A dual-cavity isolated primary and secondary fusion circuit breaker

Abstract

The application discloses a double-cavity isolated primary and secondary fusion circuit breaker and relates to the technical field of circuit breakers, aiming to solve the technical problem of low functionality of the primary and secondary fusion circuit breaker, comprising a switching operation mechanism, a fixed sealing pole, a current transformer, an electromagnetic module, a first arc extinguishing mechanism and a second arc extinguishing mechanism. The first arc extinguishing mechanism and the second arc extinguishing mechanism are arranged. When the impact current passes, the first arc extinguishing mechanism is triggered to perform a reversible arc extinguishing action under the repulsive magnetic field, and is automatically reset to restore power supply after arc extinguishing. When the persistent short-circuit current passes, the second arc extinguishing mechanism performs irreversible fusing isolation, realizes quick arc extinguishing of the transient impact current and automatic restoration of power supply, simultaneously performs permanent isolation on the persistent short-circuit fault, and has the advantages of two-stage collaborative protection and strong functionality.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more specifically, to a dual-cavity isolated primary and secondary integrated circuit breaker. Background Technology

[0002] In power systems, circuit breakers bear the core protective responsibility of connecting and disconnecting normal load currents and rapidly interrupting short-circuit currents under fault conditions. With the development of intelligent distribution networks, primary and secondary integration technology, which deeply integrates primary main equipment with secondary sensing and control units, has become an important direction for improving power supply reliability and equipment intelligence.

[0003] Existing integrated primary and secondary circuit breakers use a vacuum interrupter chamber combined with a spring-operated mechanism for arc extinguishing. An electronic controller detects the fault current and drives the circuit breaker to trip. However, in practical applications, line faults fall into two categories: transient inrush currents caused by lightning strikes, induced overvoltages, or tree branches momentarily touching the line, and persistent short-circuit faults. While existing arc extinguishing methods can interrupt and extinguish these faults, the circuit is completely severed after interruption, requiring manual troubleshooting and reactivation or fuse replacement to restore power. For transient inrush currents, the duration is extremely short, and the line itself is not permanently damaged. The circuit can operate normally after the fault current disappears. However, due to the low functionality of existing circuit breakers, they cannot distinguish the nature of the fault. Even transient inrush currents caused by accidental factors such as accidental contact will still trigger the circuit breaker to trip, causing a power outage that requires manual intervention to restore power. Therefore, we propose a dual-chamber isolated integrated primary and secondary circuit breaker. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-cavity isolated primary and secondary integrated circuit breaker to solve the technical problem of low functionality of primary and secondary integrated circuit breakers.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a dual-cavity isolated primary and secondary fusion circuit breaker, including a tripping and closing operation mechanism, wherein a plurality of solid-sealed poles are uniformly installed on the top of the tripping and closing operation mechanism, and a current transformer is installed on one side of the solid-sealed poles, characterized in that an electromagnetic module, a first arc extinguishing mechanism and a second arc extinguishing mechanism are arranged in series from top to bottom in the solid-sealed poles. The electromagnetic module is used to generate a repulsive magnetic field when an electric current passes through it. The first arc-extinguishing mechanism is used to perform a reversible arc-extinguishing action triggered by the repulsive magnetic field induced by the instantaneous impact current; The first arc-extinguishing mechanism includes a fixed contact and a gas supply component. The fixed contact is fixedly connected to the output end of the electromagnetic module. A sliding column is slidably provided inside the gas supply component. A sliding cavity A is opened at the bottom end of the sliding column. The sliding cavity A is connected and cooperates with the output end of the gas supply component. A connecting tube and a magnetic ring are fixedly provided at the top end of the sliding column with an inner and outer structure. The top end of the connecting tube is inserted into the bottom end of the fixed contact. An insulating shaft is rotatably provided inside the connecting tube. A plurality of gas channels are provided on the insulating shaft that communicate and cooperate with the sliding cavity A. A fixed column is slidably connected to the bottom end of the sliding cavity A and is fixedly connected to the solid sealing pole. The bottom end of the fixed column and the bottom end of the sliding column are elastically connected by an elastic component. The second arc-extinguishing mechanism is triggered under the action of a continuous short-circuit current to perform irreversible fuse isolation and extinguish the arc. This invention designs a first and second arc-extinguishing mechanism. When an impact current caused by lightning, accidental contact, or other unexpected events passes through the magnetic coil, the repulsive magnetic field increases. The magnetic ring drives the sliding column to descend, overcoming the elastic force of the elastic component. The connecting tube separates from the fixed contact, forming an electric arc. Simultaneously, the sliding cavity A is misaligned with the output end of the gas replenishment component, reducing the volume of the cavity formed by the sliding cavity A and the top of the fixed column, and increasing the cavity air pressure. When the air channel connects with the sliding cavity A, the arc-extinguishing gas in the cavity rushes out from the air channel, rapidly dispersing the electric arc from bottom to top in a pulse form, achieving a rapid arc-extinguishing effect. After arc extinguishing, under the elastic force of the elastic component, the sliding column slides along the sliding groove to the initial position, allowing the top of the connecting tube to reconnect with the fixed contact, and the line automatically restores normal power supply. In the event of a continuous short circuit fault, irreversible fuse isolation and arc extinguishing are performed, completely isolating the line, thereby achieving dual-level coordinated protection of the line.

[0006] Preferably, the bottom end of the solid-sealed pole has a cavity, the top end of the cavity has a middle partition cavity, the top end of the middle partition cavity has an upper partition cavity, and a side through groove is formed on one side of the top of the middle partition cavity relative to the position of the current transformer.

[0007] Preferably, the electromagnetic module includes a protective shell, an upper connector A, and a lower connector A. The protective shell is fixed in the upper cavity, the upper connector A is fixed at the top of the sealed pole, the bottom end of the upper connector A passes through the protective shell and is fixed with a magnetic induction coil, the lower connector A is fixed at the bottom end of the protective shell, and the top end of the lower connector A is fixedly connected to the bottom end of the magnetic induction coil.

[0008] Preferably, the fixed contact is located at the top of the partition cavity, the bottom end of the lower connector A passes through the partition cavity and is fixedly connected to the top end of the fixed contact, the input end of the current transformer extends through the side slot into the partition cavity and is fixedly connected to the fixed contact, the bottom end of the fixed contact has an interface, and the top end of the connecting tube is plugged into the interface.

[0009] Preferably, the gas replenishment component includes a column, which is located below the fixed contact and fixedly connected to the diaphragm cavity. A sliding groove is provided at the center of the column, and a gas storage ring cavity is provided inside the column. A plurality of air holes A are uniformly provided on the surface of the sliding groove, which communicates with the gas storage ring cavity. An air pipe communicating with the gas storage ring cavity is fixed on the column, and the air pipe passes through the solid-sealed pole and is fixedly provided with an air connector.

[0010] Preferably, the sliding column is slidably disposed on the sliding groove, and a plurality of air holes B communicating with the sliding cavity A are evenly opened on the bottom surface of the sliding column. The plurality of air holes B are respectively connected and cooperate with the plurality of air holes A. An installation groove is opened at the top of the sliding column, the magnetic ring is fixed on the installation groove, the connecting pipe is fixed at the center position of the installation groove, and a plurality of air holes C are opened at the center position of the installation groove. The bottom ends of the plurality of air channels are respectively connected and cooperate with the top ends of the plurality of air holes C.

[0011] Preferably, the bottom end of the insulating shaft is fixed with a rod that is rotatably connected to the mounting groove, and a plurality of air channels are evenly arranged circumferentially. The air channels have a spiral structure, and the spiral radius of the air channels gradually decreases from bottom to top, so that the tops of the plurality of air channels converge and connect.

[0012] Preferably, the bottom end of the fixed column is fixedly provided with a base, the base is fixedly connected to the bottom end of the diaphragm cavity, the top end of the fixed column is provided with a circular groove, the bottom end of the circular groove is provided with a sliding cavity B, the bottom end of the sliding cavity B is rotatably connected to a vertical shaft, the surface of the vertical shaft is uniformly provided with a plurality of threaded guide grooves along the axial direction, a sliding ring adapted to the shape of the surface of the vertical shaft is slidably provided in the sliding cavity B, the sliding ring is movably connected to the surface of the vertical shaft, the top end of the vertical shaft is provided with a sliding groove, a sliding rod is slidably connected to the sliding groove, the bottom end of the rod passes through the sliding cavity A and is fixedly connected to the top end of the sliding rod.

[0013] Preferably, the elastic component includes a spring, which is sleeved on the surface of the fixed column. Both ends of the spring are fixed with connecting rings, and the two connecting rings are movably connected to the bottom end of the sliding column and the base, respectively.

[0014] Preferably, the second arc-extinguishing mechanism includes an insulating tube, an upper connector B, a lower connector B, and a fuse. The insulating tube is disposed within the cavity. The upper connector B is threaded to the top end of the insulating tube and threaded to the bottom end of the base. The lower connector B is threaded to the bottom end of the insulating tube. The sealed cavity formed by the insulating tube, the upper connector B, and the lower connector B is filled with arc-extinguishing gas. The fuse is disposed within the insulating tube, and both ends of the fuse are detachably and fixedly connected to the upper connector B and the lower connector B, respectively.

[0015] The beneficial effects of this invention are: 1. This invention, through the design of the first and second arc-extinguishing mechanisms, ensures that when an impact current caused by lightning, accidental contact, or other unexpected events passes through the magnetic coil, the repulsive magnetic field increases. The magnetic ring drives the sliding column to descend, overcoming the elastic force of the elastic component. The connecting tube separates from the fixed contact, forming an electric arc. Simultaneously, the sliding cavity A and the output end of the gas replenishment component are misaligned, resulting in a smaller cavity volume formed by the sliding cavity A and the top of the fixed column, and a higher cavity air pressure. When the air channel connects with the sliding cavity A, the arc-extinguishing gas in the cavity rushes out from the air channel, rapidly dispersing the electric arc from bottom to top in a pulsed manner, achieving a rapid arc-extinguishing effect. After arc extinguishing, under the elastic force of the elastic component, the sliding column slides along the sliding groove to the initial position, allowing the top of the connecting tube to reconnect with the fixed contact, and the line automatically restores normal power supply. In the event of a continuous short-circuit fault, irreversible fuse isolation and arc extinguishing are performed, completely isolating the line, thereby achieving dual-level coordinated protection of the line and improving the functionality of the primary and secondary integrated circuit breaker.

[0016] 2. The present invention further designs the fixed column so that the top of the slip ring, the top of the slip cavity B, and the gap of the circular groove form an upper half cavity. The upper half cavity is connected with the slip cavity A to form an arc-extinguishing gas cavity. The bottom of the slip ring and the bottom of the slip cavity B form a lower half cavity. The downward movement of the slip column makes the volume of the arc-extinguishing gas cavity smaller and the gas pressure of the arc-extinguishing gas cavity higher until the gas pressure of the arc-extinguishing gas cavity is equal to the gas pressure of the lower half cavity. When the gas pressure of the arc-extinguishing gas cavity continues to increase, the slip ring descends along the slip cavity B so that the gas pressure of the arc-extinguishing gas cavity is equal to the gas pressure of the lower half cavity. The descent of the slip ring causes several threaded guide grooves to drive the vertical shaft to rotate, which in turn causes the rod to drive the insulating shaft to rotate until the bottom of several air channels is connected to the top of several air holes C respectively. The arc-extinguishing gas in the arc-extinguishing gas cavity rushes out rapidly in the form of pulses, quickly dispersing the arc from bottom to top, achieving the effect of rapid arc extinguishing. As the sliding column continues to slide downwards, when the arc-extinguishing gas in the arc-extinguishing chamber rushes out, the gas pressure in the arc-extinguishing chamber decreases, and the gas pressure in the lower half of the chamber is higher than that in the arc-extinguishing chamber. This causes the slip ring to rise into the sliding chamber B. On the one hand, this slows down the rate at which the volume of the arc-extinguishing chamber increases, thus causing the intensity of the arc-extinguishing gas flow to decrease slowly. On the other hand, the rise of the slip ring drives the insulating shaft to rotate in the opposite direction through the vertical shaft, causing the air channel and the air hole C to move relative to each other, thus reducing or cutting off the air path and reducing the loss of arc-extinguishing gas. This increases the rate at which the gas pressure in the arc-extinguishing chamber increases, which is then used for the next action. This forms an overall pulsed airflow with alternating strong and weak airflow, further enhancing the rapid arc-extinguishing effect.

[0017] 3. This invention designs several air channels in a spiral structure with the spiral radius gradually decreasing from bottom to top, and the top channels converge and connect, so that when the arc-extinguishing gas is ejected, it forms a high-speed rotating conical wind field that diffuses from bottom to top and from the inside to the outside. This wind field diffuses from the center of the arc root to the periphery, generating a radial tearing force on the arc from the inside to the outside, thus dispersing the arc. Compared with a direct airflow, this spiral converging structure can more thoroughly disintegrate and extinguish the arc from the center to the outside, further improving the arc extinguishing efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural cross-sectional schematic diagram of the present invention; Figure 3 This is a schematic cross-sectional view of the solid-sealed electrode of the present invention; Figure 4 This is a cross-sectional structural diagram of the electromagnetic module, the first arc-extinguishing mechanism, and the second arc-extinguishing mechanism of the present invention; Figure 5 This is a cross-sectional structural diagram of the electromagnetic module of the present invention; Figure 6 This is a partial structural cross-sectional schematic diagram of the first arc-extinguishing mechanism of the present invention; Figure 7 This is a schematic diagram of the sliding column and connecting pipe of the present invention; Figure 8 This is a schematic diagram of the structure of the insulating shaft of the present invention; Figure 9 This is a schematic diagram of the disassembled structure of the vertical shaft and slip ring of the present invention; Figure 10 This is a cross-sectional structural diagram of the second arc-extinguishing mechanism of the present invention.

[0019] Explanation of the labels in the diagram: 1. Opening and closing operating mechanism; 2. Solid-sealed pole; 3. Current transformer; 4. Electromagnetic module; 5. First arc extinguishing mechanism; 6. Second arc extinguishing mechanism; 21. Hole; 22. Middle septum cavity; 23. Upper septum cavity; 24. Side passage groove; 41. Sheath; 42. Upper connector A; 43. Magnetic coil; 44. Lower connector A; 51. Fixed contact; 52. Gas supply assembly; 53. Sliding column; 54. Magnetic ring; 55. Connecting pipe; 56. Insulating shaft; 57. Fixed column; 58. Elastic component; 511. Interface; 521. Column; 522. Sliding groove; 523. Gas storage ring cavity; 524. Air hole A; 525. Air pipe; 526. Air connector; 531. Slide cavity A; 532. Air hole B; 533. Mounting groove; 534. Air hole C; 561. Rod body; 562. Air passage; 571. Base; 572. Circular groove; 573. Sliding cavity B; 574. Vertical shaft; 575. Partial threaded guide groove; 576. Slip ring; 577. Sliding groove; 578. Sliding rod; 581. Spring; 582. Connecting ring; 61. Insulating tube; 62. Upper connector B; 63. Lower connector B; 64. Fuse. Detailed Implementation

[0020] like Figures 1 to 10 As shown, the present invention relates to a dual-cavity isolated primary and secondary fusion circuit breaker, comprising a tripping and closing operating mechanism 1, wherein a plurality of solid-sealed poles 2 are uniformly installed on the top of the tripping and closing operating mechanism 1, and a current transformer 3 is installed on one side of the solid-sealed poles 2. The tripping and closing operating mechanism 1, the solid-sealed poles 2 and the current transformer 3 of the present invention are all prior art, and will not be described in detail here.

[0021] In embodiments of the present invention, such as Figure 3 As shown, a cavity 21 is provided at the bottom of the solid-sealed pole 2, a middle partition cavity 22 is provided at the top of the cavity 21, an upper partition cavity 23 is provided at the top of the middle partition cavity 22, and a side through groove 24 is provided on one side of the top of the middle partition cavity 22 relative to the position of the current transformer 3.

[0022] In embodiments of the present invention, such as Figure 2 As shown, an electromagnetic module 4 is provided on the top of the solid-sealed pole 2, such as... Figure 5 As shown, the electromagnetic module 4 includes a protective shell 41, an upper connector A42, and a lower connector A44. The protective shell 41 is fixed inside the upper cavity 23. The upper connector A42 is fixed to the top of the sealed pole 2, and the bottom end of the upper connector A42 extends into the protective shell 41 and is fixedly fitted with a magnetic induction coil 43. The lower connector A44 is fixed to the bottom end of the protective shell 41, and the top end of the lower connector A44 is fixedly connected to the bottom end of the magnetic induction coil 43. Through the structural design of the electromagnetic module 4, this invention generates a repulsive magnetic field when current passes through the magnetic induction coil 43.

[0023] In embodiments of the present invention, such as Figure 2 and Figure 6 As shown, the solid-sealed pole 2 is provided with a first arc-extinguishing mechanism 5 in the middle, such as... Figure 4 As shown, the first arc-extinguishing mechanism 5 includes a fixed contact 51, a gas supply component 52, a sliding column 53, a magnetic ring 54, a connecting pipe 55, an insulating shaft 56, and a fixed column 57.

[0024] In embodiments of the present invention, such as Figure 4 and Figure 5 As shown, the fixed contact 51 is located at the top of the partition cavity 22, the bottom end of the lower connector A44 passes through the partition cavity 22 and is fixedly connected to the top end of the fixed contact 51, the input end of the current transformer 3 extends through the side through groove 24 into the partition cavity 22 and is fixedly connected to the fixed contact 51, and the bottom end of the fixed contact 51 is provided with an interface 511.

[0025] In embodiments of the present invention, such as Figure 6As shown, the gas replenishment assembly 52 includes a column 521, which is located below the fixed contact 51 and fixedly connected to the central diaphragm 22. A sliding groove 522 is formed at the center of the column 521, and a gas storage ring cavity 523 is formed inside the column 521. A plurality of air holes A524 communicating with the gas storage ring cavity 523 are evenly formed on the surface of the sliding groove 522. A gas pipe 525 communicating with the gas storage ring cavity 523 is fixedly mounted on the column 521. The gas pipe 525 extends out of the solidified electrode post 2 and is fixedly equipped with a gas connector 526. Through the configuration of the gas replenishment assembly 52, the gas storage ring cavity 523 is used to store arc-extinguishing gas. When the arc-extinguishing gas in the gas storage ring cavity 523 is insufficient, it can be replenished through the gas connector 526.

[0026] In embodiments of the present invention, such as Figure 6 and Figure 7 As shown, the sliding column 53 is slidably disposed on the sliding groove 522. A sliding cavity A531 is formed at the bottom end of the sliding column 53. A plurality of air holes B532, communicating with the sliding cavity A531, are evenly distributed on the bottom surface of the sliding column 53. The air holes B532 are respectively connected and engaged with a plurality of air holes A524. An installation groove 533 is formed at the top end of the sliding column 53, and a plurality of air holes C534 are formed at the center of the installation groove 533. With the above configuration, in the initial state, the air holes B532 are connected to the air holes A524.

[0027] In embodiments of the present invention, such as Figure 6 and Figure 7 As shown, the magnetic ring 54 is fixed on the mounting groove 533, the connecting pipe 55 is fixed at the center of the mounting groove 533, the top end of the connecting pipe 55 is inserted into the interface 511, the insulating shaft 56 is rotatably disposed inside the connecting pipe 55, and the bottom end of the insulating shaft 56 is fixed with a rod 561 rotatably connected to the mounting groove 533. Several air channels 562 are evenly distributed along the circumference of the insulating shaft 56, and the bottom ends of the air channels 562 are respectively connected to the top ends of several air holes C534. In the initial state, the air channels 562 and the air holes C534 are staggered.

[0028] In embodiments of the present invention, such as Figure 6 As shown, the fixed column 57 is fixed at the bottom of the diaphragm cavity 22 and slidably connected to the sliding cavity A531. The bottom end of the fixed column 57 and the bottom end of the sliding column 53 are elastically connected through the elastic component 58.

[0029] In embodiments of the present invention, such as Figure 6 and Figure 9As shown, a base 571 is fixedly provided at the bottom end of the fixed column 57, and the base 571 is fixedly connected to the bottom end of the diaphragm cavity 22. A circular groove 572 is provided at the top end of the fixed column 57, and a sliding cavity B573 is provided at the bottom end of the circular groove 572. A vertical shaft 574 is rotatably connected to the bottom end of the sliding cavity B573. Several threaded guide grooves 575 are uniformly fixed along the axial direction on the surface of the vertical shaft 574. A sliding ring 576 that matches the shape of the surface of the vertical shaft 574 is slidably provided in the sliding cavity B573. The sliding ring 576 is movably connected to the surface of the vertical shaft 574. A sliding groove 577 is provided at the top end of the vertical shaft 574, and a sliding rod 578 is slidably connected to the sliding groove 577. The bottom end of the rod 561 passes through the sliding cavity A531 and is fixedly connected to the top end of the sliding rod 578.

[0030] In embodiments of the present invention, such as Figure 6As shown, the elastic component 58 includes a spring 581, which is sleeved on the surface of the fixed post 57. Connecting rings 582 are fixed at both ends of the spring 581, and the two connecting rings 582 are movably connected to the bottom end of the sliding post 53 and the base 571, respectively. Through the above arrangement, the top of the sliding ring 576, the top of the sliding cavity B573, and the gap in the circular groove 572 form an upper cavity, which communicates with the sliding cavity A531 to form an arc-extinguishing gas chamber. The bottom end of the sliding ring 576 and the bottom of the sliding cavity B573 form a lower cavity, which is filled with gas. Initially, the gas pressure in the lower cavity is greater than the pressure in the arc-extinguishing gas chamber, causing the top end of the sliding ring 576 to contact the bottom end of the circular groove 572. When an impact current caused by lightning, accidental contact, or other unexpected events passes through the magnetic coil 43, the repulsive magnetic field increases, and the magnetic ring 54 drives the sliding post 53 to overcome the elastic force of the elastic component 58 and slide down along the sliding groove 522, causing... The top of the connecting pipe 55 disengages from the interface 511, forming an electric arc. Several air holes B532 disengage from several air holes A524. Simultaneously, the sliding column 53 slides down, causing the arc-extinguishing gas chamber volume to decrease and the arc-extinguishing gas chamber pressure to increase until the arc-extinguishing gas chamber pressure equals the lower half-chamber pressure. As the arc-extinguishing gas chamber pressure continues to increase, the slip ring 576 descends along the slip cavity B573, causing the arc-extinguishing gas chamber pressure to equalize with the lower half-chamber pressure. The descent of the slip ring 576 causes several threaded guide grooves 575 to rotate the vertical shaft 574, which in turn causes the rod 561 to rotate the insulating shaft 56 until the bottom ends of several air channels 562 disengage from several air holes C524. The top of the 34 is connected, and the arc-extinguishing gas in the arc-extinguishing chamber rushes out rapidly, pulsating the arc from bottom to top to achieve rapid arc extinguishing. It is worth mentioning that when the sliding column 53 continues to slide down, the gas pressure in the arc-extinguishing chamber decreases as the arc-extinguishing gas rushes out, with the lower half of the chamber having a higher pressure than the arc-extinguishing chamber itself. This causes the slip ring 576 to rise, which slows down the rate at which the volume of the arc-extinguishing chamber increases, thus gradually reducing the intensity of the arc-extinguishing gas flow. Furthermore, the rise of the slip ring 576 drives the insulating shaft 56 to rotate in the opposite direction via the vertical shaft 574, causing the gas channel 562 and the gas hole C534 to move relative to each other, thus increasing the gas flow intensity. The path is narrowed or cut off, reducing the loss of arc-extinguishing gas, thereby increasing the speed of gas pressure increase in the arc-extinguishing gas chamber for the next action, thus forming an overall pulsed airflow with alternating strong and weak airflow, further improving the rapid arc extinguishing effect. After arc extinguishing, under the elastic force of the elastic component 58, the sliding column 53 slides along the sliding groove 522 to the initial position, so that the top of the connecting pipe 55 is reconnected to the interface 511. At this time, the gas pressure in the lower half chamber is greater than the gas pressure in the arc-extinguishing gas chamber, so that the slip ring 576 slides to the initial position, and several air holes B532 are connected to several air holes A524 respectively, and the arc-extinguishing gas in the gas storage ring cavity 523 enters the arc-extinguishing gas chamber.

[0031] In embodiments of the present invention, such as Figure 8As shown, the air channel 562 has a spiral structure, and the spiral radius of the air channel 562 gradually decreases from bottom to top, so that the tops of several air channels 562 converge and connect. This invention, by designing several air channels 562 with a spiral structure in which the spiral radius gradually decreases from bottom to top and the tops converge and connect, creates a high-speed rotating conical wind field that diffuses from bottom to top and from the inside out when the arc-extinguishing gas is ejected. This wind field diffuses from the center of the arc root outwards, generating a radial tearing force on the arc from the inside out, thus dispersing the arc. Compared to a direct airflow, this spiral converging structure can more thoroughly disintegrate and extinguish the arc from the center outwards, further improving the arc-extinguishing efficiency.

[0032] In embodiments of the present invention, such as Figure 10 As shown, the bottom of the solid-sealed pole 2 is provided with a second arc-extinguishing mechanism 6. The second arc-extinguishing mechanism 6 includes an insulating tube 61, an upper connector B62, a lower connector B63, and a fuse 64. The insulating tube 61 is located inside the cavity 21. The upper connector B62 is threaded to the top end of the insulating tube 61 and threaded to the bottom end of the base 571. The lower connector B63 is threaded to the bottom end of the insulating tube 61. The sealed cavity formed by the insulating tube 61, the upper connector B62, and the lower connector B63 is filled with arc-extinguishing gas. The fuse 64 is located inside the insulating tube 61. Both ends of the fuse 64 are detachably and fixedly connected to the upper connector B62 and the lower connector B63, respectively. This invention, through the structural design of the second arc-extinguishing mechanism 6, allows for efficient arc extinguishing when a short-circuit fault occurs. The short-circuit current is conducted via the lower connector B63, fuse 64, and upper connector B62. For transient surge currents caused by lightning strikes or momentary contact with a conductor, the first arc-extinguishing mechanism 5 quickly extinguishes the arc, rapidly cutting off the surge current. Because the energizing time of fuse 64 is extremely short, the heat accumulated on the molten metal is far below its melting threshold, remaining intact, and the line automatically resumes normal power supply. When a persistent short-circuit fault occurs, although the first arc-extinguishing mechanism 5 can complete the initial pulse arc extinguishing, the fault point persists, the arc is re-broken, and the short-circuit current is re-established. During this process, the continuous short-circuit current repeatedly flows through fuse 64, and the heat of the molten metal continuously accumulates until it reaches the material's melting temperature, causing fuse 64 to melt. The arc generated at the moment of melting is rapidly cooled and extinguished by the arc-extinguishing gas within the insulating tube 61, permanently disconnecting the circuit and achieving final safety isolation. The first arc-extinguishing mechanism 5 and the second arc-extinguishing mechanism 6 form a two-level collaborative protection in the time and energy dimension: the first arc-extinguishing mechanism 5 is responsible for handling high-frequency transient faults, protecting the fuse 64 from being accidentally blown, achieving imperceptible self-healing, and reducing the frequency of manual maintenance; the second arc-extinguishing mechanism 6 is responsible for handling low-frequency permanent faults, performing irreversible physical disconnection when the fault cannot be eliminated, ensuring system safety, and after maintenance, the fuse 64 is replaced manually.

[0033] Working principle: This embodiment provides a dual-cavity isolated primary and secondary fusion circuit breaker. In use, the current is introduced through the upper connector A42, and forms a complete current path through the magnetic coil 43, the lower connector A44, the fixed contact 51, the connecting tube 55, the sliding column 53, the fixed column 57, the base 571, the upper connector B62, the fuse 64 and the lower connector B63. In the initial state, the air hole B532 at the bottom of the sliding column 53 is connected to the air hole A524 on the column body 521. The arc-extinguishing gas in the gas storage ring cavity 523 enters the sliding cavity A531 through the air hole A524 and the air hole B532 to replenish the arc-extinguishing gas cavity. At the same time, the air passage 562 on the insulating shaft 56 and the air hole C534 on the mounting groove 533 are misaligned, and the air passage is closed. When the line generates a transient surge current due to an accident such as lightning strike, induced overvoltage, tree branch momentarily touching the line, or accidental contact, the surge current flows through the magnetic coil 43 in the electromagnetic module 4; the magnetic coil 43 generates a momentarily increased repulsive magnetic field, which acts on the magnetic ring 54 in the first arc extinguishing mechanism 5. The magnetic ring 54 is subjected to a downward repulsive force, which drives the slide column 53 to overcome the elastic force of the spring 581 in the elastic component 58 and slide down along the sliding groove 522 of the air supply component 52. During the sliding process of the slide column 53, the top of the connecting pipe 55 disengages from the interface 511 at the bottom of the fixed contact 51, and an electric arc is generated in the contact gap. As the sliding column 53 slides down, the air hole B532 at the bottom of the sliding column 53 is misaligned with the air hole A524 on the column body 521, and the air supply passage of the gas storage ring cavity 523 is cut off. The volume of the arc extinguishing gas cavity shrinks and the gas pressure rises sharply. When the gas pressure of the arc extinguishing gas cavity is higher than the gas pressure of the lower half cavity, the sliding ring 576 descends along the sliding cavity B573 and drives the vertical shaft 574 to rotate through part of the threaded guide groove 575. The vertical shaft 574 drives the insulating shaft 56 to rotate through the sliding rod 578 and the rod body 561, so that the bottom end of the air passage 562 on the insulating shaft 56 is connected to the top end of the air hole C534 on the mounting groove 533. The high-pressure arc-extinguishing gas in the arc-extinguishing chamber enters the spiral-shaped air channel 562 through the air hole C534 and then rushes out, forming a rotating conical wind field that diffuses from bottom to top and from inside to outside. This wind field diffuses from the center of the arc root to the periphery, generating a radial tearing force on the arc from the inside to the outside. It rapidly disperses and extinguishes the arc in a pulse form. When the arc-extinguishing gas in the arc-extinguishing chamber rushes out, the air pressure in the arc-extinguishing chamber decreases. The air pressure in the lower half of the chamber is higher than that in the arc-extinguishing chamber, causing the slip ring 576 to rise. On the one hand, this slows down the rate at which the volume of the arc-extinguishing chamber increases, thus causing the intensity of the arc-extinguishing airflow to decrease slowly. On the other hand, the rise of the slip ring 576 drives the insulating shaft 56 to rotate in the opposite direction through the vertical shaft 574, causing the air channel 562 and the air hole C534 to move relative to each other, thus narrowing or cutting off the air path, reducing the loss of arc-extinguishing gas, thereby increasing the rate at which the air pressure in the arc-extinguishing chamber increases, for use in the next action. This forms an overall pulsed airflow with alternating strong and weak airflow, further enhancing the rapid arc-extinguishing effect. After the arc is extinguished, the spring 581 in the elastic component 58 pushes the slide column 53 to slide upward along the sliding groove 522 to reset, and the top of the connecting pipe 55 is reinserted into the interface 511 of the fixed contact 51, and the line automatically restores normal power supply; at the same time, the air hole B532 and the air hole A524 are reconnected, and the arc extinguishing gas in the gas storage ring cavity 523 is replenished to the arc extinguishing gas cavity through the air hole A524 and the air hole B532, waiting for the next action; When a persistent short-circuit fault occurs in the line, the first arc extinguishing mechanism 5 first performs the above-mentioned pulse arc extinguishing action; after the arc is extinguished, because the fault point continues to exist, the arc is broken down again, and the short-circuit current is established again; at this time, the first arc extinguishing mechanism 5 will act again to extinguish the arc, and so on. During this process, the continuous short-circuit current repeatedly flows through the fuse 64 in the second arc-extinguishing mechanism 6. The fuse 64 is connected in series between the upper connector B62 and the lower connector B63. Each time the short-circuit current flows through the fuse 64, the heat of its molten body continuously accumulates until it reaches the melting temperature of the material. The electric arc generated at the moment the fuse 64 melts is rapidly cooled and extinguished in the arc-extinguishing gas filled in the insulating tube 61, and the circuit is physically and permanently disconnected. During maintenance, remove the insulating tube 61 from the cavity 21, unscrew the upper connector B62 and the lower connector B63, replace the new fuse 64, and reinstall to restore power supply.

[0034] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A dual-cavity isolated primary and secondary integrated circuit breaker, comprising a tripping and closing operating mechanism (1), wherein a plurality of solid-sealed poles (2) are uniformly installed on the top of the tripping and closing operating mechanism (1), and a current transformer (3) is installed on one side of each solid-sealed pole (2), characterized in that, The solid-sealed pole (2) is provided with an electromagnetic module (4), a first arc extinguishing mechanism (5) and a second arc extinguishing mechanism (6) connected in series from top to bottom. The electromagnetic module (4) is used to generate a repulsive magnetic field when current passes through it; The first arc-extinguishing mechanism (5) is used to perform a reversible arc-extinguishing action triggered by the repulsive magnetic field caused by the instantaneous impact current; The first arc-extinguishing mechanism (5) includes a fixed contact (51) and a gas supply component (52). The fixed contact (51) is fixedly connected to the output end of the electromagnetic module (4). A sliding column (53) is slidably provided inside the gas supply component (52). A sliding cavity A (531) is opened at the bottom end of the sliding column (53). The sliding cavity A (531) is connected and cooperates with the output end of the gas supply component (52). A connecting pipe (55) and a magnetic ring (54) are fixedly provided at the top end of the sliding column (53) in an inner and outer structure. The top end of the connecting tube (55) is inserted into the bottom end of the fixed contact (51). An insulating shaft (56) is rotatably provided inside the connecting tube (55). The insulating shaft (56) is provided with a plurality of air channels (562) that communicate and cooperate with the sliding cavity A (531). The bottom end of the sliding cavity A (531) is slidably connected to a fixed post (57) that is fixedly connected to the solid sealing pole (2). The bottom end of the fixed post (57) and the bottom end of the sliding post (53) are elastically connected through an elastic component (58). The second arc-extinguishing mechanism (6) is used to be triggered under the action of continuous short-circuit current to perform irreversible fuse isolation and extinguish the arc.

2. The dual-cavity isolated primary and secondary fusion circuit breaker according to claim 1, characterized in that, The bottom end of the solid-sealed pole (2) is provided with a cavity (21), the top end of the cavity (21) is provided with a middle partition cavity (22), the top end of the middle partition cavity (22) is provided with an upper partition cavity (23), and a side through groove (24) is provided on one side of the top of the middle partition cavity (22) relative to the position of the current transformer (3).

3. The dual-cavity isolated primary and secondary fusion circuit breaker according to claim 2, characterized in that, The electromagnetic module (4) includes a protective shell (41), an upper connector A (42) and a lower connector A (44). The protective shell (41) is fixed in the upper cavity (23). The upper connector A (42) is fixed at the top of the sealed pole (2). The bottom end of the upper connector A (42) passes through the protective shell (41) and is fixed with a magnetic induction coil (43). The lower connector A (44) is fixed at the bottom of the protective shell (41). The top end of the lower connector A (44) is fixedly connected to the bottom end of the magnetic induction coil (43).

4. The dual-cavity isolated primary and secondary fusion circuit breaker according to claim 3, characterized in that, The fixed contact (51) is located at the top of the partition cavity (22). The bottom end of the lower connector A (44) passes through the partition cavity (22) and is fixedly connected to the top end of the fixed contact (51). The input end of the current transformer (3) extends through the side through groove (24) into the partition cavity (22) and is fixedly connected to the fixed contact (51). The bottom end of the fixed contact (51) is provided with an interface (511). The top end of the connecting tube (55) is inserted into the interface (511).

5. The dual-cavity isolated primary and secondary integrated circuit breaker according to claim 2, characterized in that, The gas replenishment component (52) includes a column (521), which is located below the fixed contact (51) and fixedly connected to the central septum (22). A sliding groove (522) is provided at the center of the column (521), and a gas storage ring cavity (523) is provided inside the column (521). A plurality of air holes A (524) communicating with the gas storage ring cavity (523) are evenly provided on the surface of the sliding groove (522). An air pipe (525) communicating with the gas storage ring cavity (523) is fixed on the column (521), and the air pipe (525) passes through the solid sealing pole (2) and is fixedly provided with an air connector (526).

6. The dual-cavity isolated primary and secondary integrated circuit breaker according to claim 5, characterized in that, The sliding column (53) is slidably disposed on the sliding groove (522). The bottom surface of the sliding column (53) is evenly provided with a plurality of air holes B (532) communicating with the sliding cavity A (531). The plurality of air holes B (532) are respectively connected and cooperate with the plurality of air holes A (524). The top of the sliding column (53) is provided with an installation groove (533). The magnetic ring (54) is fixed on the installation groove (533). The connecting pipe (55) is fixed at the center of the installation groove (533). The center of the installation groove (533) is provided with a plurality of air holes C (534). The bottom ends of the plurality of air channels (562) are respectively connected and cooperated with the top ends of the plurality of air holes C (534).

7. The dual-cavity isolated primary and secondary integrated circuit breaker according to claim 6, characterized in that, The bottom end of the insulating shaft (56) is fixed with a rod (561) that is rotatably connected to the mounting groove (533). A plurality of air channels (562) are evenly arranged in the circumferential direction. The air channels (562) have a spiral structure. The spiral radius of the air channels (562) gradually decreases from bottom to top so that the tops of the plurality of air channels (562) converge and connect.

8. The dual-cavity isolated primary and secondary fusion circuit breaker according to claim 7, characterized in that, The bottom end of the fixed column (57) is fixedly provided with a base (571), the base (571) is fixedly connected to the bottom end of the diaphragm cavity (22), the top end of the fixed column (57) is provided with a circular groove (572), the bottom end of the circular groove (572) is provided with a sliding cavity B (573), the bottom end of the sliding cavity B (573) is rotatably connected with a vertical shaft (574), the surface of the vertical shaft (574) is uniformly provided with several threaded guide grooves (575) along the axial direction, a sliding ring (576) adapted to the surface shape of the vertical shaft (574) is slidably provided in the sliding cavity B (573), the sliding ring (576) is movably connected to the surface of the vertical shaft (574), the top end of the vertical shaft (574) is provided with a sliding groove (577), a sliding rod (578) is slidably connected on the sliding groove (577), the bottom end of the rod (561) passes through the sliding cavity A (531) and is fixedly connected to the top end of the sliding rod (578).

9. The dual-cavity isolated primary and secondary fusion circuit breaker according to claim 8, characterized in that, The elastic component (58) includes a spring (581), which is sleeved on the surface of the fixed column (57). Both ends of the spring (581) are fixed with connecting rings (582), and the two connecting rings (582) are movably connected to the bottom end of the sliding column (53) and the base (571), respectively.

10. The dual-cavity isolated primary and secondary fusion circuit breaker according to claim 8, characterized in that, The second arc-extinguishing mechanism (6) includes an insulating tube (61), an upper connector B (62), a lower connector B (63), and a fuse (64). The insulating tube (61) is located inside the cavity (21). The upper connector B (62) is threaded to the top of the insulating tube (61). The upper connector B (62) is threaded to the bottom of the base (571). The lower connector B (63) is threaded to the bottom of the insulating tube (61). The sealed cavity formed by the insulating tube (61), the upper connector B (62), and the lower connector B (63) is filled with arc-extinguishing gas. The fuse (64) is located inside the insulating tube (61). The two ends of the fuse (64) are detachably and fixedly connected to the upper connector B (62) and the lower connector B (63), respectively.

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