A dual power supply fast switching switch cabinet

Abstract

The present invention provides a dual-power fast-switching switch cabinet, which relates to the technical field of dual-power switching. The dual-power fast-switching switch cabinet comprises an armored switch cabinet, a shielding box is installed outside the busbar chamber of the armored switch cabinet, a dual-power fast-switching device is installed in the shielding box, and the dual-power fast-switching device comprises a bottom plate, a shielding cover plate, a rotating mechanism, a number of switch components, a magnetorheological fluid power switching mechanism, a driving electric cylinder and a main control circuit board, the shielding cover plate is installed on the right side of the bottom plate, and the rotating mechanism is installed in the middle chamber of the bottom plate. The present invention solves the problem that when the main power current fluctuates violently or is seriously abnormal, the detection circuit is damaged, resulting in the inability to switch the power supply. The magnetorheological fluid is used to monitor the main power supply, which not only ensures the high efficiency of the power switching and avoids the impact of long-term power outages on the equipment, but also greatly improves the stability of the power switching work.

Description

Technical Field

[0001] The invention relates to the technical field of dual power switching, in particular to a dual power fast switching switch cabinet. Background Art

[0002] The armored switchgear adopts a metal armor structure, has good mechanical strength and protection performance, can withstand certain external force impacts and environmental influences, and is equipped with complete electrical interlocking and mechanical interlocking devices, which can effectively prevent misoperation and ensure personal and equipment safety. In order to power the equipment as soon as possible when the main power supply is abnormal, the armored switchgear will install a dual power transfer switch outside the busbar room. When the main power supply is suddenly cut off or there is a long-term abnormality, the power supply can be switched to the backup power supply to ensure the normal use of the equipment.

[0003] The dual power conversion switch is a device that uses a monitoring circuit to monitor the voltage, frequency, phase and other parameters of two power supplies (normal power supply and backup power supply) in real time. The status information of these power supplies is obtained through sensors or detection circuits to determine whether they are normal. When the normal power supply fails, such as undervoltage, overvoltage, phase loss, abnormal frequency, etc., the control circuit of the conversion switch will make judgments and decisions based on the monitored information. Once the switching conditions are met, the control circuit will issue instructions to drive the actuator to switch the load from the normal power supply to the backup power supply. The switching action is usually fast to minimize the impact on the load. After the switch is completed, the status of the backup power supply will be continuously monitored. If the normal power supply returns to normal, it may also perform reverse switching according to the set conditions to switch the load back to the normal power supply. However, when the main power supply current fluctuates violently or there is a serious abnormality, it may interfere with the detection and control circuit of the dual power supply switching device, resulting in it being unable to accurately judge the power supply status or unable to perform the switching action in a timely and effective manner. For example, excessive current fluctuations may cause the sensor of the switching device to misjudge or fail, or cause the control circuit to malfunction or malfunction, etc. In addition, if the unstable current causes damage to some electronic components, it may also affect the normal function of the switching device. Based on the above viewpoints, technical personnel in this field have proposed a dual power supply fast switching switch cabinet with more stable and high-speed switching power supply, which has solved the above-mentioned problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a dual-power fast-switching switch cabinet, which solves the problem that when the main power current fluctuates violently or is seriously abnormal, the detection circuit is damaged, resulting in the inability to switch the power supply. Magnetorheological fluid is used to monitor the main power supply condition, which not only ensures the high efficiency of power switching and avoids the impact of long-term power outages on equipment, but also greatly improves the stability of power switching.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a dual-power fast switching switch cabinet, including an armored switch cabinet, a shielding box is installed outside the busbar room of the armored switch cabinet, a dual-power fast switching device is installed in the shielding box, and the dual-power fast switching device includes a bottom plate, a shielding cover, a rotating mechanism, a plurality of switch components, a magnetorheological fluid power switching mechanism, a driving electric cylinder and a main control circuit board, the shielding cover is installed on the right side of the bottom plate, the rotating mechanism is installed in the middle chamber of the bottom plate, a plurality of switch components are distributed in a linear array and installed on the left side of the bottom plate, the driving electric cylinder is installed on the top of the shielding cover, the magnetorheological fluid power switching mechanism is installed on the bottom of the shielding cover, and the main control circuit board is installed on the rear side of the shielding cover and is located at the rear side of the driving electric cylinder and the magnetorheological fluid power switching mechanism;

[0006] The magnetorheological fluid power switching mechanism includes a magnet fixing frame, two groups of top electromagnets, a magnetorheological fluid storage cylinder, a spring plate, a lifting rod, a connecting bent rod and a lifting spring. The two groups of top electromagnets are respectively installed on the left and right sides of the magnet fixing frame, the magnetorheological fluid storage cylinder is arranged in the middle position of the two groups of top electromagnets, the lifting spring is installed at the bottom of the magnetorheological fluid storage cylinder, the spring plate is fixed on the top of the lifting spring, the lifting rod is installed on the top of the spring plate, and the connecting bent rod is sleeved on the outer side wall of the lifting rod and cooperates with the rotating mechanism.

[0007] Preferably, the switch assembly includes an end seat, an end cover, a backup power contact, a main power contact, a copper seat and a load contact, the end cover is bolted to the left side of the end seat, the backup power contact is clamped in the middle position of the top of the end seat, the main power contact is clamped in the rear position of the top of the end seat, the copper seat is installed at the bottom of the end seat, the load contact is clamped in the middle position of the bottom of the end seat, and the load contact is connected to the copper seat through the copper assembly.

[0008] Preferably, the rotating mechanism includes a positioning member, a rotating shaft, a spring pull rod, a return spring, a number of traction members matching the number of switch components, a number of limit pull rods matching the number of switch components and a number of moving contacts matching the number of switch components, the middle position pin of the positioning member is connected to the middle chamber of the base plate, the rotating shaft is fixed to the middle position of the left side wall of the positioning member, the spring pull rod is fixed to the front end position of the left side wall of the positioning member, one end of the return spring is sleeved on the spring pull rod and the other end is sleeved on the base plate, a number of the traction members are fixed on the rotating shaft, one end of the limit pull rod is pin-connected to the moving contact and the other end is limitedly slidably connected to the traction member.

[0009] Preferably, the traction member is arranged in the lower front chamber of the end seat, the limit pull rod is slidably connected in the axial groove on the right side of the end cover, the moving contact pin shaft is connected in the rear chamber of the end seat, the top front and rear side contacts of the moving contact are respectively used in conjunction with the backup power contact and the main power contact, and the bottom of the moving contact is slidably connected above the copper seat.

[0010] Preferably, the connecting bent rod is arranged at the rear end bottom of the end seat.

[0011] Preferably, a pendulum alarm mechanism is installed on the right side of the bottom of the base plate, and the pendulum alarm mechanism includes a tail rod, two groups of bottom electromagnets, a conical cover, a connecting rope and an alarm bell. The conical cover is fixed to the right side of the bottom of the base plate, and the two groups of bottom electromagnets are arranged on the left and right sides of the conical cover. The alarm bell is connected to the bottom of the tail rod through a connecting rope. The tail rod and the connecting rope are slidably connected in the middle position of the upper side wall of the conical cover, and the top of the tail rod is connected to the bottom of the spring plate.

[0012] Preferably, an arc extinguishing and cooling mechanism is installed at the left side of the bottom of the base plate, and the arc extinguishing and cooling mechanism includes a high-voltage sealing box, a number of conical guide nozzles matching the number of switch components, a number of thin guide tubes matching the number of switch components, and a number of thick guide tubes fixed on the top of the thin guide tubes, the conical guide nozzle is arranged directly below the rear side of the switch component and is connected to the high-voltage sealing box, the thin guide tube is installed on the top of the conical guide nozzle, each of the thin guide tubes is internally limited and slidably connected with a seal, and a jet nozzle is fixedly connected to the inner side wall of the seal, a compression spring is installed on the inner top wall of the jet nozzle, a sealing steel ball is fixed below the compression spring, and the sealing steel ball is arranged in the lower chamber of the jet nozzle.

[0013] Preferably, the thick guide tube is connected to the inner cavity of the switch assembly, the connecting bent rod is fixedly connected to a plurality of seals, a lower sealing cover plate is installed at the bottom of the base plate, and a nozzle is installed on the left side of the lower sealing cover plate, and the nozzle is used in conjunction with a high-pressure sealing box.

[0014] The present invention has the following technical points and beneficial effects: the present invention does not rely on the monitoring circuit of the circuit board to monitor the current of the main power supply, thus avoiding the situation that when the current of the main power supply fluctuates violently or is seriously abnormal, the detection circuit is damaged, resulting in the inability to switch the power supply. The present invention uses magnetorheological fluid to monitor the main power supply. When the main power supply is powered off, the electromagnet cannot excite the magnetic field, and the magnetorheological fluid will change its stiffness in an instant to perform rapid power switching, which not only ensures the high efficiency of power switching and avoids the impact of long-term power outages on equipment, but also greatly improves the stability of power switching. When the current disturbance of the main power supply is large, the change in the stiffness of the magnetorheological fluid will drive the alarm bell to emit a prompt sound, and the prompt audio gradually accelerates according to the instability time of the main power supply. Maintenance personnel can judge the duration of instability of the main power supply according to the frequency of the increase, which is convenient for them to maintain the main power supply on site. At the same time, the synchronously rising connecting curved rod drives the seal to rise gradually. Since the compression spring is in a compressed state, when the seal rises in the thin guide tube, the compression spring resets, and the sealing steel ball leaves the air outlet of the nozzle first, and high-pressure helium is blown out from the air outlet of the compression spring. The low-temperature helium after throttling expansion is used to cool the components in the switch assembly. At the same time, the low-temperature helium can prevent the excitation of the arc when the current is unstable. After the helium is blown out briefly, the high-pressure helium drives the sealing steel ball again to block the air outlet of the nozzle, the helium stops blowing, and the compression spring is in a compressed state again, so that the helium is only used at the moment when the current weakens, which greatly saves the use of helium. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the dual power supply fast switching device in the present invention;

[0017] Figure 3 This is a schematic diagram of the dual power supply fast switching device of the present invention after the shielding cover plate and the lower sealing cover plate are hidden;

[0018] Figure 4 It is a first top view of the dual power supply fast switching device of the present invention after the shielding cover plate and the lower sealing cover plate are hidden;

[0019] Figure 5 for Figure 4 Isometric section view along AA;

[0020] Figure 6 is a schematic diagram of the interior of the switch assembly of the present invention;

[0021] Figure 7 It is a schematic diagram of the present invention after the switch assembly is hidden;

[0022] Figure 8It is a front side schematic diagram of the present invention after the switch assembly is hidden;

[0023] Fig. 9 A second top view of the dual power supply fast switching device of the present invention;

[0024] Fig.10 for Fig. 9 Isometric section view along BB.

[0025] Among them, 1. switch cabinet; 2. shielding box; 3. dual power supply fast switching device;

[0026] 31. Bottom plate; 32. Shielding cover plate; 33. Rotating mechanism; 34. Switch assembly; 35. Lower sealing cover plate; 36. Injection port; 37. Magnetorheological fluid power supply switching mechanism; 38. Pendulum alarm mechanism; 39. Arc extinguishing and cooling mechanism; 310. Driving electric cylinder; 311. Main control circuit board;

[0027] 331, positioning member; 332, rotating shaft; 333, traction member; 334, limit pull rod; 335, moving contact; 336, spring pull rod; 337, return spring;

[0028] 341, terminal seat; 342, end cover; 343, standby power contact; 344, main power contact; 345, copper seat; 346, load contact;

[0029] 371, top electromagnet; 372, magnet fixing frame; 373, magnetorheological fluid storage cylinder; 374, lifting rod; 375, connecting bent rod; 376, spring plate; 377, lifting spring;

[0030] 381, tail rod; 382, ​​cone cover; 383, connecting rope; 384, alarm bell; 385, bottom electromagnet;

[0031] 391. High-pressure sealing box; 392. Conical guide nozzle; 393. Sealing element; 394. Jet nozzle; 395. Compression spring; 396. Sealing steel ball; 397. Thin guide tube; 398. Thick guide tube. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1: Figure 1 , Figure 2 and Figure 3As shown, an embodiment of the present invention provides a dual-power fast switching switch cabinet, including an armored switch cabinet 1, a shielding box 2 is installed outside the busbar room of the armored switch cabinet 1, and a dual-power fast switching device 3 is installed in the shielding box 2. The dual-power fast switching device 3 includes a bottom plate 31, a shielding cover plate 32, a rotating mechanism 33, a plurality of switch components 34, a magnetorheological fluid power switching mechanism 37, a driving electric cylinder 310 and a main control circuit board 311. The shielding cover plate 32 is installed on the right side of the bottom plate 31, the rotating mechanism 33 is installed in the middle chamber of the bottom plate 31, and the plurality of switch components 34 are installed in the middle chamber of the bottom plate 31. They are distributed in a linear array and installed on the left side of the base plate 31, the driving electric cylinder 310 is installed on the top of the shielding cover 32, the magnetorheological fluid power switching mechanism 37 is installed on the bottom of the shielding cover 32, and the main control circuit board 311 is installed on the rear side of the shielding cover 32 and is located on the rear side of the driving electric cylinder 310 and the magnetorheological fluid power switching mechanism 37. The main power supply supplies power to the top electromagnet 371, and the main power supply AC is converted into DC through the rectifier circuit on the main control circuit board 311, thereby exciting a magnetic field between the two top electromagnets 371 and ensuring the stability of the magnetic field.

[0034] like Figure 4 and Figure 5 As shown, the magnetorheological fluid power switching mechanism 37 includes a magnet fixing frame 372, two groups of top electromagnets 371, a magnetorheological fluid storage cylinder 373, a spring plate 376, a lifting rod 374, a connecting bent rod 375 and a lifting spring 377. The two groups of top electromagnets 371 are respectively installed on the left and right sides of the magnet fixing frame 372, the magnetorheological fluid storage cylinder 373 is set in the middle position of the two groups of top electromagnets 371, the lifting spring 377 is installed at the bottom of the magnetorheological fluid storage cylinder 373, the spring plate 376 is fixed on the top of the lifting spring 377, and the lifting spring 377 is installed at the bottom of the magnetorheological fluid storage cylinder 373. The rod 374 is installed on the top of the spring plate 376, and the connecting curved rod 375 is sleeved on the outer wall of the lifting rod 374 and cooperates with the rotating mechanism 33. The magnetorheological fluid in the magnetorheological fluid storage tube 373 will be transformed from a Newtonian fluid to a Bingham fluid with a certain stiffness under the action of the magnetic field, thereby preventing the spring plate 376 from lifting. When the main power supply is suddenly cut off, the magnetic field between the two top electromagnets 371 disappears, and the magnetorheological fluid in the magnetorheological fluid storage tube 373 will be transformed into a Newtonian fluid in a very short time, and the lifting spring 377 will drive the spring plate 376 to rise.

[0035] like Figure 6 , Figure 7 and Figure 8As shown, the switch assembly 34 includes an end seat 341, an end cover 342, a backup power contact 343, a main power contact 344, a copper seat 345 and a load contact 346. The end cover 342 is bolted to the left side of the end seat 341, the backup power contact 343 is clamped in the middle position of the top of the end seat 341, the main power contact 344 is clamped in the position of the top of the end seat 341 near the back, the copper seat 345 is installed at the bottom of the end seat 341, the load contact 346 is clamped in the middle position of the bottom of the end seat 341, and the load contact 346 is connected to the copper seat 345 through the copper assembly. The rotating mechanism 33 includes a positioning member 331, a rotating shaft 332, and a spring. A spring pull rod 336, a return spring 337, a plurality of traction members 333 matching the number of switch assemblies 34, a plurality of limit pull rods 334 matching the number of switch assemblies 34, and a plurality of moving contacts 335 matching the number of switch assemblies 34, the middle position pin of the positioning member 331 is connected to the middle chamber of the bottom plate 31, the rotating shaft 332 is fixed to the middle position of the left side wall of the positioning member 331, the spring pull rod 336 is fixed to the front end of the left side wall of the positioning member 331, one end of the return spring 337 is sleeved on the spring pull rod 336 and the other end is sleeved on the bottom plate 31, and a plurality of traction members 333 are fixed on the rotating shaft 33 2, one end of the limit pull rod 334 is connected to the moving contact 335 by a pin shaft, and the other end is connected to the traction member 333 by a limited sliding. The traction member 333 is arranged in the lower front chamber of the end seat 341, and the limit pull rod 334 is connected to the axial groove on the right side of the end cover 342 by a limited sliding. The moving contact 335 is connected to the rear chamber of the end seat 341 by a pin shaft. The top front and rear side contacts of the moving contact 335 are respectively used in conjunction with the backup power contact 343 and the main power contact 344. The bottom of the moving contact 335 is connected to the top of the copper seat 345 by a sliding connection. The connecting bent rod 375 is arranged at the bottom of the rear end of the end seat 341. The connecting bent rod 375 is connected to the spring plate 3 When it moves quickly to the top position under the drive of 76, the prying positioning piece 331 rotates, and the rotating positioning piece 331 drives the rotating shaft 332 to rotate, and then the traction piece 333 is used to pull the limiting pull rod 334, and the moving contact 335 is driven by the limiting pull rod 334 to fit with the backup power supply contact 343, and then the power supply is switched to the backup power supply. Since the magnetorheological fluid has an extremely fast response speed under the action of the magnetic field, it can respond to the power failure of the main power supply in the first time, so that the device can switch the power supply in the first time when the main power supply is cut off, and the device does not rely on the monitoring circuit to monitor the main power supply, ensuring that the power switching work can still be performed in extreme environments.

[0036] Embodiment 2: Figure 3 , Figure 4 and Figure 5As shown, this embodiment provides another technical solution based on the first embodiment. A pendulum alarm mechanism 38 is installed at the right side of the bottom of the bottom plate 31. The pendulum alarm mechanism 38 includes a tail rod 381, two groups of bottom electromagnets 385, a conical cover 382, ​​a connecting rope 383 and an alarm bell 384. The conical cover 382 is fixed to the right side of the bottom of the bottom plate 31. The two groups of bottom electromagnets 385 are arranged on the left and right sides of the conical cover 382. The alarm bell 384 is connected to the bottom of the tail rod 381 through a connecting rope 383. The tail rod 381 and the connecting rope 383 are slidably connected to the conical cover 382. The top of the tail rod 381 is connected to the bottom of the spring plate 376. When the power is switched, the tail rod 381 pulls the alarm bell 384 to move to the top of the conical cover 382, ​​and the bottom electromagnet 385 is powered by a battery or a backup power supply. Under the influence of the two bottom electromagnets 385, the alarm bell 384 keeps swinging between the two bottom electromagnets 385, and then hits the conical cover 382 to emit a warning sound, which can remind the maintenance personnel to maintain the main power supply at the first time. When the main power supply is unstable, the two top electromagnets 371 are connected to the current. The magnetic field excited between the top electromagnets 371 is unstable, and the stiffness of the magnetorheological fluid in the magnetorheological fluid storage tube 373 between the top electromagnets 371 changes repeatedly, and the spring plate 376 gradually rises when the magnetorheological fluid changes. Since the stiffness of the magnetorheological fluid changes repeatedly, the spring plate 376 rises when the stiffness of the magnetorheological fluid decreases, and stops when the stiffness of the magnetorheological fluid increases. Therefore, the spring plate 376 will gradually rise, and the gradually rising spring plate 376 will drive the tail rod 381 to gradually rise. When the alarm bell 384 comes to the inside of the conical cover 382, ​​the alarm bell 384 will sound. 84 hits the cone cover 382 to issue a warning sound, and the warning audio gradually speeds up according to the unstable time of the main power supply (when the current is unstable, the tail rod 381 gradually rises, and the rising tail rod 381 drives the alarm bell 384 to rise. Because the length of the connecting rope 383 inside the cone cover 382 gradually becomes shorter, and the distance between the cone covers 382 on both sides of the alarm bell 384 is reduced, the swing amplitude of the alarm bell 384 is accelerated, and the speed of the alarm bell 384 hitting the cone cover 382 is increased). The maintenance personnel can judge the unstable time of the main power supply according to the increased frequency, which is convenient for them to maintain the main power supply on site.

[0037] like Figure 2 , Fig. 9 and Fig.10As shown, an arc extinguishing and cooling mechanism 39 is installed at the left side of the bottom of the bottom plate 31, and the arc extinguishing and cooling mechanism 39 includes a high-voltage sealing box 391, a plurality of conical guide nozzles 392 matching the number of switch components 34, a plurality of thin guide tubes 397 matching the number of switch components 34, and a plurality of thick guide tubes 398 fixed on the top of the thin guide tubes 397. The conical guide nozzle 392 is arranged just below the rear side of the switch component 34 and is connected to the high-voltage sealing box 391. The thin guide tube 397 is installed on the top of the conical guide nozzle 392. Each thin guide tube 397 is internally limited and slidably connected with a seal 393, and the seal 393 A jet nozzle 394 is fixedly connected to the inner wall of the nozzle 394, a compression spring 395 is installed on the inner top wall of the nozzle 394, a sealing steel ball 396 is fixed below the compression spring 395, and the sealing steel ball 396 is arranged in the lower chamber of the nozzle 394. The thick guide tube 398 is connected to the inner cavity of the switch assembly 34, the connecting curved rod 375 is fixedly connected to a plurality of sealing members 393, a lower sealing cover plate 35 is installed at the bottom of the bottom plate 31, and a nozzle 36 is installed on the left side of the lower sealing cover plate 35, and the nozzle 36 is used in conjunction with the high-pressure sealing box 391, and the connecting curved rod 375 that rises together with the lifting rod 374 pulls the nozzle 394 The high-pressure nitrogen enters the thick guide tube 398, so that the high-pressure helium stored in the high-pressure sealing box 391 enters the end seat 341 from the conical guide nozzle 392. The conical guide nozzle 392 is conical. The high-pressure nitrogen expands when passing through the conical guide nozzle 392, thereby reducing the temperature of the helium, and cooling the contacts, circuits and copper sheets in the end seat 341 to prevent the switching circuit from being fused due to high temperature at the moment of current connection due to aging of the wires. When the main power supply is unstable, the synchronously rising connecting bent rod 375 drives the sealing member 393 to gradually rise. Since the compression spring 395 is in a compressed state, when the sealing member 393 is When the seal 393 rises in the thin guide tube 397, the compression spring 395 is reset, and the sealing steel ball 396 leaves the air outlet of the compression spring 395 first, and the high-pressure helium is blown out from the air outlet of the compression spring 395. The low-temperature helium after throttling expansion is used to cool the components in the switch assembly 34. At the same time, the low-temperature helium can prevent the arc from being excited when the current is unstable. After the helium is blown out briefly, the high-pressure helium drives the sealing steel ball 396 again to block the air outlet of the jet nozzle 394, and the helium stops blowing out. The compression spring 395 is in a compressed state again, so that the helium is only used at the moment when the current becomes weak, which greatly saves the use of helium.

[0038] Working principle: connect the main power line to the main power contact 344, the backup power line to the backup power contact 343, and the load line to the load contact 346. The main power supplies power to the top electromagnet 371, and converts the main power AC into DC through the rectifier circuit on the main control circuit board 311, thereby exciting the magnetic field between the two top electromagnets 371 and ensuring the stability of the magnetic field. Under the action of the magnetic field, the magnetorheological fluid in the magnetorheological fluid storage cylinder 373 will be transformed from a Newtonian fluid to a Bingham fluid with a certain stiffness, preventing the spring plate 376 from lifting. When the main power is suddenly cut off, the magnetic field between the two top electromagnets 371 disappears, and the magnetorheological fluid in the magnetorheological fluid storage cylinder 373 will be in a very short time. When it changes into a Newtonian fluid, the lifting spring 377 will drive the spring plate 376 to rise, and when the connecting curved rod 375 is driven by the spring plate 376 to quickly move to the top position, the prying positioning member 331 rotates, and the rotating positioning member 331 drives the rotating shaft 332 to rotate, and then the traction member 333 is used to pull the limiting pull rod 334, and the moving contact 335 is driven to fit with the backup power supply contact 343 through the limiting pull rod 334, and then the power supply is switched to the backup power supply. Since the magnetorheological fluid has an extremely fast response speed under the action of the magnetic field, it can respond to the power failure of the main power supply in the first time, so that the device can switch the power supply in the first time when the main power supply is cut off, and the device does not rely on the monitoring circuit to monitor the main power supply, which ensures that it can be used in extreme environments. The power switching operation can still be performed, and while switching the power, the tail rod 381 pulls the alarm bell 384 to move to the top of the conical cover 382, ​​and the bottom electromagnet 385 is powered by a battery or a backup power supply. Under the influence of the two bottom electromagnets 385, the alarm bell 384 keeps swinging between the two bottom electromagnets 385 (the two bottom electromagnets 385 are powered intermittently, and only one side of the electromagnet is powered at the same time, thereby attracting the alarm bell 384 to swing back and forth between the two bottom electromagnets 385), and then hits the conical cover 382 to emit a warning sound, which can remind the maintenance personnel to maintain the main power supply as soon as possible, and the connecting curved rod 375 that rises with the jacking rod 374 pulls the jet nozzle 39 4 comes into the thick guide tube 398 (when the jet nozzle 394 rises, the bottom of the sealing member 393 will rise synchronously with the jet nozzle 394, thereby sealing the gap opened on the thin guide tube 397, and the gap provides conditions for connecting the curved rod 375 and the jet nozzle 394), so that the high-pressure helium stored in the high-pressure sealing box 391 enters the end seat 341 from the conical guide nozzle 392, and the conical guide nozzle 392 is conical. When the high-pressure nitrogen passes through the conical guide nozzle 392, it throttles and expands, thereby reducing the temperature of the helium, and can cool down the contacts, circuits and copper sheets in the end seat 341, so as to prevent the problem of the switching circuit being fused due to high temperature at the moment of current access due to aging of the wires;

[0039] When the main power supply is unstable, the current connected to the two top electromagnets 371 is unstable, so that the magnetic field excited between the top electromagnets 371 is unstable, and the stiffness of the magnetorheological fluid in the magnetorheological fluid storage tube 373 between the top electromagnets 371 changes repeatedly, and the spring plate 376 gradually rises when the magnetorheological fluid changes. Since the stiffness of the magnetorheological fluid changes repeatedly, the spring plate 376 rises when the stiffness of the magnetorheological fluid decreases and stops when the stiffness of the magnetorheological fluid increases. Therefore, the spring plate 376 will gradually rise, and the gradually rising spring plate 37 6 will drive the tail rod 381 to gradually rise. When the alarm bell 384 reaches the inside of the cone cover 382, ​​the alarm bell 384 hits the cone cover 382 to issue a prompt sound, and the prompt audio gradually speeds up according to the unstable time of the main power supply (when the current is unstable, the tail rod 381 gradually rises, and the rising tail rod 381 drives the alarm bell 384 to rise. Because the length of the connecting rope 383 inside the cone cover 382 gradually shortens, and the distance between the cone covers 382 on both sides of the alarm bell 384 decreases, the swing frequency of the alarm bell 384 speeds up, and the alarm bell 384 hits the cone cover 382. 2), the maintenance personnel can judge the duration of instability of the main power supply according to the lifting frequency, which is convenient for them to maintain the main power supply on site. At the same time, the gradually rising jacking rod 374 drives the connecting bent rod 375 to rise synchronously, and the synchronously rising connecting bent rod 375 drives the sealing member 393 to rise gradually. Since the compression spring 395 is in a compressed state (the sealing steel ball 396 is squeezed by the high-pressure helium gas to squeeze the compression spring 395, so the compression spring 395 is in a compressed state), when the sealing member 393 rises in the thin guide tube 397, the compression spring 395 is compressed. The spring 395 is reset first, the sealing steel ball 396 leaves the air outlet of the jet nozzle 394, and the high-pressure helium is blown out from the air outlet of the jet nozzle 394. The low-temperature helium after throttling expansion is used to cool the components in the switch assembly 34. At the same time, the low-temperature helium can prevent the arc from being excited when the current is unstable. After the helium is blown out briefly, the high-pressure helium drives the sealing steel ball 396 again to block the air outlet of the jet nozzle 394, and the helium stops blowing out. The compression spring 395 is in a compressed state again, so that the helium is only used at the moment when the current becomes weak, which greatly saves the use of helium.

[0040] When the main power supply is restored or the main power supply becomes stable after a period of time, the monitoring circuit of the main control circuit board 311 first cuts off its power supply to the top electromagnet 371, so that the magnetorheological fluid in the magnetorheological fluid storage tube 373 becomes a Newtonian fluid, and then drives the electric cylinder 310 to press the lifting rod 374 for reset. After the positioning member 331 loses the push of the connecting curved rod 375, the reset spring 337 pulls the positioning member 331 to reset, so that the power supply is switched back to the main power supply. After the switch is completed, the main control circuit board 311 restores its power supply to the top electromagnet 371 and drives the electric cylinder 310 to reset.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual power supply fast switching switch cabinet, comprising an armored switch cabinet (1), characterized in that: A shielding box (2) is installed outside the busbar chamber of the armored switch cabinet (1), and a dual power supply fast switching device (3) is installed inside the shielding box (2). The dual power supply fast switching device (3) comprises a bottom plate (31), a shielding cover plate (32), a rotating mechanism (33), a plurality of switch components (34), a magnetorheological fluid power supply switching mechanism (37), a driving electric cylinder (310) and a main control circuit board (311). The shielding cover plate (32) is installed on the right side of the bottom plate (31). (33) is installed in the middle chamber of the base plate (31), a plurality of switch components (34) are distributed in a linear array and installed on the left side of the base plate (31), the driving electric cylinder (310) is installed on the top of the shielding cover plate (32), the magnetorheological fluid power supply switching mechanism (37) is installed on the bottom of the shielding cover plate (32), and the main control circuit board (311) is installed on the rear side of the shielding cover plate (32) and is located on the rear side of the driving electric cylinder (310) and the magnetorheological fluid power supply switching mechanism (37); The magnetorheological fluid power supply switching mechanism (37) comprises a magnet fixing frame (372), two groups of top electromagnets (371), a magnetorheological fluid storage cylinder (373), a spring plate (376), a lifting rod (374), a connecting curved rod (375) and a lifting spring (377). The two groups of top electromagnets (371) are respectively mounted on the left and right sides of the magnet fixing frame (372). The magnetorheological fluid storage cylinder (373) is arranged in the middle position of the two groups of top electromagnets (371). The lifting spring (377) is mounted on the bottom of the magnetorheological fluid storage cylinder (373). The spring plate (376) is fixed on the top of the lifting spring (377). The lifting rod (374) is mounted on the top of the spring plate (376). The connecting curved rod (375) is sleeved on the outer side wall of the lifting rod (374) and cooperates with the rotating mechanism (33).

2. A dual power supply fast switching switch cabinet according to claim 1, characterized in that: The switch assembly (34) comprises an end seat (341), an end cover (342), a standby power contact (343), a main power contact (344), a copper seat (345) and a load contact (346); the end cover (342) is bolted to the left side of the end seat (341); the standby power contact (343) is clamped at the middle position of the top of the end seat (341); the main power contact (344) is clamped at the rear side of the top of the end seat (341); the copper seat (345) is installed at the bottom of the end seat (341); the load contact (346) is clamped at the middle position of the bottom of the end seat (341); and the load contact (346) is connected to the copper seat (345) via a copper assembly.

3. A dual power supply fast switching switch cabinet according to claim 2, characterized in that: The rotating mechanism (33) comprises a positioning member (331), a rotating shaft (332), a spring pull rod (336), a return spring (337), a plurality of traction members (333) whose number matches the number of switch assemblies (34), a plurality of limit pull rods (334) whose number matches the number of switch assemblies (34), and a plurality of moving contacts (335) whose number matches the number of switch assemblies (34), wherein a middle position pin of the positioning member (331) is connected to a middle cavity of the bottom plate (31), and the rotating shaft (33 2) fixed at the middle position of the left side wall of the positioning member (331), the spring pull rod (336) is fixed at the front end position of the left side wall of the positioning member (331), one end of the return spring (337) is sleeved on the spring pull rod (336) and the other end is sleeved on the bottom plate (31), a plurality of the traction members (333) are fixed on the rotating shaft (332), one end of the limit pull rod (334) is pin-connected to the moving contact (335) and the other end is limit-slidably connected to the traction member (333).

4. A dual power supply fast switching switch cabinet according to claim 3, characterized in that: The traction member (333) is arranged in the lower front chamber of the end seat (341), the limit pull rod (334) is limitedly slidably connected in the axial groove on the right side of the end cover (342), the pin shaft of the moving contact (335) is connected in the rear chamber of the end seat (341), the top front and rear side contacts of the moving contact (335) are respectively used in conjunction with the backup power contact (343) and the main power contact (344), and the bottom of the moving contact (335) is slidably connected above the copper seat (345).

5. A dual power supply fast switching switch cabinet according to claim 4, characterized in that: The connecting bent rod (375) is arranged at the rear end bottom of the end seat (341).

6. A dual power supply fast switching switch cabinet according to claim 1, characterized in that: A pendulum alarm mechanism (38) is installed at the right side of the bottom of the base plate (31). The pendulum alarm mechanism (38) comprises a tail rod (381), two groups of bottom electromagnets (385), a conical cover (382), a connecting rope (383) and an alarm bell (384). The conical cover (382) is fixed at the right side of the bottom of the base plate (31). The two groups of bottom electromagnets (385) are arranged on the left and right sides of the conical cover (382). The alarm bell (384) is connected to the bottom of the tail rod (381) through a connecting rope (383). The tail rod (381) and the connecting rope (383) are slidably connected at the middle position of the upper side wall of the conical cover (382). The top of the tail rod (381) is connected to the bottom of the spring plate (376).

7. The dual power supply fast switching switch cabinet according to claim 1, characterized in that: An arc extinguishing and cooling mechanism (39) is installed at the left side of the bottom of the base plate (31), the arc extinguishing and cooling mechanism (39) comprising a high-voltage sealing box (391), a plurality of conical flow guide nozzles (392) matching the number of switch assemblies (34), a plurality of thin flow guide tubes (397) matching the number of switch assemblies (34), and a plurality of thick flow guide tubes (398) fixed on the top of the thin flow guide tubes (397), the conical flow guide nozzles (392) being arranged directly below the rear side of the switch assembly (34) and being connected to the high-voltage sealing box (391). 91), the thin guide tube (397) is installed on the top of the conical guide nozzle (392), each of the thin guide tubes (397) is internally limited and slidably connected with a seal (393), and the inner side wall of the seal (393) is fixedly connected with a jet nozzle (394), the inner top wall of the jet nozzle (394) is installed with a compression spring (395), and a sealing steel ball (396) is fixed below the compression spring (395), and the sealing steel ball (396) is arranged in the lower chamber of the jet nozzle (394).

8. The dual power supply fast switching switch cabinet according to claim 7, characterized in that: The thick guide tube (398) is in communication with the inner cavity of the switch assembly (34); the connecting bent rod (375) is fixedly connected to a plurality of sealing members (393); a lower sealing cover plate (35) is installed at the bottom of the base plate (31); and a nozzle (36) is installed on the left side of the lower sealing cover plate (35); the nozzle (36) is used in conjunction with a high-pressure sealing box (391).

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