Power distribution intelligent alternating-current high-voltage switch cabinet capable of preventing electric arc from overflowing

Abstract

The invention relates to the technical field of switch cabinets, in particular to a power distribution intelligent alternating-current high-voltage switch cabinet capable of preventing electric arc overflow, which comprises a cabinet body, and a bracket and a fixed plate which are fixed in the cabinet body, and is characterized in that an electric control structure is arranged on the bracket; the pump air cylinder is fixed on the fixing plate, and an air storage tank is fixed on the pump air cylinder; the first piston disc is connected into the pump air cylinder in a sliding and sealing mode, the first piston disc is connected with a second piston disc in a sliding and sealing mode, the second piston disc is connected with the inner wall of the pump air cylinder in a sliding and sealing mode, a high-pressure cavity is formed between the first piston disc and the pump air cylinder and between the second piston disc and the pump air cylinder, and a conduction switching mechanism is arranged on the pump air cylinder; according to the invention, when the current fluctuates, the position of the first piston disc can be constrained, when the current exceeds a set value, the constraint on the first piston disc is relieved, and meanwhile, under the action of the energy storage triggering mechanism, high-voltage arc extinguishing gas is quickly sprayed to an arc area so as to execute efficient arc extinguishing action.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switch cabinets, and particularly relates to an intelligent AC high-voltage switch cabinet for power distribution capable of preventing arc overflow. BACKGROUND

[0002] The AC high-voltage switch cabinet is a key device for distributing, controlling and protecting high-voltage power in a power system, and is widely used in substation, industrial and mining enterprises, power plant and other places.

[0003] In the AC high-voltage switch cabinet, preventing arc overflow (arc jet) is a key measure to ensure the safety of equipment and personnel. Arc fault may be caused by short circuit, overload and other conditions, and its high temperature and shock wave may cause serious harm.

[0004] The existing arc overflow prevention is usually to use arc extinguishing grid to extinguish arc, and to use metal grid to divide long arc into multiple short arcs, and then to use near-cathode effect or side-on voltage drop to extinguish arc. However, this method can only extinguish arc and cannot quickly cool the high temperature generated by arc. Long-term use may cause damage to the grid. To this end, the arc high temperature can be cooled by gas blowing. The gas blowing acts on the arc to forcibly cool and lengthen the arc path. However, the gas blowing needs to compress the gas by mechanical action after the arc is generated, which results in slow response speed. As the amount of arc extinguishing gas in the gas tank decreases, the arc extinguishing gas will be diluted, resulting in a decrease in the amount of arc extinguishing gas sprayed in the subsequent process, and thus poor arc extinguishing effect. SUMMARY

[0005] The present application aims to provide an intelligent AC high-voltage switch cabinet for power distribution capable of preventing arc overflow to solve the problems in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an intelligent AC high-voltage switch cabinet for power distribution capable of preventing arc overflow, comprising a cabinet body, a support and a fixed plate fixed in the cabinet body, and an electric control structure arranged on the support; further comprising a pump cylinder fixed on the fixed plate, a gas storage tank for storing high-pressure arc extinguishing gas fixed on the pump cylinder; a first piston disc slidingly and sealingly connected in the pump cylinder, a second piston disc slidingly connected on the first piston disc, the second piston disc also slidingly and sealingly connected with the inner wall of the pump cylinder, a high-pressure chamber formed between the first piston disc, the second piston disc and the pump cylinder, a conduction switching mechanism arranged on the pump cylinder, the conduction switching mechanism capable of pumping the high-pressure arc extinguishing gas in the gas storage tank into the high-pressure chamber to constrain the position of the first piston disc when the current fluctuates; an energy storage triggering mechanism arranged in the pump cylinder, the energy storage triggering mechanism capable of adjusting the conduction state of the pump cylinder through the conduction switching mechanism when the first piston disc slides axially along the pump cylinder to spray arc extinguishing gas to the arc region.

[0007] As a further scheme of the present application, the switch-on switching mechanism comprises a delivery pipe communicated with the outer wall of the pump cylinder, the delivery pipe is communicated with the gas storage tank and the high-pressure chamber, and a first electromagnetic valve is fixed on the delivery pipe.

[0008] As a further scheme of the present application, the switch-on switching mechanism further comprises a pump pipe communicated with the outer wall of the pump cylinder, a blowing nozzle is communicated with the end of the pump pipe, and a second electromagnetic valve is fixed on the pump pipe.

[0009] As a further scheme of the present application, the energy storage triggering mechanism comprises a second telescopic rod fixed in the pump cylinder, an active disc is fixed at the end of the second telescopic rod and connected with the first piston disc, and an elastic assembly and a connecting assembly for storing energy and performing triggering action are arranged in the pump cylinder and connected with the active disc.

[0010] As a further scheme of the present application, the elastic assembly comprises a support plate fixed in the pump cylinder, a spring is sleeved on the second telescopic rod, and the two ends of the spring are respectively abutted with the support plate and the active disc.

[0011] As a further scheme of the present application, the connecting assembly comprises a moving contact fixed on the active disc, and a stationary contact fixed on the support plate and abutted with the moving contact.

[0012] As a further scheme of the present application, the pump cylinder is communicated with an absorbing pipe and a gas delivery pipe, and the gas delivery pipe is communicated with the gas storage tank.

[0013] As a further scheme of the present application, a first telescopic rod is fixed in the gas storage tank, and a sealing disc is fixed at the end of the first telescopic rod and connected with the gas storage tank in a sliding sealing mode.

[0014] As a further scheme of the present application, an iron core is fixed on the fixed plate, a coil is wound on the iron core, and the coil can generate electromagnetic force in cooperation with the iron core when electrified.

[0015] As a further scheme of the present application, a magnet disc repelling electromagnetic force is fixed on the second piston disc.

[0016] Compared with the prior art, the application has the beneficial effects that: the application can inhibit the reciprocating movement of the first piston disc caused by current fluctuation through the action of air pressure pushing, and automatically adjust the pressure in the gas storage tank to ensure that the amount of arc extinguishing gas pumped each time is constant. Specifically, if the current in the circuit fluctuates and the fluctuation range is within the normal value, the electromagnetic force drives the second piston disc to move towards the first piston disc, so that the pressure in the high-pressure chamber increases to overcome the electromagnetic force. In this way, the force acting on the second piston disc is adaptively adjusted according to the fluctuation of the current, avoiding the problem that the arc extinguishing gas continuously enters or is discharged from the pump cylinder due to fluctuation caused by the separate arrangement of the first piston disc or the second piston disc. If an overload or short circuit occurs in the circuit, the current will increase, and after the electromagnetic force drives the movable disc to move to the end of the stroke, the circuit is disconnected, the spring is elastically released, and the movable disc is quickly driven to move towards the initial position, thereby driving the first piston disc and the second piston disc to move, so that the arc extinguishing gas in the gas storage chamber is in a pressurized state, and is delivered to the blowing nozzle through the pump pipe. The blowing nozzle can spray high-pressure arc extinguishing gas in the arc generation area. Under the action of the arc extinguishing gas, not only the effect of temperature reduction and arc extinguishing can be achieved, but also the shock wave generated by the high temperature of the arc can be resisted, and the flow of the high-temperature heat generated by the arc can be guided, preventing the problem of damage to the parts in the cabinet caused by the accumulation of high-temperature heat.

[0017] The volume change of the gas storage chamber caused by the movement of the movable disc is the amount of gas delivered from the gas storage tank to the pump cylinder, and by changing the pressure in the balance chamber, air can be automatically pumped into the second chamber to ensure that after the arc extinguishing gas is discharged from the gas storage tank each time, the position of the sealing disc is adaptively adjusted under the pressure of the second chamber, so that the first chamber is always within a certain pressure range, thereby ensuring that the amount of subsequent pumped arc extinguishing gas is sufficient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Structure schematic diagram of an embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 2 Structure schematic diagram of another angle in an embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 3 Structure schematic diagram of another angle in an embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 2 Structure schematic diagram of another angle in an embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 4 Structure schematic diagram of another angle in an embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 5 Structure schematic diagram of another angle in an embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 6 Structure schematic diagram of another angle in an embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 5 Structure schematic diagram of another angle in an embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 7 Structure diagram of first piston disc, second piston disc, part of energy storage trigger mechanism in one embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 8 Structure diagram of second telescopic rod, first piston disc, second piston disc, energy storage trigger mechanism in one embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 9 Explosion structure diagram of first piston disc, second piston disc, magnet disc, part of energy storage trigger mechanism in one embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow; Figure 10 Structure diagram of iron core, coil in one embodiment of the intelligent AC high-voltage switch cabinet for preventing arc overflow.

[0019] In the figure: 1, cabinet body; 2, support; 3, fixed plate; 4, controller; 5, first power connection piece; 6, second power connection piece; 7, pump cylinder; 8, iron core; 9, coil; 10, support plate; 11, gas storage tank; 12, conveying pipe; 13, first electromagnetic valve; 14, pump gas pipe; 15, second electromagnetic valve; 16, air blowing nozzle; 17, absorption pipe; 18, air feeding pipe; 19, first telescopic rod; 20, sealing disc; 21, second telescopic rod; 22, first piston disc; 2201, second piston disc; 23, magnet disc; 24, movable disc; 25, moving contact; 26, stationary contact; 27, spring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] In addition, the elements in the present application are referred to as "fixed to" or "provided on" another element, which can be directly on another element or can have a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can have a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0022] Please refer to Figures 1-10The embodiment of the application discloses an intelligent alternating-current high-voltage switch cabinet capable of preventing arc overflow, which comprises a cabinet body 1, a support 2 and a fixed plate 3 fixed in the cabinet body 1, an electric control structure arranged on the support 2, the electric control structure comprising a controller 4 fixed on the support 2, a first electric contact piece 5 fixed on the controller 4, a second electric contact piece 6 fixed on the support 2 and matched with the first electric contact piece 5, a pump cylinder 7 fixed on the fixed plate 3, a gas storage tank 11 fixed on the pump cylinder 7 and used for storing high-pressure arc extinguishing gas, a first piston disc 22 slidingly and sealingly connected in the pump cylinder 7, a second piston disc 2201 slidingly connected on the first piston disc 22, the second piston disc 2201 also slidingly and sealingly connected with the inner wall of the pump cylinder 7, a high-pressure chamber formed between the first piston disc 22, the second piston disc 2201 and the pump cylinder 7, a conduction switching mechanism arranged on the pump cylinder 7, the conduction switching mechanism being capable of pumping the high-pressure arc extinguishing gas in the gas storage tank 11 into the high-pressure chamber so as to constrain the position of the first piston disc 22 when the current fluctuates, and an energy storage triggering mechanism arranged in the pump cylinder 7, the energy storage triggering mechanism being capable of adjusting the conduction state of the pump cylinder 7 through the conduction switching mechanism when the first piston disc 22 axially slides along the pump cylinder 7, so as to spray the arc extinguishing gas to an arc area.

[0023] The fixed plate 3 is fixed with an iron core 8, the iron core 8 is wound with a coil 9, the coil 9 is capable of generating electromagnetic force in cooperation with the iron core 8 when the coil 9 is electrified, and the second piston disc 2201 is fixed with a magnet disc 23 repelling the electromagnetic force.

[0024] Specifically, in order to prevent arc overflow and ensure the safe use of the switch cabinet, when the arc is generated, the arc needs to be extinguished in time. Since the pump cylinder 7 and the gas storage tank 11 are connected to each other under the control of the conduction switching mechanism, the high-pressure arc extinguishing gas will enter the high-pressure chamber and move the second piston disc 2201 away from the first piston disc 22 under the action of gas pressure, so as to maximize the size of the high-pressure chamber. When the first contact piece 5 and the second contact piece 6 abut each other, the current is in the on state, and the current is within the normal range, so the current flowing through the coil 9 will not be too large, and thus the electromagnetic force generated by the cooperation of the iron core 8 and the coil 9 is small, and the magnetic pole of the electromagnetic force is the same as that of the magnet disc 23. In this regard, the electromagnetic force will provide a certain repulsive force to the magnet disc 23, which cannot overcome the restraining force of the gas pressure on the second piston disc 2201, so the position of the first piston disc 22 will not change. If the current in the circuit fluctuates and the fluctuation range is within the normal value, the electromagnetic force will drive the second piston disc 2201 to move towards the first piston disc 22, so that the pressure in the high-pressure chamber increases to overcome the electromagnetic thrust. In this way, through the action of the gas pressure provided by the high-pressure arc extinguishing gas, the reciprocating movement of the first piston disc 22 caused by current fluctuation can be avoided, thereby ensuring that the arc extinguishing gas will not overflow. If an overload or short circuit occurs in the circuit, the current will increase, at which time the circuit breaker will work and control the first contact piece 5 and the second contact piece 6 to separate, so that the circuit is in the off state. When the first contact piece 5 and the second contact piece 6 are disconnected, an arc will be generated. Before the circuit is disconnected, the current flowing through the coil 9 is large, which causes the electromagnetic force to increase. The electromagnetic force will overcome the restraining force of the gas pressure on the second piston disc 2201 and drive the first piston disc 22 to slide, so that the high-pressure arc extinguishing gas enters the pump cylinder 7. The first piston disc 22 will also drive the energy storage trigger mechanism to move. When the first piston disc 22 moves to the end of the stroke, the energy storage trigger mechanism controls the gas storage tank 11 to no longer communicate with the pump cylinder 7 through the conduction switching mechanism. At the same time, the conduction switching mechanism cooperates with the energy storage trigger mechanism to quickly spray the arc extinguishing gas in the pump cylinder 7 to the required arc extinguishing area. Under the action of the high-pressure arc extinguishing gas, the arc can be extinguished and the heat source generated by the arc can be guided to flow, so as to prevent the problem of damage to the parts in the cabinet 1 caused by heat accumulation.

[0025] The circuit breaker is provided with current sensing and triggering structure, which can detect the current of the first contact piece 5 and the second contact piece 6, and control the connection and disconnection of the two according to the current size. The alternating current in the switch cabinet circuit can be converted into direct current through rectification. The current flowing through the coil 9 is direct current, and the current size is matched with the alternating current in the switch cabinet according to a certain proportion. The current flowing direction and the winding direction of the coil 9 will not change, and the magnetic pole direction of the electromagnetic force will not change. The magnetic pole of the magnet disc 23 is the same as that of the electromagnetic force. Therefore, the electromagnetic force will always provide a thrust to the magnet disc 23 when generated. The controller 4 is provided with a circuit breaker, which can detect the current size in the circuit and perform the disconnection action according to the current fluctuation. The rectification of the current can be realized through three-phase bridge rectification, and the direct current is smoothly outputted after filtering. At the same time, the current transformer or the Hall sensor is arranged to monitor the alternating current and the direct current, convert the current signal into a control signal, and feed back the detected current signal to the PLC controller, so as to proportionally adjust the size of the direct current when the alternating current fluctuates. The current sensing and triggering structure in the circuit breaker is the application of the prior art, and will not be described here.

[0026] Please refer to Figures 1-5 The on-off switching mechanism includes a delivery pipe 12 connected to the outer wall of the pump cylinder 7, the delivery pipe 12 is connected to the gas storage tank 11 and the high-pressure chamber, and the first electromagnetic valve 13 is fixed on the delivery pipe 12. The on-off switching mechanism also includes a pump pipe 14 connected to the outer wall of the pump cylinder 7, and the pump pipe 14 is connected to the air blowing nozzle 16 at the end, and the second electromagnetic valve 15 is fixed on the pump pipe 14.

[0027] Please refer to Figures 5-9 The energy storage triggering mechanism includes a second telescopic rod 21 fixed in the pump cylinder 7, and the second telescopic rod 21 is fixed at the end with a movable disc 24 connected with the first piston disc 22. The elastic assembly and the connecting assembly for storing energy and performing triggering action are arranged in the pump cylinder 7 and connected with the movable disc 24. The elastic assembly includes a support plate 10 fixed in the pump cylinder 7, and the spring 27 is sleeved on the second telescopic rod 21. The two ends of the spring 27 are respectively abutted with the support plate 10 and the movable disc 24. The connecting assembly includes a movable contact 25 fixed on the movable disc 24, and the support plate 10 is fixed with a static contact 26 abutting with the movable contact 25.

[0028] In detail, the pump cylinder 7 is provided with a control module, the on and off of the movable contact 25 and the fixed contact 26 can control the control module to work, so as to adjust the working state of the first electromagnetic valve 13 and the second electromagnetic valve 15, thereby controlling the conduction and plugging of the delivery pipe 12 and the pump pipe 14. The first piston disc 22 and the movable disc 24 divide the pump cylinder into two chambers. The chamber located on the side of the first piston disc 22 away from the movable disc 24 is the gas storage chamber, and the chamber located on the side of the movable disc 24 away from the first piston disc 22 is the balance chamber. In the initial state, when the current in the circuit is in the normal state, the electromagnetic force generated by the iron core 8 and the coil 9 is small, and the first electromagnetic valve 13 controls the delivery pipe 12 to be in the conduction state, so that the pump cylinder 7 and the gas storage tank 11 are in conduction with each other, and the second electromagnetic valve 15 is in the closed state, so that the pump pipe 14 is in the plugging state. At this time, the high-pressure arc-extinguishing gas in the gas storage tank 11 will be delivered to the high-pressure chamber through the delivery pipe 12, and under the action of gas pressure, the second piston disc 2201 moves away from the first piston disc 22, until the size of the first piston disc 22 and the second piston disc 2201 mutually fitted reaches the minimum value, that is, the size of the high-pressure chamber reaches the maximum value. Under the action of gas pressure, the electromagnetic thrust is overcome, and the position of the first piston disc 22 remains unchanged. The second telescopic rod can be divided into two parts, namely the fixed sleeve and the movable rod. The inner wall of the fixed sleeve is formed with a key groove, and the outer wall of the movable rod is fixedly provided with a key fitted with the key groove. Under the action of the key groove and the key, the movable rod can only slide along the axial direction of the fixed sleeve within a certain range. The movable disc 24 is in sliding sealing connection with the pump cylinder 7. When the current is in the normal state, the movable disc 24 is located at the end of the stroke towards the first piston disc 22, and the spacing between the movable disc 24 and the support plate 10 is maximum. Under the action of the movable disc 24, the size of the movable rod and the fixed sleeve mutually fitted is minimum. The elongation of the spring 27 in the natural state is greater than the spacing between the movable disc 24 and the support plate 10. Therefore, the spring 27 is in the pre-compressed state, and always provides a thrust to the movable disc 24 towards the first piston disc 22. In this state, the movable disc 24 is in close contact with the first piston disc 22. Therefore, the movable disc 24 can limit the position of the first piston disc 22. Only when the thrust received by the first piston disc 22 overcomes the elastic force of the spring 27, the first piston disc 22 can move towards the movable disc 24. At this time, the movable contact 25 and the fixed contact 26 are in the separated state.

[0029] When the current in the circuit fluctuates, the electromagnetic force generated by the core 8 and the coil 9 increases, so that the thrust acting on the magnet disc 23 increases. Due to the fact that the thrust is smaller than the elastic force of the spring 27, the second piston disc 2201 is driven to move towards the first piston disc 22, so that the size of the high-pressure chamber is reduced, thereby pumping the gas in the high-pressure chamber back into the gas storage tank 11. The gas pressure in the high-pressure chamber will rise until it reaches a balance state with the thrust, and the position of the second piston disc 2201 will no longer change. When the current returns to the normal value, the gas pressure controls the reset of the second piston disc 2201. In this way, under the action of the automatic accommodation of the second piston disc 2201, a certain thrust can be provided to the second piston disc 2201 by the arc extinguishing gas, so as to realize adaptive adjustment of the force acting on the second piston disc 2201 according to the fluctuation of the current, thereby avoiding the problem that the arc extinguishing gas continuously enters or is discharged from the pump cylinder 7 due to fluctuations caused by the separate setting of the first piston disc 22 or the second piston disc 2201. When a short circuit or overload occurs in the circuit, the current in the circuit will quickly rise, and the current flowing through the coil 9 will also rise. Under the action of the coil 9 and the core 8, the electromagnetic force generated will quickly increase, thereby providing an increased thrust to the magnet disc 23. At this time, the thrust will first overcome the reaction force provided by the pressure in the high-pressure chamber, so that the second piston disc 2201 moves to the end of the stroke towards the first piston disc 22, and then continues to overcome the elastic force of the spring 27 and drives the first piston disc 22 to move, thereby driving the movable disc 24 to move towards the support plate 10, so that the spring 27 is compressed. At the same time, the movable disc 24 also drives the movable contact 25 to move towards the stationary contact 26. The first electromagnetic valve 13 is normally open, and the second electromagnetic valve 15 is normally closed. When the second piston disc 2201 moves to the misaligned position with the delivery pipe 12, the arc extinguishing gas in the gas storage tank 11 will enter the storage chamber through the delivery pipe 12, so that the pressure in the storage chamber rises. In this way, the thrust provided by the arc extinguishing gas in the high-pressure chamber to the second piston disc 2201 away from the first piston disc 22 will be converted into a thrust pushing the second piston disc 2201 towards the first piston disc 22, thereby synchronously driving the movable disc 24 to move. When the movable contact 25 moves to the abutting position with the stationary contact 26, the circuit breaker works, so that the circuit is disconnected, and the electromagnetic force disappears. At the same time, the movable contact 25 and the stationary contact 26 control the first electromagnetic valve 13 and the second electromagnetic valve 15 to work through the control module, so that the delivery pipe 12 is blocked and the pump pipe 14 is opened.The moving contact 25 and the static contact 26 are electrically connected with a control power supply, the control power supply is used for controlling the power-on state of the first electromagnetic valve 13 and the second electromagnetic valve 15, and for this, before the moving contact 25 and the static contact 26 are in contact, the first electromagnetic valve 13 is in a power-off open state, and the second electromagnetic valve 15 is in a power-off closed state; when the moving contact 25 and the static contact 26 are in contact, the control power supply works, controls the first electromagnetic valve 13 to be powered on and closed, so that the conveying pipe 12 is blocked, at the same time, controls the second electromagnetic valve 15 to be powered on and opened, so that the pump gas pipe 14 is opened, and the first electromagnetic valve 13 and the second electromagnetic valve 15 are both provided with a delay relay, which can control the first electromagnetic valve 13 and the second electromagnetic valve 15 to be powered off when the moving contact 25 and the static contact 26 are separated and the first piston disc 22 is reset, which is the application of the prior art, and the present application will not be described here.

[0030] Subsequently, the spring 27 is elastically released and pushes the movable disc 24 to move quickly towards the initial position, thereby driving the first piston disc 22 and the second piston disc 2201 to move, so that the arc extinguishing gas in the gas storage chamber is in a pressurized state and is delivered to the blowing nozzle 16 through the pump gas pipe 14, the blowing nozzle 16 can spray high-pressure arc extinguishing gas in the arc generation area, under the action of the arc extinguishing gas, not only can the effect of temperature reduction and arc extinguishing be achieved, but also the shock wave generated by the high temperature of the arc can be resisted, and the high-temperature heat generated by the arc can be guided to flow, preventing the problem of damage to the parts in the cabinet 1 caused by the accumulation of high-temperature heat.

[0031] When the arc extinguishing is completed, the first piston disc 22 and the second piston disc 2201 are reset, at this time, the first electromagnetic valve 13 controls the conveying pipe 12 to be opened again, and the second electromagnetic valve 15 controls the pump gas pipe 14 to be blocked again, so as to realize the effect of automatic resetting of the entire arc extinguishing system and completing the preparation work when the arc extinguishing action is executed next time.

[0032] Please refer to Figure 4 、 Figure 5 , the pump cylinder 7 is communicated with the absorption pipe 17 and the gas delivery pipe 18, the gas delivery pipe 18 is connected with the gas storage tank 11, the first telescopic rod 19 is fixed in the gas storage tank 11, and the end of the first telescopic rod 19 is fixed with a sealing disc 20 which is in sliding sealing connection with the gas storage tank 11.

[0033] Further, the gas tank 11 stores the arc extinguishing gas, the sealing disc 20 divides the gas tank 11 into two chambers, namely a first chamber and a second chamber, the arc extinguishing gas is stored in the first chamber, and the second chamber is filled with air, in the initial state, the air pressure in the first chamber and the second chamber is balanced, so that the position of the sealing disc 20 in the gas tank 11 does not change; the pump cylinder 7 is provided with two one-way valves, one of which is connected with the suction pipe 17, and the other is connected with the air supply pipe 18, so that the external gas can only enter the balance chamber through the suction pipe 17, and then be pumped into the second chamber through the air supply pipe 18; when the circuit is short-circuited or overloaded, the current will increase, so that the movable disc 24 moves towards the support plate 10, at this time, the arc extinguishing gas in the gas tank 11 will enter the storage chamber, so that the air pressure in the first chamber decreases, when the movable disc 24 moves, the size of the balance chamber decreases, so that the pressure in the balance chamber increases, under the action of the pressure, the air in the balance chamber is pushed into the second chamber through the air supply pipe 18, so as to increase the pressure in the second chamber, under the action of the pressure difference, the sealing disc 20 moves until the pressure in the first chamber and the second chamber is balanced again; when the circuit is opened, the electromagnetic force disappears, under the action of the spring 27, the movable disc 24 is reset, the size of the balance chamber increases, so that the pressure in the balance chamber decreases, under the action of the pressure, the external air is sucked into the balance chamber through the suction pipe 17, so as to ensure the constant pressure in the balance chamber.

[0034] Preferably, when the movable disc 24 moves, the volume change of the storage chamber is the amount of gas delivered from the gas tank 11 to the pump cylinder 7, and through the change of the pressure in the balance chamber, the air can be automatically pumped into the second chamber, so as to ensure that after the arc extinguishing gas is discharged from the gas tank 11, the position of the sealing disc 20 is automatically adjusted under the pressure of the second chamber, so that the first chamber is always within a certain pressure range, thereby ensuring that the amount of subsequent pumped arc extinguishing gas is sufficient.

[0035] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0036] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. An intelligent AC high voltage switchgear with arc flash protection, comprising: The cabinet body, and the support and the fixing plate fixed in the cabinet body, the support is provided with the electric control structure, characterized by further comprising: the pump cylinder is fixed on the fixed plate, the pump cylinder is fixed with the gas storage tank for storing high pressure arc extinguishing gas, the first piston disc is connected in the pump cylinder, the first piston disc is connected with the second piston disc, the second piston disc is also connected with the pump cylinder wall, the first piston disc and the second piston disc and the pump cylinder form a high pressure chamber, the pump cylinder is provided with the switch mechanism, the switch mechanism can pump the high pressure arc extinguishing gas in the gas storage tank into the high pressure chamber, so as to constrain the position of the first piston disc when the current fluctuates, the energy storage trigger mechanism is arranged in the pump cylinder, the energy storage trigger mechanism can adjust the switch state of the pump cylinder through the switch mechanism when the first piston disc slides along the pump cylinder, so as to spray the arc extinguishing gas to the arc area.

2. The intelligent AC high-voltage switch cabinet of claim 1, wherein, The switch mechanism includes a delivery pipe connected to the outer wall of the pump cylinder, the delivery pipe is connected with the gas storage tank and the high pressure chamber, and the first electromagnetic valve is fixed on the delivery pipe.

3. The intelligent AC high-voltage switch cabinet of claim 2, wherein, The switch mechanism further includes a pump pipe connected to the outer wall of the pump cylinder, and the pump pipe is connected with the gas nozzle, and the second electromagnetic valve is fixed on the pump pipe.

4. The intelligent AC high-voltage switch cabinet of claim 1, wherein, The energy storage trigger mechanism includes a second telescopic rod fixed in the pump cylinder, and the second telescopic rod is fixed with a movable disc connected with the first piston disc, and further includes an elastic component and a connecting component arranged in the pump cylinder and connected with the movable disc, for storing energy and executing trigger action.

5. The intelligent AC high voltage switchgear with arc-proof power distribution according to claim 4, characterized in that, The elastic component includes a support plate fixed in the pump cylinder, and a spring is sleeved on the second telescopic rod, and the two ends of the spring are respectively abutted with the support plate and the movable disc.

6. The intelligent AC high-voltage switch cabinet of claim 5, wherein, The connecting component includes a movable contact fixed on the movable disc, and a static contact fixed on the support plate and abutting with the movable contact.

7. The intelligent AC high voltage switchgear with arc-proof power distribution according to claim 1, characterized in that, The pump cylinder is connected with the absorption pipe and the gas pipe, and the gas pipe is connected with the gas storage tank.

8. The intelligent AC high voltage switchgear with arc-proof power distribution according to claim 1, characterized in that, The first telescopic rod is fixed in the gas storage tank, and the end of the first telescopic rod is fixed with a sealing disc connected with the gas storage tank.

9. The intelligent AC high voltage switchgear with arc-proof power distribution according to claim 1, characterized in that, The fixed plate is fixed with an iron core, and a coil is wound on the iron core, and the coil can generate electromagnetic force in cooperation with the iron core when energized.

10. The intelligent AC high voltage switchgear with arc-proof power distribution according to claim 1, characterized in that, The second piston disc is fixed with a magnet disc repelling the electromagnetic force.

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