected with the bottom of a grounding pull rod; the top end of the grounding pull rod is rotatably connected with an insulating main shaft of the three-phase magnetic blow load switch through a crank arm.

[0032] Further, the inner wall of the cabinet is provided with a fireproof high-pressure laminated board; reinforcing inclined angle ribs are installed at the corners of each surface of the inner wall of the cabinet; a circular high-pressure explosion venting device is arranged at the bottom of the cabinet; high-temperature-resistant moisture-absorbing fireproof sponges are attached to the clamping seams of the inner lap joints of the cabinet.

[0033] Further, the front surface of the cable bin is provided with a cable bin door; the front surface of the mechanism chamber is provided with a load mechanism operation panel; the load mechanism operation panel is provided with grounding switch opening and closing indicators and load switch opening and closing indicators; the front surface of the fuse chamber is provided with a fuse bin panel.

[0034] Compared with the prior art, the switch cabinet with the magnetic blow load switch has the advantages that: the magnetic blow arc extinguishing assembly is arranged to increase the strong magnetic field to direct the flow of arc electrons and ions and concentrate them, and then the arc extinguishing device is used to quickly cut and extinguish the arc, so that the arc extinguishing capacity of the load switch is effectively improved, and the technical problem of low arc extinguishing capacity of the load switch in the high-voltage load switch cabinet is solved.

[0035] The switch cabinet with magnetic blow load switch designed by the application arranges three-phase fuses in a compact triangle shape, and compactly and reasonably arranges switch mechanisms and other components, thereby significantly improving the space utilization rate in the cabinet.

[0036] The switch cabinet with magnetic blow load switch of the application sets a small fuse grounding switch at the lower end of the fuse to ground the load side of the fuse, thereby avoiding accidents and improving the protection level of the switch cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0037] Fig. 1 is a front view of the switch cabinet with magnetic blow load switch of the application;

[0038] Fig. 2 is an A-A view of Fig. 1;

[0039] Fig. 3 is a schematic view of the overall structure of the three-phase magnetic blow load switch of the application;

[0040] Fig. 4 is a front view of the three-phase magnetic blow load switch of the application;

[0041] Fig. 5 is a side view of the three-phase magnetic blow load switch of the application;

[0042] Fig. 6 is a schematic view of the overall structure of the magnetic blow arc extinguishing assembly of the application;

[0043] Fig. 7 is a front sectional view of the magnetic blow arc extinguishing assembly of the application;

[0044] Fig. 8 is a schematic view of the overall structure of the three-phase fuse of the application;

[0045] Fig. 9 is a schematic view of the overall structure of the fuse plunger tripping mechanism of the application;

[0046] Fig. 10 is an A-A view of Fig. 9;

[0047] Fig. 11 is a schematic view of the overall structure of the small fuse grounding switch of the application;

[0048] Fig. 12 is a schematic view of the overall structure of the cabinet body of the application.

[0049] Wherein:

[0050] 1-cabinet body, 2-three-phase top insulation sleeve, 3-three-phase bottom insulation sleeve, 4-three-phase magnetic blow load switch, 5-operation mechanism of the load switch, 6-three-phase fuse, 7-fuse plunger tripping mechanism, 8-small fuse grounding switch,

[0051] 11-cable compartment, 12-mechanism chamber, 13-closed gas chamber, 14-fuse chamber, 15-fireproof high-pressure laminated board, 16-reinforcing bevel rib, 17-circular high-pressure explosion venting device, 18-cable compartment door, 19-load mechanism operation panel, 20-fuse compartment panel,

[0052] 4-1-insulated main shaft, 4-2-switch mounting bracket, 4-3-top cross beam, 4-4-lower cross beam, 4-5-ground beam, 4-6-ground busbar, 4-7-ground contact, 4-8-upper epoxy insulator, 4-9-lower epoxy insulator, 4-10-static contact connecting row, 4-11-moving contact connecting row, 4-12-static contact, 4-13-magnetic arc extinguishing assembly, 4-14-insulated crank, 4-15-insulated pull rod, 4-16-moving contact knife sleeve, 4-17-moving knife blade,

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

[0054] 7-1-mechanism frame, 7-2-needle mechanism top cover, 7-3-insulating silica gel vertebra, 7-4-needle insulating cylinder, 7-5-needle rod, 7-6-needle mechanism tripping rotating plate, 7-7-first connecting rod, 7-8-tripping rotating rod, 7-9-second connecting rod, 7-10-tripping trip indicator, 7-11-tripping pull cable,

[0055] 8-1-ground mounting bracket, 8-2-ground square shaft, 8-3-ground contact, 8-4-driven crank, 8-5-ground connecting row, 8-6-transmission connecting rod, 8-7-triangle driven rotating plate, 8-8-ground pull rod. DETAILED DESCRIPTION

[0056] In the following, for the convenience of those skilled in the art to understand the technical scheme of the present application, further description will be made 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 application.

[0057] In the following detailed description, for the convenience of explanation, many specific details are set forth in order to provide a comprehensive understanding of embodiments of the present application. However, it is obvious that one or more embodiments can be implemented without these specific details. In addition, in the following description, the description of well-known structures and techniques is omitted to avoid unnecessary confusion of the concept of the present application.

[0058] Please combine the drawings shown in Figures 1-2, the switch cabinet with magnetic blow load switch designed in the application comprises a cabinet body 1, wherein a cable compartment 11, a mechanism chamber 12, a closed gas chamber 13 and a fuse chamber 14 are arranged in the cabinet body 1, the fuse chamber 14 is installed at the upper rear of the cable compartment 11 and fastened by screws. The closed gas chamber 13 is installed above the fuse chamber 14, the mechanism chamber 12 is installed above the cable compartment 11 and located in front of the fuse chamber 14 and the closed gas chamber 13, and fastened by screws. A three-phase top insulation sleeve 2 is arranged at the top of the closed gas chamber 13, and a three-phase bottom insulation sleeve 3 is arranged at the bottom of the fuse chamber 14 and penetrates into the cable compartment 11 to connect the incoming and outgoing line cables. In 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 the load mechanism operation panel 19 is provided with a gas pressure gauge, a grounding switch opening and closing indicator and a load switch opening and closing indicator; a fuse compartment panel 20 is arranged on the front of the fuse chamber 14.

[0059] As shown in Figure 2, a three-phase magnetic blow load switch 4 is installed in the closed gas chamber 13 and installed on the inner side of the front plate of the closed gas chamber 13. The three-phase top insulation sleeve 2 is connected to the top end of the three-phase magnetic blow load switch 4 through copper busbars respectively. A load switch operating mechanism 5 is installed above the mechanism chamber 12, located on the outer side of the front plate of the closed gas chamber 13 and connected to an insulation main shaft 4-1 of the three-phase magnetic blow load switch 4 through a driving part and a sealing shaft sleeve. A three-phase fuse 6 is arranged in the fuse chamber 14 and arranged in a triangular shape. The bottom of the three-phase magnetic blow load switch 4 is connected to the conductive terminals of the middle part of the barrel of the three-phase fuse 6 through three copper busbar rods. The barrel bottom of the three-phase fuse 6 is connected to the three-phase bottom insulation sleeve 3 through copper busbars. A high-voltage fuse is installed in the three-phase fuse 8. The high-voltage fuse connects and conducts the conductive terminals of the barrel and the barrel bottom of the three-phase fuse. At this time, three complete power supply lines are formed between the three-phase top insulation sleeve 2 and the three-phase bottom insulation sleeve 3.

[0060] In addition, in the embodiment, a fuse striker release mechanism 7 is installed below the inside of the mechanism chamber 12. The fuse striker release mechanism 7 is connected to the load switch operating mechanism 5 through a release cable 7-11 and installed on the front of the three-phase fuse 6, fastened on the outer side of the front plate of the fuse chamber 14 and used for transmitting an action signal to the load switch operating mechanism 5 when the three-phase fuse 6 is fused, so that the load switch operating mechanism 5 drives the three-phase magnetic blow load switch 4 to perform a tripping action when the fuse is fused.

[0061] The fuse chamber 14 is also provided with a fuse small grounding switch 8, which is located at the inner bottom of the fuse chamber 14. The fuse small grounding switch 8 is connected with the insulated main shaft 4-1 of the three-phase magnetic blow load switch 4 through a grounding pull rod 8-8, which in turn links the fuse small grounding switch 8 to act, and when the insulated main shaft 4-1 is rotated to the three-phase magnetic blow load switch 4 for grounding closing operation, the three copper busbars between the three-phase fuse 6 and the three-phase bottom insulation sleeve 3 are short-circuited and grounded. The fuse small grounding switch 8 is connected with the air chamber shell, which is connected with the 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, at which time the two sides of the three-phase fuse 8 are grounded, facilitating the safe inspection and replacement of the internal high-voltage fuse.

[0062] As shown in FIGS. 3-5, the three-phase magnetic blow load switch 4 designed by the present application further comprises a switch mounting frame 4-2. The switch mounting frame is punched and sheared from high-strength steel material and is formed by precise argon arc welding. A top cross beam 4-3 and a lower cross beam 4-4 are installed in parallel at the rear of the switch mounting frame 4-2, an insulation main shaft 4-1 is arranged in parallel between the top cross beam 4-3 and the lower cross beam 4-4, the tail end of the insulation main shaft 4-1 is connected to one end of the switch mounting frame 4-2 through a bearing, the front end of the insulation main shaft 4-1 is connected to the operating mechanism 5 of the load switch through the corresponding hole of the other end of the switch mounting frame 4-2, a grounding beam 4-5 is installed at the front of the switch mounting frame 4-2, a grounding bus bar 4-6 is installed on the grounding beam 4-5, three grounding contacts 4-7 are arranged in parallel on the grounding bus bar 4-6, three upper epoxy insulators 4-8 are installed at equal intervals on the top cross beam 4-3, and three lower epoxy insulators 4-9 are installed at equal intervals on the lower cross beam 4-4. The upper epoxy insulators 4-8 and the lower epoxy insulators 4-9 are arranged in alignment. The upper epoxy insulators 4-8 and the lower epoxy insulators 4-9 are integrally poured by using epoxy material with high insulation performance and high crack resistance. A static contact connecting row 4-10 is arranged on the upper epoxy insulator 4-8, a moving contact connecting row 4-11 is installed on the lower epoxy insulator 4-9, a static contact 4-12 is installed on the static contact connecting row 4-10, and the static contact connecting row and the static contact are both pressure cast from purple copper row and are treated by surface silver plating. A magnetic blow arc extinguishing assembly 4-13 is assembled at the top end of the static contact 4-12, the magnetic blow arc extinguishing assembly 4-13 is downwardly inclined and forms a certain inclination angle with the end face of the static contact 4-12, three insulation crank arms 4-14 are fixedly arranged at equal intervals on the insulation main shaft 4-1, an insulation pull rod 4-15 is connected to the front end of the insulation crank arm 4-14, a moving contact knife sleeve 4-16 is arranged at the front end of the insulation pull rod 4-15, and the moving contact connecting 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 parallel arranged moving blades 4-17, which are pressure cast from purple copper row and are treated by surface silver plating. A fixed distance metal support sleeve is arranged between the pair of moving blades 4-17 to form a U-shaped space for clamping the static contact 4-12 between the moving blades 4-17.

[0063] Specifically, when the three-phase magnetic blow load switch 4 is used, the insulation main shaft 4-1 is rotated under the drive of the operating mechanism 5 of the load switch, the moving contact assembly is rotated to be in pressure contact with the static contact 4-12, isolation closing is realized, and the circuit is turned on. Under the drive of the operating mechanism 5 of the load switch, the insulation main shaft 4-1 is rotated to drive the moving contact assembly to be separated from the static contact 4-12, isolation opening is realized, and the circuit is turned off. Under the drive of the mechanism, the insulation main shaft 4-1 is rotated to drive the moving contact assembly to be in pressure contact with the grounding contact 4-7, grounding closing is realized, and the circuit is grounded. The operating mechanism 5 of the load switch involved in the present embodiment is a conventional technical means, which will not be described here.

[0064] As shown in Figures 6-7, three groups of magnetic arc extinguishing components are designed in the embodiment, the magnetic arc extinguishing component 4-13 includes a plastic mold frame, the plastic mold frame includes a grid frame head 4-13-1 and a grid frame body 4-13-2, the grid frame body 4-13-2 is fixed on the top end of the static contact 4-12 by bolts, a plurality of grid slots are sequentially arranged on the lower side of the grid frame body 4-13-2 for corresponding installation of a plurality of arc extinguishing grid pieces 4-13-3, and the plurality of arc extinguishing grid pieces 4-13-3 are uniformly arranged in the grid slots at equal intervals. Each arc extinguishing grid piece 4-13-3 is in the shape of H with a narrow upper part and a wide lower part, the narrow upper part of the arc extinguishing grid piece 4-13-3 is a U-shaped bayonet for being clamped in the grid slot, and the wide lower part of the arc extinguishing grid piece 4-13-3 has three edges of the wide lower part stamped with inverted U-shaped arc guide channels 4-13-4, a magnetic chamber 4-13-5 with a rectangular cavity and an open end is arranged in the center of the grid frame body 4-13-2 for installation of a permanent magnet 4-13-6, and the permanent magnet 4-13-6 can be a third-generation samarium-cobalt permanent magnet or a neodymium-iron-boron permanent magnet. The permanent magnet 4-13-6 has an outer dimension of 70mmx45mmx20mm, and is subjected to orientation magnetization process to increase the single-sided magnetic force concentration, and is subjected to electroplating protection treatment on the outer surface.

[0065] The permanent magnet is packaged above the plurality of arc extinguishing grid pieces 4-13-3, and the effective oriented magnetic field completely covers the area where the electric arc of the switch is generated. When the switch generates an electric arc during circuit breaking, the electric arc is pulled into the arc extinguishing grid piece 4-13-3 under the contraction force of the magnetic force line. The oriented strong magnetic field of the permanent magnet is N-polar, and the charged arc electron-ion flow is accelerated to move to the arc extinguishing grid piece 4-13-3 under the action of the magnetic field force, enters the arc extinguishing grid piece 4-13-3 arranged at a certain distance, and the long electric arc is divided into a plurality of short electric arcs by the plurality of arc extinguishing grid pieces 4-13-3. The voltage of each short electric arc is rapidly reduced until the electric arc is extinguished and does not reignite. In the present application, the permanent magnet restrains the electric arc electron-ion flow under the electromagnetic force and moves to the inside of the arc extinguishing grid piece 4-13-3, thereby improving the arc extinguishing efficiency and the safety of the equipment.

[0066] In the embodiment, the three-phase fuses 8 are respectively installed in three corresponding hole positions below the front plate of the mechanism chamber 12 and are sealed by O-shaped sealing rings. As shown in Figure 8, the three-phase fuses in the present application are installed in the switch cabinet in a triangular arrangement and are divided into three phases A, B and C. The conductive end is connected with the three phases of the three-phase magnetic blow load switch 4 through the copper bus above and is connected with the three-phase bottom insulation sleeve 3 below. The structure is compact, which effectively improves the space utilization rate in the switch cabinet, and the switch cabinet can be miniaturized.

[0067] With reference to Figs. 9, 10 and 12, in the present application, the fuse striker tripping mechanism 7 comprises a mechanism frame 7-1 fixedly installed on the outer side of the front plate of the fuse chamber 14, the mechanism frame 7-1 is provided with mounting holes corresponding to the positions of the three-phase fuses 8, a striker mechanism top cover 7-2 is arranged on the mounting holes, an insulating silica gel cone 7-3 is arranged between the striker mechanism top cover 7-2 and the mounting holes, a striker insulating cylinder 7-4 is arranged in the inner hole of the insulating silica gel cone 7-3, a striker rod 7-5 is installed at the center of the striker insulating cylinder 7-4, the striker rod 7-5 can slide up and down, the top end of the striker rod 7-5 is opposite to a striker mechanism tripping rotary plate 7-6, one end of the striker mechanism tripping rotary plate 7-6 is clamped on the striker mechanism top cover 7-2, and the other end is connected with a tripping rotary rod 7-8 through a first connecting rod 7-7, the tripping rotary rod 7-8 is provided with a pair of tripping rotary rods 7-8, and is respectively located at the two sides of the three-phase fuses 8, when one of the fuses is fused, the thrust generated at the tail end of the fuse is enough to pop out the striker rod 7-5, the popped-out striker rod 7-5 hits the striker mechanism tripping rotary plate 7-6, the striker mechanism tripping rotary plate 7-6 rotates and then presses down the tripping rotary rod 7-8 to make it rotate, the top end of the tripping rotary rod 7-8 is connected with a tripping indicator 7-10 through a second connecting rod 7-9, so that the tripping indicator 7-10 is deviated, the front end of the tripping indicator 7-10 is connected with a tripping cable 7-11, the tripping cable 7-11 is connected with the driving part of the operating mechanism 5 of the load switch, and is used to drive the three-phase magnetic blow load switch 4 to operate.

[0068] As shown in Fig. 11, it is a schematic diagram of the overall structure of the fuse small grounding switch, the fuse small grounding switch 8 comprises a grounding mounting frame 8-1 and a grounding four-square shaft 8-2. The grounding mounting frame 8-1 is formed by blanking and deep drawing of a steel plate, and is subjected to surface galvanizing protection treatment, and various components are combined and installed thereon. The two ends of the grounding four-square shaft 8-2 are assembled in the rotating shaft holes at the two sides of the grounding mounting frame 8-1, three grounding contacts 8-3 are arranged on the grounding four-square shaft 8-2 at equal intervals, the grounding contacts 8-3 are made of red copper material and are subjected to surface silver plating treatment. The U-shaped mouth of the grounding contact 6-7 is provided with a supporting sleeve, and a long neck screw is used for fastening. One end of the grounding four-square shaft 8-2 is movably connected with the front end of a driven crank arm 8-4, and the other end is connected with a grounding connecting row 8-5. The tail end of the driven crank arm 8-4 is movably connected with the front end of a transmission connecting rod 8-6. The tail end of the transmission connecting rod 8-6 is connected with one side of the bottom angle of a triangular driving rotary plate 8-7, the top end of the triangular driving rotary plate 8-7 is rotatably connected with the rotating hole at the top end of the grounding mounting frame 8-1, and the other side of the bottom angle of the triangular driving rotary plate 8-7 is connected with the bottom of a grounding pull rod 8-1. The top end of the grounding pull rod 8-1 is rotatably connected with the insulating main shaft 4-1 of the three-phase magnetic blow load switch through a crank arm, so that when the grounding operation of the three-phase magnetic blow load switch 4 is performed, the fuse small grounding switch 8 is synchronized with the three-phase magnetic blow load switch 4 to operate, and the grounding operation of the two sides of the three-phase fuse is realized.

[0069] In addition, as shown in Figure 12, the side chamber of the cabinet 1 in the application is made of 304 stainless steel plate, which is processed by laser cutting, numerical control bending and precise argon arc welding, the connecting parts of each hole are treated by high-speed polishing and grinding, and are sealed by installing O-shaped sealing rings and applying aviation-grade corrosion-resistant long-life insulating silicone grease. The left and right rear and top inner walls of the cabinet 1 are provided with fireproof high-pressure laminated plates 15, so that when the arc in the air chamber is caused by the circuit fault of the incoming and outgoing lines, the high-temperature and high-pressure flame smoke will not burn and spray out from the left and right front and rear and top surfaces of the cabinet 1, and the reinforced inclined angle ribs 16 are installed at the corner parts of the inner surfaces of the cabinet 1, so that the air chamber will not be deformed and burst under the strong pressure airflow caused by internal failure and arc, and the safety of the personal and property in the power supply place is ensured. The bottom is designed with a circular high-pressure explosion relief device 17, the explosion relief device is sealed and installed by applying corrosion-resistant O-shaped sealing rings and aviation-grade corrosion-resistant long-life insulating silicone grease, the inside of the explosion relief device is provided with a stainless steel explosion relief membrane, 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 strong pressure flame smoke caused by arc, the explosion relief membrane can be destroyed, and the strong pressure airflow or flame smoke is discharged to the bottom cable chamber, the explosion relief device is designed and installed at the position concentric with the pressure relief channel of the bottom cable chamber, so that the strong pressure airflow or flame smoke can be directly discharged to the pressure relief channel of the bottom cable chamber, and then discharged to the underground cable trench, so that the safety of the personal and property in the power supply place is ensured. The cabinet door frame of the application is designed in a labyrinth structure, which can block the cable chamber arc high-temperature and high-pressure flame smoke caused by the circuit fault of the incoming and outgoing lines from rushing out of the cable chamber door, the inside of the cable chamber door is provided with fireproof high-pressure laminated plates, the laminated plates are provided with dustpan-shaped guide plates, the guide plates can fold the flame smoke rushing to the cable chamber door back to the cable chamber, and there is only one pressure relief channel at the bottom rear of the cable chamber, the pressure relief channel is designed to face the bottom surface, a corrosion-resistant rubber sealing plate is installed at the channel opening, which can prevent external sand, dust and water vapor from entering, and at the same time, when the cable chamber burns, the rubber sealing plate is instantaneously burned by the flame smoke, the high-temperature and high-pressure flame smoke is discharged from the pressure relief channel, enters the underground cable trench, and protects the ground equipment personnel from being hurt.

[0070] In summary, the switch cabinet with the magnetic blow load switch designed in the application can effectively improve the arc extinguishing capacity of the load switch by increasing the strong magnetic field to the arc electron ion for directional drainage and concentration through the arc extinguishing device, and solving the technical problem of low arc extinguishing capacity of the load switch in the high-voltage load switch cabinet. The switch cabinet with the magnetic blow load switch designed in the application can significantly improve the space utilization rate by compactly arranging the three-phase fuses in a triangular shape and compactly and reasonably arranging the switch mechanism and other components. The switch cabinet with the magnetic blow load switch can set a small fuse grounding switch at the lower end of the fuse to ground the load side of the fuse, so as to avoid accidents and improve the protection level of the switch cabinet.

[0071] The above embodiments are only used to describe the preferred embodiments of the present application, and not intended to limit the scope of the present application, and various changes and modifications of the present application made by those skilled in the art without departing from the spirit of the present application should fall within the scope of the present application defined by the claims.

Claims

1. A switchgear with a magnetic blow load switch, characterized in that, The cabinet body (1) comprises a cable compartment (11), a mechanism chamber (12), a closed gas chamber (13) and a fuse chamber (14); The cable compartment (11), the mechanism chamber (12), the closed gas chamber (13) and the fuse chamber (14) are arranged in the cabinet body (1); The fuse chamber (14) is installed above the back of the cable compartment (11); The closed gas chamber (13) is installed above the fuse chamber (14); The mechanism chamber (12) is installed above the cable compartment (11) and in front of the fuse chamber (14) and the closed gas chamber (13); A three-phase top insulation sleeve (2) is arranged on the top of the closed gas chamber (13); A three-phase bottom insulation sleeve (3) is arranged on the bottom of the fuse chamber (14); The three-phase bottom insulation sleeve (3) penetrates into the cable compartment (11) to connect the incoming and outgoing line cables; A three-phase magnetic blow load switch (4) is installed in the closed gas chamber (13); The three-phase top insulation sleeve (2) is connected with the top end of the three-phase magnetic blow load switch (4) through copper busbars respectively; An operating mechanism (5) of the load switch is installed above the mechanism chamber (12); The operating mechanism (5) of the load switch is located outside the front plate of the closed gas chamber (13) and is connected with the insulation main shaft (4-1) of the three-phase magnetic blow 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 triangular shape; The bottom of the three-phase magnetic blow load switch (4) is connected with the conductive terminals in the middle part of the barrel of the three-phase fuse (6) through three copper busbar rods for conduction; The barrel bottom of the three-phase fuse (6) is connected with the three-phase bottom insulation sleeve (3) through copper busbars for conduction; A fuse striker release mechanism (7) is installed below the mechanism chamber (12); The fuse striker release mechanism (7) is connected with the operating mechanism (5) of the load switch through a release cable (7-11), and the fuse striker release mechanism (7) is installed on the front of the three-phase fuse (6) and is fastened to the outside of the front plate of the fuse chamber (14), which is used for transmitting an action signal to the operating mechanism (5) of the load switch when the three-phase fuse (6) is fused, 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 fuse small grounding switch (8) is also installed in the fuse chamber (14); The fuse small grounding switch (8) is located at the bottom of the inside of the fuse chamber (14); The fuse small grounding switch (8) is connected with the insulation main shaft (4-1) of the three-phase magnetic blow load switch (4) through a grounding pull rod (8-8), and when the insulation main shaft (4-1) is rotated to perform a grounding closing operation of the three-phase magnetic blow load switch (4), the three copper busbars between the three-phase fuse (6) and the three-phase bottom insulation sleeve (3) are short-circuited to ground. ​ 2. The switchgear with magnetic blow load switch according to claim 1, characterized in that, The three-phase magnetic blow load switch (4) further comprises a switch mounting frame (4-2); a top cross beam (4-3) and a lower cross beam (4-4) are installed in parallel at the rear of the switch mounting frame (4-2); the insulating main shaft (4-1) is arranged in parallel between the top cross beam (4-3) and the lower cross beam (4-4), the tail end of the insulating main shaft (4-1) is connected with one end of the switch mounting frame (4-2) through a bearing, and the front end of the insulating main shaft (4-1) is connected with an operating mechanism (5) of the load switch by penetrating through a corresponding hole of the other end of the switch mounting frame (4-2); a grounding beam (4-5) is installed in front of the switch mounting frame (4-2), and a grounding busbar (4-6) is installed on the grounding beam (4-5); three grounding contacts (4-7) are arranged in parallel on the grounding busbar (4-6); three upper epoxy insulators (4-8) are installed at equal intervals on the top cross beam (4-3); three lower epoxy insulators (4-9) are installed at equal intervals on the lower cross beam (4-4); the upper epoxy insulators (4-8) and the lower epoxy insulators (4-9) are arranged in alignment, and a static contact connecting row (4-10) is arranged on the upper epoxy insulator (4-8); a moving contact connecting row (4-11) is installed on the lower epoxy insulator (4-9); a static contact (4-12) is installed on the static contact connecting row (4-10); a magnetic blow arc extinguishing assembly (4-13) is assembled at the top end of the static contact (4-12); the magnetic blow arc extinguishing assembly (4-13) is inclined downward and forms a certain inclination angle with the end face of the static contact (4-12); three insulating crank arms (4-14) are fixedly arranged at equal intervals on the insulating main shaft (4-1); an insulating pull rod (4-15) is connected with the front end of the insulating crank arm (4-14); a moving contact knife sleeve (4-16) is arranged at the front end of the insulating pull rod (4-15); the moving contact connecting row (4-11) is connected with 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).

3. The switchgear with magnetic blow load switch according to claim 2, characterized in that, The moving contact assembly comprises a pair of parallel arranged moving blades (4-17); a fixed distance metal support sleeve is arranged between the pair of moving blades (4-17) to form a U-shaped space for clamping the static contact (4-12).

4. The switchgear with a magnetic blowout load switch according to claim 3, characterized in that, The magnetic blow 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 on the top end of the static contact (4-12) by bolts; a plurality of grid piece notches are sequentially formed on the lower side of the grid frame body (4-13-2) for corresponding installation of a plurality of arc extinguishing grid pieces (4-13-3); each arc extinguishing grid piece (4-13-3) is in the shape of H with the upper part being narrow and the lower part being wide, the upper narrow part of the arc extinguishing grid piece (4-13-3) is a U-shaped socket for being matched and connected in the grid piece notch; the lower wide part of the arc extinguishing grid piece (4-13-3) is punched with a reverse U-shaped arc guiding channel (4-13-4) on three sides; a magnetic chamber (4-13-5) with a rectangular cavity and an open end is formed in the center of the grid frame body (4-13-2) for installing a permanent magnet (4-13-6).

5. The switchgear with a magnetic blowout load switch according to claim 4, characterized in that, The three-phase fuse (8) is respectively installed in three corresponding hole positions below the front plate of the mechanism chamber (12) and is sealed by an O-shaped sealing ring.

6. The switchgear with a magnetic blowout load switch according to claim 5, characterized in that, The fuse striker tripping mechanism (7) comprises a mechanism frame (7-1) fixedly installed outside the front plate of the fuse chamber (14); the mechanism frame (7-1) is provided with mounting holes corresponding to the positions of the three-phase fuse (8); a striker mechanism top cover (7-2) is arranged on the mounting hole; an insulating silica gel 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 silica gel cone (7-3); a striker rod (7-5) is centrally installed on the striker insulating cylinder (7-4); the striker rod (7-5) is slidable up and down, and the top end thereof is opposite to a striker mechanism tripping rotating plate (7-6); one end of the striker mechanism tripping rotating plate (7-6) is clamped on the striker mechanism top cover (7-2); the other end is connected with a tripping rotating rod (7-8) through a first connecting rod (7-7); the tripping rotating rod (7-8) is provided with a pair of tripping rotating rods and is respectively located on the two sides of the three-phase fuse (8); when one of the fuses is fused, the tail end of the fuse is sufficient to pop out the striker rod (7-5) by the pushing force generated thereby; the popped-out striker rod (7-5) strikes the striker mechanism tripping rotating plate (7-6), the striker mechanism tripping rotating plate (7-6) rotates and then presses the tripping rotating rod (7-8) to make the tripping rotating rod (7-8) rotate, the top end of the tripping rotating rod (7-8) is connected with a tripping indicator (7-10) through a second connecting rod (7-9), so that the tripping indicator (7-10) is offset, the front end of the tripping indicator (7-10) is connected with a tripping cable (7-11), the tripping cable (7-11) is connected with a driving part of an operating mechanism (5) of the load switch, and is used to drive the three-phase magnetic blow load switch (4) to be tripped.

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

8. The switchgear with a magnetic blow load switch according to claim 7, characterized in that, The inner wall of the cabinet body (1) is provided with a fireproof high-pressure laminated board (15); reinforcing bevel ribs (16) are arranged at the corners of each surface of the inner wall of the cabinet body (1); a circular high-pressure explosion venting device (17) is arranged at the bottom of the cabinet body (1); and a high-temperature-resistant moisture-absorbing fireproof sponge is attached to the joint seams of the overlapped surfaces in the cabinet body (1).

9. The switchgear with a magnetic blowout load switch according to claim 8, characterized in that, The front of the cable bin (11) is provided with a cable bin door; the front of the mechanism chamber (12) is provided with a load mechanism operation panel; the load mechanism operation panel is provided with a grounding switch opening and closing indication and a load switch opening and closing indication; the front of the fuse chamber (14) is provided with a fuse bin panel.

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