Intelligent alternating current high voltage switch cabinet for power distribution with arc overflow prevention

Abstract

The application relates to the technical field of switch cabinets, in particular to an intelligent power distribution alternating-current high-voltage switch cabinet capable of preventing electric arc overflow, which comprises a cabinet body, a support and a fixing plate fixed in the cabinet body, and an electric control structure arranged on the support; a pump cylinder fixed on the fixing plate, a gas storage tank 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 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, and a conduction switching mechanism arranged on the pump cylinder; and an energy storage triggering mechanism arranged in the pump cylinder. The application can constrain the position of the first piston disc when the current fluctuates, release the constraint on the first piston disc when the current exceeds the set value, and under the action of the energy storage triggering mechanism, high-pressure arc extinguishing gas is rapidly sprayed in the electric arc area to perform efficient arc extinguishing action.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, specifically to an intelligent AC high-voltage switchgear for power distribution that prevents arc leakage. Background Technology

[0002] AC high-voltage switchgear is a key piece of equipment in power systems used for distributing, controlling, and protecting high-voltage electrical energy. It is widely used in substations, industrial and mining enterprises, power plants, and other places.

[0003] In AC high-voltage switchgear, preventing arcing (arc jetting) is a critical measure to ensure the safety of equipment and personnel. Arcing faults can be caused by short circuits, overloads, and other conditions, and their high temperatures and shock waves can cause serious damage.

[0004] Existing methods for preventing arc leakage typically employ arc-extinguishing grids. These grids divide a long arc into multiple shorter arcs, which are then extinguished using the near-cathode effect or voltage drop across the electrode. However, this method only extinguishes the arc and cannot quickly cool the high temperature generated by the arc. Over long-term use, this can easily lead to grid damage. To address this, air-blowing arc extinguishing can be used to cool the high temperature of the arc. Air blows force cooling and lengthen the arc path. However, air-blowing arc extinguishing requires mechanical compression of the gas after the arc is generated, resulting in a slow response time. Furthermore, as the amount of arc-extinguishing gas in the storage tank decreases, the gas becomes diluted, reducing the amount of gas subsequently sprayed and leading to poor arc extinguishing effectiveness. Summary of the Invention

[0005] The purpose of this invention is to provide an intelligent AC high-voltage switchgear for power distribution that prevents arc leakage, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intelligent AC high-voltage switchgear for preventing arc leakage, comprising: a cabinet, and a bracket and a fixing plate fixed inside the cabinet, wherein an electrical control structure is provided on the bracket; further comprising: a pump cylinder fixed on the fixing plate, wherein a gas storage tank for storing high-pressure arc-extinguishing gas is fixed on the pump cylinder; a first piston disc slidably and sealingly connected inside the pump cylinder, wherein a second piston disc is slidably connected to the first piston disc, and the second piston disc is also slidably and sealingly connected to the inner wall of the pump cylinder, wherein a high-pressure chamber is formed between the first piston disc and the second piston disc and the pump cylinder; a conduction switching mechanism is provided on the pump cylinder, which can pump 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; and an energy storage triggering mechanism disposed inside the pump cylinder, wherein the energy storage triggering mechanism can adjust the conduction state of the pump cylinder through the conduction switching mechanism when the first piston disc slides along the axial direction of the pump cylinder to spray the arc-extinguishing gas into the arc region.

[0007] As a further aspect of the present invention: the conduction switching mechanism includes a delivery pipe connected to the outer wall of the pump cylinder, the delivery pipe being connected to the air storage tank and the high-pressure chamber, and a first solenoid valve being fixed on the delivery pipe.

[0008] As a further embodiment of the present invention: the switching mechanism further includes a pumping pipe connected to the outer wall of the pump cylinder, an air nozzle being connected to the end of the pumping pipe, and a second solenoid valve being fixed on the pumping pipe.

[0009] As a further embodiment of the present invention: the energy storage triggering mechanism includes a second telescopic rod fixed inside the pump cylinder, and a movable disc fixedly connected to the first piston disc at the end of the second telescopic rod; it also includes an elastic component and a connecting component disposed inside the pump cylinder and connected to the movable disc for storing energy and performing triggering actions.

[0010] As a further embodiment of the present invention: the elastic component includes a support plate fixed inside the pump cylinder, and a spring is sleeved on the second telescopic rod, with the two ends of the spring abutting against the support plate and the movable disc respectively.

[0011] As a further embodiment of the present invention: the connecting component includes a moving contact fixed on the movable disk, and a stationary contact that abuts and cooperates with the moving contact is fixed on the support plate.

[0012] As a further embodiment of the present invention: the pump cylinder is connected to an absorption pipe and an air delivery pipe, and the air delivery pipe is connected to the air storage tank.

[0013] As a further embodiment of the present invention: a first telescopic rod is fixed inside the gas storage tank, and a sealing disc that is slidably and sealingly connected to the gas storage tank is fixed at the end of the first telescopic rod.

[0014] As a further embodiment of the present invention: an iron core is fixed on the fixing plate, and a coil is wound on the iron core. When the coil is energized, it can generate electromagnetic force in conjunction with the iron core.

[0015] As a further aspect of the present invention: a magnet disk that repels electromagnetic forces is fixed on the second piston disk.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: This application can suppress the reciprocating movement of the first piston disc caused by current fluctuations through the action of air pressure pushing. At the same time, it automatically adjusts 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 pushes the second piston disc to move towards the first piston disc, thereby increasing the pressure in the high-pressure chamber to overcome the electromagnetic thrust. In this way, the force on the second piston disc is adaptively adjusted according to the fluctuation of the current, avoiding the continuous entry or exit of arc-extinguishing gas into or out of the pump cylinder due to fluctuations caused by the independent setting of the first or second piston disc. The problem is that if an overload or short circuit occurs in the circuit, the current will increase. When the electromagnetic force pushes the movable disk to the end of its stroke, the circuit is disconnected, the spring is released elastically, and the movable disk moves quickly back to the initial position, thereby driving the first piston disk and the second piston disk to move. This pressurizes the arc-extinguishing gas in the gas storage chamber and delivers it to the air nozzle through the pump pipe. The air nozzle can spray the high-pressure arc-extinguishing gas into the arc-generating area. Under the action of the arc-extinguishing gas, it can not only cool down and extinguish the arc, but also resist the shock wave generated by the high temperature of the arc, and guide the flow of high-temperature heat generated by the arc, preventing the accumulation of high-temperature heat from damaging the components inside the cabinet.

[0017] When the movable disc moves, the resulting change in the volume of the gas storage chamber is the amount of gas delivered from the gas storage tank to the pump cylinder. By balancing the pressure changes in the chamber, air can be automatically pumped into the second chamber. This ensures that after each discharge of arc-extinguishing gas from the gas storage tank, 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 arc-extinguishing gas pumped in the future is sufficient. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of an embodiment of an intelligent AC high-voltage switchgear for power distribution to prevent arc leakage;

[0019] Figure 2 A schematic diagram of the structure of a smart AC high-voltage switchgear for power distribution, designed to prevent arc leakage, from another angle in one embodiment.

[0020] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0021] Figure 4 A schematic diagram of the structure of the pump cylinder, air tank, and conduction switching mechanism in one embodiment of an intelligent AC high-voltage switchgear for power distribution to prevent electric arc leakage;

[0022] Figure 5 A schematic cross-sectional view of the pump cylinder and air tank in one embodiment of an intelligent AC high-voltage switchgear for power distribution designed to prevent arc leakage;

[0023] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0024] Figure 7 A schematic diagram of the structure of the first piston plate, the second piston plate, and a portion of the energy storage triggering mechanism in one embodiment of a smart AC high-voltage switchgear for preventing electric arc leakage;

[0025] Figure 8 A schematic diagram of the structure of the second telescopic rod, the first piston disc, the second piston disc, and the energy storage triggering mechanism in one embodiment of a power distribution intelligent AC high-voltage switchgear for preventing electric arc leakage;

[0026] Figure 9 An exploded structural diagram of the first piston disc, second piston disc, magnet disc, and part of the energy storage triggering mechanism in one embodiment of a power distribution intelligent AC high-voltage switchgear designed to prevent arc leakage;

[0027] Figure 10 A schematic diagram of the core and coil structure in one embodiment of an intelligent AC high-voltage switchgear for power distribution designed to prevent arc leakage.

[0028] In the diagram: 1. Cabinet; 2. Bracket; 3. Fixing plate; 4. Controller; 5. First contact plate; 6. Second contact plate; 7. Pump cylinder; 8. Iron core; 9. Coil; 10. Support plate; 11. Air tank; 12. Delivery pipe; 13. First solenoid valve; 14. Pump pipe; 15. Second solenoid valve; 16. Air nozzle; 17. Absorption pipe; 18. Air delivery 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 Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0031] Please see Figures 1-10 In this embodiment of the invention, a smart AC high-voltage switchgear for preventing arc leakage includes: a cabinet 1, a bracket 2 and a fixing plate 3 fixed inside the cabinet 1, an electrical control structure on the bracket 2 including a controller 4 fixed on the bracket 2, a first contact piece 5 fixed on the controller 4, and a second contact piece 6 fixed on the bracket 2 that abuts against the first contact piece 5; it also includes: a pump cylinder 7 fixed on the fixing plate 3, a gas storage tank 11 for storing high-pressure arc-extinguishing gas fixed on the pump cylinder 7; a first piston disc 22 slidably and sealingly connected inside the pump cylinder 7, and a second piston disc 2201 slidably connected to the first piston disc 22. The second piston disc 2201 is also slidably and sealingly connected to the inner wall of the pump cylinder 7. A high-pressure chamber is formed between the first piston disc 22 and the second piston disc 2201 and the pump cylinder 7. A conduction switching mechanism is provided on the pump cylinder 7. The conduction switching mechanism can pump the high-pressure arc-extinguishing gas in the gas storage tank 11 into the high-pressure chamber to constrain the position of the first piston disc 22 when the current fluctuates. An energy storage triggering mechanism is provided in the pump cylinder 7. When the first piston disc 22 slides along the axial direction of the pump cylinder 7, the energy storage triggering mechanism can adjust the conduction state of the pump cylinder 7 through the conduction switching mechanism to spray the arc-extinguishing gas into the arc region.

[0032] An iron core 8 is fixed on the fixing plate 3, and a coil 9 is wound on the iron core 8. When the coil 9 is energized, it can generate electromagnetic force in conjunction with the iron core 8. A magnet disc 23 that repels electromagnetic force is fixed on the second piston disc 2201.

[0033] Specifically, to prevent arc leakage and ensure the safe use of the switchgear, when an arc is generated, it needs to be extinguished promptly. Since the switching mechanism controls the pump cylinder 7 and the gas tank 11 to be interconnected, high-pressure arc-extinguishing gas will enter the high-pressure chamber. Under the action of gas pressure, the second piston disc 2201 moves away from the first piston disc 22, maximizing the size of the high-pressure chamber. When the first contact piece 5 and the second contact piece 6 come into contact, the current is connected, and when the current is within the normal range, the current flowing through the coil 9 will not be excessive. Therefore, the iron core 8 and... The electromagnetic force generated by the interaction of coils 9 is relatively small, and the magnetic poles of this electromagnetic force are the same as those of the magnetic disk 23. Therefore, the electromagnetic force will provide a certain repulsive force to the magnetic disk 23. This repulsive force cannot overcome the constraint force of the air pressure on the second piston disk 2201. Thus, the position of the first piston disk 22 will not change. If the current in the circuit fluctuates, and the fluctuation range is within the normal value, the electromagnetic force will push the second piston disk 2201 towards the first piston disk 22, increasing the pressure in the high-pressure chamber to overcome the electromagnetic thrust. In this way, through the air pressure provided by the high-pressure arc-extinguishing gas, it is possible to... This prevents the first piston disc 22 from reciprocating during current fluctuations, thus ensuring that the arc-extinguishing gas does not overflow. If an overload or short circuit occurs in the circuit, the current will increase. At this time, the circuit breaker will operate and control the first contact 5 and the second contact 6 to separate, so that the circuit is in an open state. When the first contact 5 and the second contact 6 are separated, an electric arc will be generated. At the same time, before the circuit is broken, the current flowing through the coil 9 is large, resulting in an increase in the generated electromagnetic force. This electromagnetic force will overcome the constraint of the gas pressure on the second piston disc 2201 and push the first piston disc 2201. The sliding motion allows the high-pressure arc-extinguishing gas to enter the pump cylinder 7. The first piston disc 22 also drives the energy storage trigger mechanism to move. When the first piston disc 22 moves to the end of its stroke, the energy storage trigger mechanism controls the gas storage tank 11 to no longer be connected to the pump cylinder 7 through the conduction switching mechanism. At the same time, the conduction switching mechanism, in conjunction with the energy storage trigger mechanism, quickly sprays 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, it can both cool down and extinguish the arc, and guide the flow of the heat source generated by the arc to prevent heat accumulation from damaging the components inside the cabinet 1.

[0034] The circuit breaker incorporates a built-in current sensor and triggering structure, capable of detecting the current in the first contact piece 5 and the second contact piece 6, and controlling their connection / disconnection based on the current magnitude. In the switchgear circuit, alternating current (AC) can be rectified to direct current (DC). Therefore, the current flowing through coil 9 is DC, and its magnitude is matched to the AC current in the switchgear according to a certain ratio. The current flow direction does not change with the winding direction of coil 9, and the resulting electromagnetic force's magnetic pole direction does not change. The magnetic poles of the magnet disk 23 are the same as the electromagnetic force's magnetic poles; therefore, when the electromagnetic force is generated, it will always be supplied to the magnet. The iron disc 23 provides thrust, while the controller 4 is equipped with a circuit breaker that can detect the current magnitude in the circuit and perform a circuit breaking action according to current fluctuations. The current rectification can be achieved through a three-phase bridge rectifier and after filtering, the DC current is output smoothly. At the same time, a current transformer or Hall sensor is set to monitor AC and DC currents, convert them into control signals, and feed the detected current signals back to the PLC controller so that the DC current magnitude can be adjusted proportionally when the AC current fluctuates. The built-in current sensing and triggering structure of the circuit are applications of existing technology and will not be described in detail in this application.

[0035] Please see Figures 1-5 The switching mechanism includes a delivery pipe 12 connected to the outer circumference of the pump cylinder 7. The delivery pipe 12 is connected to the air storage tank 11 and the high-pressure chamber. A first solenoid valve 13 is fixed on the delivery pipe 12. The switching mechanism also includes a pump pipe 14 connected to the outer circumference of the pump cylinder 7. An air nozzle 16 is connected to the end of the pump pipe 14. A second solenoid valve 15 is fixed on the pump pipe 14.

[0036] Please see Figures 5-9 The energy storage triggering mechanism includes a second telescopic rod 21 fixed inside the pump cylinder 7, with a movable disc 24 fixedly connected to the first piston disc 22 at the end of the second telescopic rod 21; it also includes an elastic component and a connecting component disposed inside the pump cylinder 7 and connected to the movable disc 24 for storing energy and performing triggering actions. The elastic component includes a support plate 10 fixed inside the pump cylinder 7, and a spring 27 is sleeved on the second telescopic rod 21. The two ends of the spring 27 abut against the support plate 10 and the movable disc 24, respectively. The connecting component includes a moving contact 25 fixed on the movable disc 24, and a stationary contact 26 fixed on the support plate 10 that abuts against the moving contact 25.

[0037] In detail, the pump cylinder 7 is equipped with a control module. The connection and disconnection of the moving contact 25 and the stationary contact 26 can control the operation of the control module to adjust the working state of the first solenoid valve 13 and the second solenoid valve 15, thereby controlling the opening and closing of the delivery pipe 12 and the pump pipe 14. The first piston plate 22 and the movable plate 24 divide the pump cylinder into two chambers. The chamber located on the side of the first piston plate 22 away from the movable plate 24 is the air storage chamber, and the chamber located on the side of the movable plate 24 away from the first piston plate 22 is the balance chamber. In the initial state, when the current in the circuit is in a normal state, the electricity generated by the iron core 8 and the coil 9... The magnetic force is relatively small, and the first solenoid valve 13 controls the delivery pipe 12 to be in a conductive state, making the pump cylinder 7 and the gas tank 11 interconnected. The second solenoid valve 15 is in a closed state, making the pump pipe 14 blocked. At this time, the high-pressure arc-extinguishing gas in the gas tank 11 will be delivered to the high-pressure chamber through the delivery pipe 12. Under the action of air 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 fitting together reaches the minimum value, that is, the size of the high-pressure chamber reaches the maximum value. Under the action of air pressure, the electromagnetic thrust is overcome. The first piston disc 22 remains in the same position. The second telescopic rod can be divided into two parts: a fixed sleeve and a movable rod. A keyway is formed on the inner wall of the fixed sleeve, and a key that fits into the keyway is fixed on the outer wall of the movable rod. Under the action of the keyway 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 and the pump cylinder 7 are in a sliding sealed connection state. When the current is normal, the movable disc 24 is located at the end of its stroke towards the first piston disc 22, and the distance between the movable disc 24 and the support plate 10 is at its maximum. Under the action of the movable disc 24, the movable rod and the fixed sleeve are in a sliding sealed connection state. The interlocking dimensions are minimal, and the elongation of spring 27 in its natural state is greater than the distance between movable disk 24 and support plate 10. Therefore, spring 27 is in a pre-compressed state and always provides a thrust to movable disk 24 toward the direction of the first piston disk 22. In this state, movable disk 24 and first piston disk 22 are in contact with each other. Therefore, movable disk 24 can restrict the position of first piston disk 22. Only when the thrust on first piston disk 22 overcomes the elastic force of spring 27 can first piston disk 22 move toward movable disk 24. At this time, moving contact 25 and stationary contact 26 are in a separated state.

[0038] When the current in the circuit fluctuates, the electromagnetic force generated by the iron core 8 and coil 9 increases, which increases the thrust acting on the magnetic disk 23. Since this thrust is less than the elastic force of the spring 27, under the action of the thrust, the second piston disk 2201 is driven to move towards the first piston disk 22, reducing the size of the high-pressure chamber. This pumps the gas in the high-pressure chamber back into the gas storage tank 11, and the gas pressure in the high-pressure chamber will increase until it reaches a balance with the thrust. The position of the second piston disk 2201 no longer changes. When the current returns to normal, the gas pressure controls the second piston disk 2201 to reset. In this way, the second piston disk 2201... Under the automatic yielding function of 201, a certain thrust can be provided to the second piston disk 2201 through the arc-extinguishing gas, thereby realizing adaptive adjustment of the force on the second piston disk 2201 according to the fluctuation of the current, avoiding the problem of arc-extinguishing gas continuously entering or leaving the pump cylinder 7 due to fluctuations caused by the separate setting of the first piston disk 22 or the second piston disk 2201; when a short circuit or overload occurs in the circuit, the current in the circuit will increase rapidly, and the current flowing through the coil 9 will also increase. Under the action of the coil 9 and the iron core 8, the generated electromagnetic force will increase rapidly, thereby increasing the thrust provided to the magnet disk 23. At this time, the The thrust will first overcome the reaction force provided by the pressure in the high-pressure chamber, causing the second piston disc 2201 to move to the end of its stroke towards the first piston disc 22. Then, it will continue to overcome the elastic force of the spring 27 and push the first piston disc 22 to move, thereby causing the movable disc 24 to move towards the support plate 10, compressing the spring 27. Simultaneously, the movable disc 24 will also cause the moving contact 25 to move towards the stationary contact 26. The first solenoid valve 13 is normally open, and the second solenoid valve 15 is normally closed. When the second piston disc 2201 moves to a position misaligned with the delivery pipe 12, the arc-extinguishing gas in the gas storage tank 11 will flow through the delivery pipe 1... 2. When the gas enters the gas storage chamber, the pressure inside the gas storage chamber increases. In response, 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 that pushes the second piston disc 2201 toward the first piston disc 22. This, in conjunction with the electromagnetic force, synchronously pushes the movable disc 24 to move. When the moving contact 25 moves to the position of contacting the stationary contact 26, the circuit breaker operates, causing the circuit to break and the electromagnetic force to disappear. At the same time, the moving contact 25 and the stationary contact 26 control the first solenoid valve 13 and the second solenoid valve 15 to operate through the control module, causing the delivery pipe 12 to be blocked and the pump pipe 14 to be open.The moving contact 25 and the stationary contact 26 are electrically connected to the control power supply, which controls the energization state of the first solenoid valve 13 and the second solenoid valve 15. Before the moving contact 25 contacts the stationary contact 26, the first solenoid valve 13 is de-energized and conducting, and the second solenoid valve 15 is de-energized and closed. When the moving contact 25 contacts the stationary contact 26, the control power supply operates, energizing and closing the first solenoid valve 13 to block the delivery pipe 12. Simultaneously, it energizes and opens the second solenoid valve 15 to open the pump pipe 14. Both the first and second solenoid valves 13 and 15 are equipped with time-delay relays, which de-energize the first and second solenoid valves 13 and 15 after the moving contact 25 separates from the stationary contact 26 and the first piston disc 22 resets. This is an application of existing technology and will not be elaborated upon in this application.

[0039] Subsequently, the spring 27 is released elastically and pushes the movable disk 24 to move rapidly toward the initial position, thereby driving the first piston disk 22 and the second piston disk 2201 to move. This pressurizes the arc-extinguishing gas in the gas storage chamber and delivers it to the air nozzle 16 through the pump pipe 14. The air nozzle 16 can spray the high-pressure arc-extinguishing gas into the arc-generating area. Under the action of the arc-extinguishing gas, it can not only cool down and extinguish the arc, but also resist the shock wave generated by the high temperature of the arc, and guide the flow of high-temperature heat generated by the arc, preventing the accumulation of high-temperature heat from damaging the components inside the cabinet 1.

[0040] After the arc extinguishing is completed, the first piston disc 22 and the second piston disc 2201 are reset. At this time, the first solenoid valve 13 controls the delivery pipe 12 to be opened again, and the second solenoid valve 15 controls the pump pipe 14 to be blocked again, so as to achieve the effect of the entire arc extinguishing system automatically resetting and completing the preparation work when the arc extinguishing action is performed next time.

[0041] Please see Figure 4 , Figure 5 The pump cylinder 7 is connected to an absorption pipe 17 and an air delivery pipe 18. The air delivery pipe 18 is connected to the air storage tank 11. A first telescopic rod 19 is fixed inside the air storage tank 11. A sealing disc 20 that is slidably and sealingly connected to the air storage tank 11 is fixed at the end of the first telescopic rod 19.

[0042] Furthermore, the gas storage tank 11 stores the gas used for arc extinguishing. The sealing plate 20 divides the gas storage tank 11 into two chambers, namely the first chamber and the second chamber. The first chamber stores the arc-extinguishing gas, and the second chamber contains air. Initially, the gas pressure in the first and second chambers is balanced, so that the position of the sealing plate 20 in the gas storage tank 11 does not change. Two one-way valves are installed on the pump cylinder 7. One one-way valve is connected to the absorption pipe 17, and the other one-way valve is connected to the gas delivery pipe 18, so that external gas can only enter the balance chamber through the absorption pipe 17, and then be pumped to the second chamber through the gas delivery pipe 18. When a short circuit or overload occurs in the circuit, the current will increase, causing the movable plate 24 to move towards the support plate 10. The arc-extinguishing gas in the gas storage tank 11 will enter the gas storage chamber, causing the air pressure in the first chamber to decrease. When the movable plate 24 moves, the size of the balance chamber decreases, causing the pressure in the balance chamber to increase. Under the action of the pressure, the air in the balance chamber is pushed into the second chamber through the air supply pipe 18, thereby increasing the pressure in the second chamber. Under the action of the pressure difference, the sealing plate 20 moves until the pressure in the first chamber and the second chamber reach balance again. When the circuit is turned on, the electromagnetic force disappears, and under the action of the spring 27, the movable plate 24 is reset, the size of the balance chamber increases, and the pressure in the balance chamber decreases. Under the action of the pressure, outside air is drawn into the balance chamber through the absorption pipe 17 to ensure that the pressure in the balance chamber is constant.

[0043] Preferably, the change in volume of the gas storage chamber caused by the movement of the movable disc 24 is the amount of gas delivered from the gas storage tank 11 to the pump cylinder 7. By balancing the pressure change in the chamber, air can be automatically pumped into the second chamber to ensure that after each discharge of arc-extinguishing gas from the gas storage tank 11, the position of the sealing disc 20 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 arc-extinguishing gas pumped in the future is sufficient.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power distribution intelligent AC high-voltage switchgear with anti-arc spillage feature, comprising: The cabinet, as well as the brackets and fixing plates fixed inside the cabinet, with an electrical control structure installed on the brackets; Its characteristic is that it further includes: The pump cylinder is fixed on the fixed plate, and a gas storage tank for storing high-pressure arc-extinguishing gas is fixed on the pump cylinder. A first piston disc is slidably and sealed within the pump cylinder. A second piston disc is slidably connected to the first piston disc, and the second piston disc is also slidably and sealed with the inner wall of the pump cylinder. A high-pressure chamber is formed between the first piston disc, the second piston disc, and the pump cylinder. A switching mechanism is provided on the pump cylinder. The switching mechanism can pump 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 is disposed inside the pump cylinder. When the first piston disc slides along the axial direction of the pump cylinder, the energy storage triggering mechanism can adjust the conduction state of the pump cylinder through the conduction switching mechanism to spray the arc extinguishing gas to the arc area. The switching mechanism includes a delivery pipe connected to the outer wall of the pump cylinder, the delivery pipe being connected to the air storage tank and the high-pressure chamber, and a first solenoid valve being fixed on the delivery pipe; The switching mechanism also includes a pump pipe connected to the outer wall of the pump cylinder, an air nozzle connected to the end of the pump pipe, and a second solenoid valve fixed on the pump pipe. The energy storage triggering mechanism includes a second telescopic rod fixed inside the pump cylinder, and a movable disc fixedly connected to the first piston disc at the end of the second telescopic rod. It also includes an elastic component and a switching component disposed inside the pump cylinder and connected to the movable disc for storing energy and performing triggering actions; The elastic component includes a support plate fixed inside the pump cylinder, and a spring is sleeved on the second telescopic rod, with the two ends of the spring abutting against the support plate and the movable disc, respectively.

2. The intelligent AC high-voltage switchgear for preventing arc leakage as described in claim 1, characterized in that, The connection component includes a movable contact fixed on the movable disk, and a stationary contact that abuts against the movable contact is fixed on the support plate.

3. The intelligent AC high-voltage switchgear for preventing arc leakage as described in claim 1, characterized in that, The pump cylinder is connected to an absorption pipe and an air delivery pipe, and the air delivery pipe is connected to the air storage tank.

4. The intelligent AC high-voltage switchgear for preventing arc leakage as described in claim 1, characterized in that, A first telescopic rod is fixed inside the gas storage tank, and a sealing disc that is slidably and sealingly connected to the gas storage tank is fixed at the end of the first telescopic rod.

5. The intelligent AC high-voltage switchgear for preventing arc leakage as described in claim 1, characterized in that, An iron core is fixed on the fixing plate, and a coil is wound on the iron core. When the coil is energized, it can generate electromagnetic force in conjunction with the iron core.

6. The intelligent AC high-voltage switchgear for preventing arc leakage as described in claim 1, characterized in that, The second piston disc is fixed with a magnet disc that repels electromagnetic forces.

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