Primary and secondary fused package circuit breaker

Abstract

The application discloses a primary and secondary fusion complete set of pole-mounted circuit breaker and relates to the technical field of circuit breakers, which comprises an arc-extinguishing chamber, the arc-extinguishing chamber comprises an insulating shell, a movable contact, a fixed contact, a dynamic gas generating unit and a passive magnetic sensing unit. The dynamic gas generating unit comprises a gas generating element, a fixed magnetic element and a flow guiding element. The core of the application is that the passive magnetic sensing unit is configured to drive the dynamic gas generating unit and the flow guiding element to move when the movable contact is opened, and the fluorocarbon gas generated by the decomposition of the gas generating element under the electric arc is guided to the electric arc area in the center of the arc-extinguishing chamber, so that the uniform distribution is formed to realize efficient arc extinguishing. Through the synergistic effect of magnetic control driving, passive gas generation and active flow guiding, the arc extinguishing speed and reliability are significantly improved, and the technical problems that the arc extinguishing effect of the existing pole-mounted circuit breaker is poor and the high integration and high reliability requirements of the primary and secondary fusion equipment cannot be met are effectively solved.

Description

Technical Field

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

[0002] As a key protection and control device in power distribution networks, pole-mounted circuit breakers have the core function of quickly and reliably interrupting fault currents to ensure power grid safety. With the in-depth development of primary and secondary integration technology, higher requirements are placed on the breaking performance, miniaturization, environmental adaptability, and maintenance-free characteristics of the circuit breaker body.

[0003] During the process of a circuit breaker interrupting a fault current, at the instant the moving and stationary contacts separate, the medium between the contacts is ionized due to the strong electric field and high temperature, generating a high-temperature, high-energy electric arc. The presence of this electric arc is extremely dangerous: First, the continuously burning arc will severely erode the contact material, reducing the electrical and mechanical lifespan of the circuit breaker; second, the high temperature generated by the arc may cause aging, carbonization, or even breakdown of insulating components, leading to equipment damage; finally, if the arc cannot be reliably extinguished within a short time, it may cause the circuit breaker to fail to interrupt the fault, leading to the expansion of the line fault, or even serious accidents such as the circuit breaker exploding.

[0004] Furthermore, with the rapid development of power distribution networks towards intelligence and automation, the integration of primary and secondary circuit breakers has become an inevitable trend for pole-mounted circuit breakers. This highly integrates traditional primary switching equipment with secondary intelligent equipment. However, this integration places higher demands on the breaking performance of the circuit breaker itself. The intelligent unit requires the circuit breaker to perform opening and closing operations more quickly and accurately, which necessitates a faster and more deterministic arc extinguishing process. Since the primary and secondary equipment are tightly installed in a miniaturized, enclosed enclosure, if the arc cannot be effectively controlled, it will severely damage surrounding intelligent electronic equipment, current and voltage sensors, and other precision components. Therefore, we propose a complete pole-mounted circuit breaker integrating primary and secondary circuit breaker components. Summary of the Invention

[0005] The purpose of this invention is to provide a primary and secondary integrated pole-mounted circuit breaker to solve the technical problem that the arc extinguishing of existing pole-mounted circuit breakers cannot meet current requirements.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a primary and secondary integrated pole-mounted circuit breaker, comprising a mechanism box; an arc-extinguishing chamber disposed on the mechanism box; a current transformer disposed on the back of the mechanism box, with its top end connected to the arc-extinguishing chamber; and a voltage transformer disposed on the side of the mechanism box; the arc-extinguishing chamber comprising an insulating shell, a moving contact, a fixed contact, a dynamic gas-generating unit, and a passive magnetic sensing unit; the moving contact and the fixed contact are disposed inside the insulating shell; the dynamic gas-generating unit is disposed on the inner wall of the insulating shell; and the passive magnetic sensing unit is disposed on the moving contact;

[0007] The dynamic gas generation unit includes a gas generation element, a fixed magnetic element, and a flow guiding element. The gas generation element is movably disposed on the inner wall of the insulating shell, the fixed magnetic element is disposed inside the gas generation element, and the flow guiding element is fixedly connected to the bottom end of the gas generation element.

[0008] The passive magnetic sensing unit is configured such that when the moving contact opens and carries the passive magnetic sensing unit to move relative to the fixed magnetic element, the magnetic force of the passive magnetic sensing unit drives the dynamic gas generating unit and the flow guiding element at its bottom to move, guiding the fluorocarbon gas generated by the arc decomposition of the gas generating element to the arc region in the center of the arc extinguishing chamber, so as to form a uniform distribution and efficiently extinguish the arc.

[0009] Preferably, the arc-extinguishing chamber further includes a bellows for sealing and providing space for the movement of the moving contact, and a moving end cover plate and a fixed end cover plate for mounting the moving and fixed contacts; the bellows is disposed at the bottom of the interior of the insulating shell, the moving end cover plate is disposed at the top of the bellows, and the moving contact is disposed at the top of the moving end cover plate; the fixed end cover plate is disposed at the top of the interior of the insulating shell, and the fixed contact is disposed at the bottom of the fixed end cover plate.

[0010] Preferably, the arc-extinguishing chamber further includes an insulating sleeve fitted onto the insulating outer shell, the dynamic gas-generating unit is movably embedded in the inner wall of the insulating outer shell, and the passive magnetic sensing unit is fitted onto the moving contact.

[0011] Preferably, the gas generating element includes an active part and a follower part, the active part being movably disposed on the inner wall of the insulating shell, and the follower part being fixedly disposed at the bottom end of the active part;

[0012] The outer wall of the active part is provided with annular grooves at equal intervals. A pulley is rotatably provided in the grooves. The end of the pulley away from the grooves is in contact with the inner wall of the insulating shell. The flow guiding element is provided on the follower part.

[0013] Preferably, the fixed magnetic element includes a force-receiving groove, the force-receiving groove having an inclined surface A and an inclined surface B, the area of ​​the inclined surface A being larger than the area of ​​the inclined surface B, and a permanent magnet being embedded in the inclined surface A.

[0014] Preferably, the insulating shell is provided with an arc-extinguishing cavity, the inner wall of the top of the arc-extinguishing cavity is provided with a movable groove, the gas generating element is movably embedded in the movable groove, the movable groove is provided with a sliding groove, and the pulley is slidably disposed on the sliding groove;

[0015] The inner wall of the arc-extinguishing chamber is provided with a guide groove, and the guide groove is provided with a bend groove at equal intervals in a ring. The guide groove is connected to a plurality of the bend grooves, and the end of the flow guiding element away from the gas generating element is movably inserted into the guide groove.

[0016] Preferably, the flow guiding element includes a rotating rod, an arc-fixed plate, a guide post, and a flow guiding blade. The rotating rod is rotatably inserted into the bottom end of the gas generating element in a ring with equal intervals. The arc-fixed plate is fixedly sleeved on one end of the rotating rod. The flow guiding blade is fixedly connected to the other end of the rotating rod. The guide post is symmetrically fixed on the arc-fixed plate, and the end of the guide post away from the arc-fixed plate is movably inserted into the guide groove.

[0017] The guide vane is also provided with several flow-expanding holes, which are teardrop-shaped.

[0018] Preferably, the passive magnetic sensing unit includes a blocking disk, a spring assembly, and a magnetic sensing element. The blocking disk is fixedly sleeved on the moving contact, the spring assembly is fixedly disposed on the top of the blocking disk, the magnetic sensing element is fixedly disposed on the top of the spring assembly, and the magnetic sensing element is movably sleeved on the moving contact.

[0019] Preferably, the magnetic sensing element includes a force-applying groove, the force-applying groove having an inclined surface A and an inclined surface B, the area of ​​the inclined surface A being larger than that of the inclined surface B, and a conversion element being provided on the inclined surface A.

[0020] Preferably, the conversion element includes a cast iron block, a magnetic column, a dividing wheel, and a dividing rack. The cast iron block is fixedly embedded in the inclined surface A. The magnetic column is rotatably mounted on the cast iron block. The dividing wheel is fixedly connected to one end of the magnetic column. The dividing rack is movably inserted into the force-applying tooth groove. One end of the dividing rack is fixedly connected to the blocking disc, and the other end of the dividing rack is engaged with the dividing wheel.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention achieves efficient arc-extinguishing gas supply by designing a dynamic gas-generating unit. When the circuit breaker arc is generated, its high temperature can instantly decompose the gas-generating element to produce a large amount of arc-extinguishing gas rich in fluorine. This gas has extremely high electronegativity and heat capacity, which can strongly adsorb free electrons and cool the arc plasma, fundamentally improving the recovery strength of the medium and solving the technical problems of insufficient arc-extinguishing capacity and easy reignition of traditional circuit breakers.

[0023] 2. This invention also achieves active and optimized control of fluorocarbon gases by designing a flow guiding element. The flow guiding blades rotate periodically under the constraint of the guide groove and the bending groove, actively and precisely agitating and guiding the originally disordered diffused fluorocarbon gas to the arc axis. At the same time, the teardrop-shaped flow expansion hole can generate uniform microturbulence, which greatly increases the contact area and mixing efficiency between fluorocarbon gases and the arc. This solves the problems of uneven airflow distribution and low space utilization of the arc extinguishing chamber in the prior art, ensuring that the gas generated at any position can be effectively utilized.

[0024] 3. This invention also achieves non-contact power drive by designing a magnetic pole switching and inclined plane coupling mechanism between the fixed magnetic element and the passive magnetic induction unit. This mechanism converts the linear motion of the moving contact into magnetic pole switching and rotational drive, and efficiently converts the magnetic repulsion force into tangential driving force through the inclined plane, reliably driving the rotation of the dynamic gas generation unit without the need for additional energy input. This solves the problems of slow response, insufficient driving force, or the need for complex external power sources in traditional mechanisms, ensuring the speed, synchronization, and reliability of the arc extinguishing action. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the circuit breaker of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the arc-extinguishing chamber of the present invention.

[0027] Figure 3 This is a side cross-sectional view of the arc-extinguishing chamber of the present invention.

[0028] Figure 4 This is a schematic diagram of the side cross-sectional structure of the insulating shell of the present invention;

[0029] Figure 5 This is a schematic diagram of the active part and the fixed magnetic element of the gas generating element of the present invention;

[0030] Figure 6 This is a schematic diagram of the fixed magnetic element and passive magnetic induction unit structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the disassembled structure of the moving contact and passive magnetic sensing unit of the present invention;

[0032] Figure 8 This is a schematic diagram of the internal structure of the magnetic sensing element of the present invention in cross-section;

[0033] Figure 9 This is a schematic diagram of the gas-generating element structure of the present invention;

[0034] Figure 10 This is a cross-sectional view of the gas generating element and a schematic diagram of part of the flow guiding element structure of the present invention;

[0035] Figure 11 This is a top view of the flow guiding element of the present invention;

[0036] Figure 12 This is a schematic diagram of the guide vane and flow diffuser structure of the present invention;

[0037] Figure 13 This is a schematic diagram of the dynamic gas generation unit in use according to the present invention.

[0038] Explanation of the labels in the diagram:

[0039] 1. Mechanism box; 2. Arc-extinguishing chamber; 3. Current transformer; 4. Voltage transformer;

[0040] 21. Insulating shell; 22. Insulating sleeve; 23. Bellows; 24. Moving end cover plate; 25. Fixed end cover plate; 26. Moving contact; 27. Fixed contact; 28. Dynamic gas generation unit; 29. ​​Passive magnetic induction unit;

[0041] 211. Arc extinguishing cavity; 212. Movable groove; 213. Slide groove; 214. Guide groove; 215. Bending groove;

[0042] 281. Gas generating element; 282. Magnetic element; 283. Flow guiding element;

[0043] 2811. Driving part; 2812. Follower part; 2813. Gear groove; 2814. Pulley;

[0044] 2821. Force-bearing tooth groove; 2822. Inclined plane A; 2823. Inclined plane B; 2824. Permanent magnet;

[0045] 2831. Rotating rod; 2832. Arc-fixed plate; 2833. Guide post; 2834. Guide vane; 2835. Flow diffuser hole;

[0046] 291. Blocking disc; 292. Spring assembly; 293. Magnetic sensing element;

[0047] 2931. Force-applying tooth groove; 2932. Inclined surface A; 2933. Inclined surface B; 2934. Conversion element; 2935. Cast iron block; 2936. Magnetic column; 2937. Dividing gear; 2938. Dividing rack. Detailed Implementation

[0048] like Figures 1 to 13 As shown, the primary and secondary integrated pole-mounted circuit breaker of the present invention includes a mechanism box 1; an arc-extinguishing chamber 2 disposed on the mechanism box 1; a current transformer 3 disposed on the back of the mechanism box 1, and its top end connected to the arc-extinguishing chamber 2; and a voltage transformer 4 disposed on the side of the mechanism box 1. The arc-extinguishing chamber 2 includes an insulating shell 21, a moving contact 26, a fixed contact 27, a dynamic gas generating unit 28, and a passive magnetic sensing unit 29. The moving contact 26 and the fixed contact 27 are disposed inside the insulating shell 21; the dynamic gas generating unit 28 is disposed on the inner wall of the insulating shell 21; and the passive magnetic sensing unit 29 is disposed on the moving contact 26.

[0049] The dynamic gas generation unit 28 includes a gas generation element 281, a fixed magnetic element 282, and a flow guiding element 283. The gas generation element 281 is movably disposed on the inner wall of the insulating shell 21, the fixed magnetic element 282 is disposed inside the gas generation element 281, and the flow guiding element 283 is fixedly connected to the bottom end of the gas generation element 281.

[0050] The passive magnetic induction unit 29 is configured such that when the moving contact 26 opens and carries the passive magnetic induction unit 29 to move relative to the fixed magnetic element 282, the magnetic force of the passive magnetic induction unit 29 drives the dynamic gas generating unit 28 and the flow guiding element 283 at its bottom to move, guiding the fluorocarbon gas generated by the arc decomposition of the gas generating element 281 to the arc area in the center of the arc extinguishing chamber 2, so as to form a uniform distribution and extinguish the arc efficiently.

[0051] In this invention, when a line fault requires tripping, the moving contact 26 moves downward under the action of the operating mechanism, carrying the passive magnetic induction unit 29 along with it. When the passive magnetic induction unit 29 moves relative to the fixed magnetic element 282 within the gas-generating element 281, it generates a magnetic force. This magnetic force overcomes friction, driving the entire dynamic gas-generating unit 28 and its bottom guiding element 283 to rotate. Simultaneously, the high temperature of the arc generated by the tripping action on the gas-generating element 281, causing its surface material to decompose and generate fluorocarbon-like gases with arc-extinguishing properties. The moving guiding element 283 precisely guides and blows these high-pressure gases to the arc column area at the center of the arc-extinguishing chamber 2, forcing the airflow to diffuse evenly and envelop the arc, achieving powerful cooling and deionization of the arc, thus achieving a much higher arc-extinguishing effect than traditional methods. This is particularly suitable for scenarios where primary and secondary equipment are closely installed, where stringent requirements for breaking performance and reliability are present.

[0052] In an embodiment of the present invention, the arc-extinguishing chamber 2 further includes a bellows 23 for sealing and providing space for the movement of the moving contact, and a moving end cover plate 24 and a fixed end cover plate 25 for mounting the moving and fixed contacts; the bellows 23 is disposed at the bottom inside the insulating shell 21, the moving end cover plate 24 is disposed at the top of the bellows 23, and the moving contact 26 is disposed at the top of the moving end cover plate 24; the fixed end cover plate 25 is disposed at the top inside the insulating shell 21, and the fixed contact 27 is disposed at the bottom of the fixed end cover plate 25.

[0053] In an embodiment of the present invention, the arc-extinguishing chamber 2 further includes an insulating sleeve 22 sleeved on the insulating shell 21, a dynamic gas generating unit 28 movably embedded in the inner wall of the insulating shell 21, and a passive magnetic sensing unit 29 sleeved on the moving contact 26.

[0054] In another embodiment of the present invention, the gas generating element 281 includes an active part 2811 and a follower part 2812. The active part 2811 is movably disposed on the inner wall of the insulating shell 21, and the follower part 2812 is fixedly disposed on the bottom end of the active part 2811.

[0055] The outer wall of the active part 2811 is provided with a ring-shaped groove 2813 at equal intervals. A pulley 2814 is rotatably provided in the groove 2813. The end of the pulley 2814 away from the groove 2813 is in contact with the inner wall of the insulating shell 21. The flow guiding element 283 is provided on the follower part 2812.

[0056] In this invention, the outer wall of the active part 2811 is provided with a plurality of wheel grooves 2813 at equal intervals in an annular shape. Each wheel groove 2813 is provided with a pulley 2814. When the magnetic force of the passive magnetic induction unit 29 drives the dynamic gas generation unit 28 to move, the pulley 2814 rolls on the inner wall of the insulating shell 21, causing the active part 2811 to drive the follower part 2812 to rotate.

[0057] In another embodiment of the present invention, the fixed magnetic element 282 includes a force-receiving groove 2821, the force-receiving groove 2821 has an inclined surface A2822 and an inclined surface B2823, the area of ​​the inclined surface A2822 is larger than the area of ​​the inclined surface B2823, and a permanent magnet 2824 is embedded on the inclined surface A2822.

[0058] The force-bearing groove 2821 in this invention is designed with an asymmetrical double-inclined structure, including inclination A2822 and inclination B2823, wherein the area of ​​inclination A2822 is significantly larger than the area of ​​inclination B2823, and the permanent magnet 2824 is embedded on the larger inclination B2823.

[0059] In an embodiment of the present invention, an arc-extinguishing cavity 211 is provided inside the insulating shell 21, and a movable groove 212 is provided on the inner wall of the top of the arc-extinguishing cavity 211. The gas generating element 281 is movably embedded in the movable groove 212, and a sliding groove 213 is provided on the movable groove 212. The pulley 2814 is slidably disposed on the sliding groove 213.

[0060] The inner wall of the arc extinguishing chamber 211 is provided with a guide groove 214. The guide groove 214 is provided with bend grooves 215 at equal intervals in a ring shape. The guide groove 214 is connected to several bend grooves 215. The end of the flow guiding element 283 away from the gas generating element 281 is movably inserted into the guide groove 214.

[0061] In this invention, when the gas generating element 281 is driven by magnetic force to move in a circular motion along the movable groove 212, it will drive the flow guiding element 283 at its bottom to move synchronously. When one end of the flow guiding element 283 moves to the bending groove 215, the shape of the bending groove 215 limits the flow guiding element 283 to flip. This flipping will stir or blow the fluorocarbon gas in the arc extinguishing chamber 211 toward the central position of the chamber. No matter where the fluorocarbon gas is generated, it can produce a uniform dispersion effect, which greatly enhances the mixing efficiency of the airflow and the cooling effect of the arc, and significantly improves the speed and reliability of arc extinguishing.

[0062] In an embodiment of the present invention, the flow guiding element 283 includes a rotating rod 2831, an arc-fixed plate 2832, a guide post 2833, and a flow guiding blade 2834. The rotating rod 2831 is rotatably inserted into the bottom end of the gas generating element 281 in a ring with equal intervals. The arc-fixed plate 2832 is fixedly sleeved on one end of the rotating rod 2831. The flow guiding blade 2834 is fixedly connected to the other end of the rotating rod 2831. The guide post 2833 is symmetrically fixed on the arc-fixed plate 2832. The end of the guide post 2833 away from the arc-fixed plate 2832 is movably inserted into the guide groove 214.

[0063] The guide vane 2834 is also provided with several flow-expanding holes 2835, which are teardrop-shaped.

[0064] In this invention, when the gas generating element 281 rotates, it drives the guide column 2833 to move within the guide groove 214 via the arc-fixed plate 2832. When the guide column 2833 passes through the bending groove 215, it will be subjected to a sudden guiding force. This force is transmitted to the rotating rod 2831 through the arc-fixed plate 2832, forcing the guide vane 2834 to generate a rapid, instantaneous rotation. This rotation can actively disturb the fluorocarbon gas, greatly enhancing the momentum and energy exchange between the fluorocarbon gas and the electric arc, thereby more effectively tearing and cooling the electric arc.

[0065] Furthermore, when the high-speed airflow passes through the teardrop-shaped diffuser orifice 2835, its streamlined structure, which first contracts and then expands, effectively reduces flow resistance and generates a series of smaller, more uniformly distributed vortices downstream of the outlet. These micro-vortices further enhance the contact area and mixing efficiency between the airflow and the electric arc, achieving a synergistic effect between macroscopic rotational disturbance and microscopic vortex diffusion, ultimately achieving comprehensive, rapid, and efficient arc extinguishing performance.

[0066] In another embodiment of the present invention, the passive magnetic sensing unit 29 includes a blocking disk 291, a spring assembly 292 and a magnetic sensing element 293. The blocking disk 291 is fixedly sleeved on the moving contact 26, the spring assembly 292 is fixedly sleeved on the top of the blocking disk 291, the magnetic sensing element 293 is fixedly sleeved on the top of the spring assembly 292, and the magnetic sensing element 293 is movably sleeved on the moving contact 26.

[0067] In another embodiment of the present invention, the magnetic sensing element 293 includes a force-applying groove 2931, which has an inclined surface A2932 and an inclined surface B2933. The area of ​​the inclined surface A2932 is larger than that of the inclined surface B2933, and a conversion element 2934 is provided on the inclined surface A2932.

[0068] In this invention, the force-receiving tooth grooves 2821 of the force-applying tooth groove 2931 are mutually adapted and mutually movably connected, the inclined surface A2822 is adapted to the inclined surface A2932, and the inclined surface B2823 is adapted to the inclined surface B2933.

[0069] There are 16 force-applying slots 2931 and force-receiving slots 2821, and 4 sets of permanent magnets 2824 and conversion elements 2934, with one set of permanent magnets 2824 or conversion elements 2934 arranged every 3 slots.

[0070] In an embodiment of the present invention, the conversion element 2934 includes a cast iron block 2935, a magnetic column 2936, a dividing wheel 2937, and a dividing rack 2938. The cast iron block 2935 is fixedly embedded in the inclined surface A2932, the magnetic column 2936 is rotatably mounted on the cast iron block 2935, the dividing wheel 2937 is fixedly connected to one end of the magnetic column 2936, and the dividing rack 2938 is movably inserted into the force-applying tooth groove 2931. One end of the dividing rack 2938 is fixedly connected to the blocking disc 291, and the other end of the dividing rack 2938 is meshed with the dividing wheel 2937.

[0071] In this invention, when the moving contact 26 begins its opening movement, it drives the blocking disc 291, which is fixedly connected to it, to move synchronously. The blocking disc 291 pulls the magnetic sensing element 293 through the spring assembly 292. At this time, the magnetic column 2936 of the magnetic sensing element 293 and the permanent magnet 2824 on the inclined surface A2822 of the force-bearing groove 2821 are in a state of opposite pole attraction. Therefore, the blocking disc 291 first pulls the gear rack 2938 to move, and the gear rack 2938 engages with the gear pulley 2937. The rotating wheel 2937 drives the fixedly connected magnetic column 2936 to rotate within the cast iron block 2935. The rotation of the magnetic column 2936 causes the magnetic poles to change. At this time, the magnetic column 2936 and the permanent magnet 2824 are in a state of repulsion due to the same poles. The conversion element 2934 on the inclined surface A2932 and the permanent magnet 2824 on the inclined surface A2822 generate a repulsive force. This repulsive force pushes the force-receiving tooth groove 2821 to drive the fixed magnetic element 282 and the gas generating element 281 to generate a rotational force.

[0072] When the moving contact 26 performs the closing movement, the moving contact 26 drives the blocking disk 291 fixedly connected to move synchronously. In the initial stage of movement, the blocking disk 291 first pushes the rack 2938 to reset. The rack 2938 meshes with the wheel 2937, driving the wheel 2937 to rotate. The wheel 2937 drives the fixedly connected magnetic column 2936 to rotate inside the cast iron block 2935. The rotation of the magnetic column 2936 resets the magnetic poles. At this time, the magnetic column 2936 and the permanent magnet 2824 are in a state of opposite pole attraction. This attraction pulls the force-receiving groove 2821, which drives the fixed magnetic element 282 and the gas generating element 281 to generate rotational force, realizing the insertion and reset of the force-receiving groove 2821 and the force-applying groove 2931.

[0073] As another embodiment of the present invention, the materials of the various components of the present invention are disclosed as follows:

[0074] The gas-generating element 281 is made of a solid fluorocarbon polymer material, preferably polytetrafluoroethylene (PTFE). This material rapidly decomposes under the high temperatures generated by the electric arc, producing fluorocarbon gases with tetrafluoroethylene and hexafluoropropylene as the main components. These gases possess excellent electronegativity, efficiently adsorbing free electrons, and have high heat capacity, enabling them to powerfully cool the electric arc, making them a source of gaseous medium for achieving efficient arc extinguishing.

[0075] The permanent magnet 2824 embedded in the fixed magnetic element 282 and the rotatable magnetic column 2936 in the passive magnetic induction unit 29 are both made of high-performance permanent magnet material, preferably neodymium iron boron. This material has extremely high magnetic energy product and coercivity, and can provide a sufficiently strong magnetic force to ensure reliable driving of the dynamic gas generation unit 28.

[0076] The cast iron block 2935 that mounts the magnetic post 2936 is made of a soft magnetic material, preferably industrial pure iron or electrical steel. This material has high magnetic permeability and low coercivity, and its function is to efficiently conduct and converge magnetic lines of force, forming a low magnetic reluctance path, thereby enhancing the magnetic coupling strength between the magnetic post 2936 and the permanent magnet 2824, and ensuring a significant change in force during magnetic pole switching;

[0077] The guide vane 2834 is made of high-performance engineering ceramics, preferably silicon nitride ceramics or alumina ceramics;

[0078] The blocking disc 291 is made of high-strength insulating ceramic material, preferably alumina ceramic, which has excellent electrical insulation properties and blocks the transmission of current to subsequent components.

[0079] Working principle: This embodiment provides a working method for a primary and secondary integrated pole-mounted circuit breaker, including the following steps:

[0080] S1. Fault detection and tripping start: When a line fault occurs, the current transformer 3 and voltage transformer 4 detect abnormal electrical signals, the control unit issues a tripping command, and the operating mechanism drives the moving contact 26 to start separating from the fixed contact 27.

[0081] S2. Arc Ignition and Magnetic Pole Reversal: At the instant the moving contact 26 separates from the fixed contact 27, an electric arc is generated in the contact gap. Simultaneously, the movement of the moving contact 26 is transmitted through the blocking disk 291 and the rack 2938, driving the magnetic column 2936 to rotate, changing its magnetic pole relationship with the permanent magnet 2824 on the fixed magnetic element 282 from the initial attraction between opposite poles to the repulsion between like poles.

[0082] S3. Magnetic Drive and Unit Rotation: The converted strong magnetic repulsive force acts on the inclined surface A2822 of the fixed magnetic element 282, generating a tangential component force. This magnetically driven dynamic gas-generating unit 28, including the gas-generating element 281, the fixed magnetic element 282, and the flow-guiding element 283, rotates along the inner wall of the insulating shell 21.

[0083] S4. Decomposition of gas-generating material and generation of arc-extinguishing gas: The high-temperature electric arc generated by the circuit breaker action on the rotating gas-generating element 281, causing its surface to rapidly decompose and generate fluorocarbon gases.

[0084] S5. Dynamic flow guidance and airflow optimization: The rotation of the dynamic gas generation unit 28 synchronously drives the flow guiding element 283 at its bottom to move; the flow guiding blade 2834 rotates under the action of the guide groove 214 and the bending groove 215, actively and precisely agitating and guiding the fluorocarbon gas generated by the gas generation element 281 to the arc area in the center of the arc extinguishing chamber 2; when the airflow passes through the teardrop-shaped expansion hole 2835 on the flow guiding blade 2834, it is further optimized into a uniformly distributed turbulent flow.

[0085] S6. High-efficiency arc extinguishing and current interruption: The optimized fluorocarbon gas uniformly and fully envelops and penetrates the arc column. Through the strong cooling effect and adsorption of free electrons, the arc is rapidly deionized, thereby achieving rapid and reliable arc extinguishing and ultimately interrupting the fault current.

[0086] S7. Closing Reset and Mechanism Preparation: After the fault is cleared, the operating mechanism drives the moving contact 26 to close the circuit. In the initial stage of closing, the transmission mechanism drives the magnetic column 2936 to rotate in the opposite direction, and the magnetic pole relationship is restored to opposite poles attracting each other. The magnetic attraction pulls the dynamic gas generation unit 28 to rotate in the opposite direction to the initial position, preparing for the next opening and arc extinguishing.

[0087] 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 secondary fused package circuit breaker, characterized by, Including mechanism box (1), be provided with arc extinguishing chamber (2) on the mechanism box (1); The arc extinguishing chamber (2) comprises an insulating shell (21), a dynamic gas generating unit (28) and a passive magnetic sensing unit (29); The dynamic gas generating unit (28) is arranged on the inner wall of the insulating shell (21); The passive magnetic sensing unit (29) is arranged on the moving contact; The dynamic gas generating unit (28) comprises a gas generating element (281), a permanent magnet element (282) and a flow guide element (283), the gas generating element (281) is movably arranged on the inner wall of the insulating shell (21), the permanent magnet element (282) is arranged in the gas generating element (281), and the flow guide element (283) is fixedly connected to the bottom end of the gas generating element (281); When the moving contact is opened and carries the passive magnetic sensing unit (29) relative to the permanent magnet element (282), the magnetic force of the passive magnetic sensing unit (29) drives the dynamic gas generating unit (28) and the flow guide element (283) at the bottom end to move, and the fluorocarbon gas generated by the decomposition of the gas generating element (281) under the arc is guided to the arc area in the center of the arc extinguishing chamber (2), so that the arc is extinguished uniformly and efficiently.

2. The two-stage hybrid circuit breaker of claim 1, wherein, The arc extinguishing chamber (2) further comprises a bellows (23) for sealing and providing a moving space for the moving contact, a dynamic end cover plate (24) and a static end cover plate (25) for mounting the moving contact and the static contact, the bellows (23) is arranged at the inner bottom end of the insulating shell (21), the dynamic end cover plate (24) is arranged at the top end of the bellows (23), and the moving contact is arranged at the top end of the dynamic end cover plate (24); the static end cover plate (25) is arranged at the inner top end of the insulating shell (21), and the static contact is arranged at the bottom end of the static end cover plate (25).

3. The two-stage hybrid pole-mounted circuit breaker according to claim 1, wherein, The arc extinguishing chamber (2) further comprises an insulating sleeve (22) sleeved on the insulating shell (21), the dynamic gas generating unit (28) is movably embedded in the inner wall of the insulating shell (21), and the passive magnetic sensing unit (29) is sleeved on the moving contact.

4. The two-stage hybrid circuit breaker of claim 1, wherein, The gas generating element (281) comprises a driving part (2811) and a following part (2812), the driving part (2811) is movably arranged on the inner wall of the insulating shell (21), and the following part (2812) is fixedly arranged at the bottom end of the driving part (2811); The outer wall of the driving part (2811) is annular and equally spaced to form a plurality of wheel grooves (2813), a pulley (2814) is rotatably arranged in each wheel groove (2813), one end of the pulley (2814) away from the wheel groove (2813) movably contacts the inner wall of the insulating shell (21), and the flow guide element (283) is arranged on the following part (2812).

5. The two-stage hybrid pole-mounted circuit breaker of claim 1, wherein, The permanent magnet element (282) comprises a force receiving tooth groove (2821), the force receiving tooth groove (2821) has a slope A (2822) and a slope B (2823), the area of the slope A (2822) is greater than the area of the slope B (2823), and a permanent magnet (2824) is embedded in the slope A (2822).

6. The two-stage hybrid circuit breaker of claim 4, wherein, The insulating shell (21) is internally provided with an arc extinguishing chamber (211), the top end inner wall of the arc extinguishing chamber (211) is provided with a movable slot (212), the gas generating element (281) is movably embedded on the movable slot (212), the movable slot (212) is provided with a sliding groove (213), and the pulley (2814) is slidably arranged on the sliding groove (213). The inner wall of the arc extinguishing chamber (211) is provided with a guide groove (214), the guide groove (214) is annularly and equidistantly provided with a bending groove (215), the guide groove (214) is communicated with the bending grooves (215), and the flow guiding element (283) is movably inserted into the guide groove (214) away from the gas generating element (281).

7. The two-stage hybrid circuit breaker of claim 6, wherein, The flow guiding element (283) comprises a rotating rod (2831), an arc fixed plate (2832), a guide column (2833) and a flow guiding vane (2834), the rotating rod (2831) is annularly and equidistantly rotatably inserted into the bottom end of the gas generating element (281), the arc fixed plate (2832) is fixedly sleeved on one end of the rotating rod (2831), the flow guiding vane (2834) is fixedly connected to the other end of the rotating rod (2831), the guide column (2833) is symmetrically fixed on the arc fixed plate (2832), and the guide column (2833) is movably inserted into the guide groove (214) away from the arc fixed plate (2832). The flow guiding vane (2834) is further provided with a plurality of flow expanding holes (2835), and the flow expanding holes (2835) are in the shape of water droplets.

8. The two-stage hybrid circuit breaker of claim 7, wherein, The passive magnetic sensing unit (29) comprises a blocking disc (291), a spring group (292) and a magnetic sensing element (293), the blocking disc (291) is fixedly sleeved on the movable contact, the spring group (292) is fixedly arranged on the top end of the blocking disc (291), and the magnetic sensing element (293) is fixedly arranged on the top end of the spring group (292).

9. The two-stage hybrid circuit breaker of claim 8, wherein, The magnetic sensing element (293) comprises a force applying tooth groove (2931), the force applying tooth groove (2931) has an inclined surface A (2932) and an inclined surface B (2933), the area of the inclined surface A (2932) is larger than that of the inclined surface B (2933), and the inclined surface A (2932) is provided with a conversion element (2934).

10. The two-stage hybrid circuit breaker of claim 9, wherein, The conversion element (2934) comprises a cast iron block (2935), a magnetic column (2936), a dividing wheel (2937) and a dividing tooth bar (2938), the cast iron block (2935) is fixedly embedded on the inclined surface A (2932), the magnetic column (2936) is rotatably arranged on the cast iron block (2935), the dividing wheel (2937) is fixedly connected to one end of the magnetic column (2936), the dividing tooth bar (2938) is movably inserted into the force applying tooth groove (2931), one end of the dividing tooth bar (2938) is fixedly connected to the blocking disc (291), and the other end of the dividing tooth bar (2938) is meshingly connected to the dividing wheel (2937).

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