An on-board connected circuit breaker

Abstract

The application discloses a board-mounted connected circuit breaker and relates to the technical field of electrical components, which comprises a shell and further comprises: an adaptive arc extinguishing mechanism installed in an arc extinguishing chamber and used for dynamically adjusting the gap between the grid plates and the effective intervention depth according to the breaking arc energy; an elastic transmission structure used for converting the attraction displacement of the moving armature generated by the self-generated magnetic field into the energy storage deformation of the reset spring assembly, so as to realize the coordinated switching of the wide / narrow gap and the deep / shallow intervention state; and a self-cleaning mechanism used for forcing the movable plate to be separated from the high position constraint when the local temperature rise is abnormal due to the accumulation of the deposits on the surface of the grid plates; the self-cleaning mechanism comprises a thermal expansion triggering assembly, the heated contact piece is used for sensing the heat accumulation state in the arc extinguishing chamber caused by the accumulation of the conductive microfilm and conducting the heat to the spring expansion capsule to make the spring expansion capsule be heated and expanded, when the expansion thrust breaks through the mechanical constraint of the limiting block, the stop locking of the movable plate is released, and the movable plate is lowered to the corresponding position of the dust collecting groove to perform the surface scraping and cleaning.

Description

Technical Field

[0001] This invention relates to the field of electrical components, and more particularly to a circuit breaker with an onboard connection. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Existing on-board circuit breakers typically employ a fixed-geometry arc-extinguishing chamber for interruption and arc extinguishing. Its core structure includes an arc-extinguishing chamber and several parallel metal grids arranged inside. When the circuit breaker contacts break and generate an arc, the arc is driven into the arc-extinguishing chamber by the electromagnetic force and thermal convection in the contact circuit. The arc column is divided into multiple short arc segments connected in series by the grids. Utilizing the near-electrode voltage drop effect and the thermal conduction cooling effect of the grids, the arc voltage rises rapidly. When the arc voltage exceeds the system recovery voltage, the arc current decays to zero, and simultaneously, the insulation medium strength within the arc-extinguishing chamber recovers, thus achieving reliable interruption.

[0003] However, existing circuit breakers, employing fixed geometry, face drastically different arc conditions throughout their service life: a gentle arc with low energy during rated current interruption; a longer arcing time and significant heat accumulation during overload interruption; and an exponential arc energy burst during short circuit interruption, exhibiting strong arc adhesion. The fixed geometry arc-extinguishing chamber uses a "one-size-fits-all" design, with the grid plates fully engaged during light loads or normal operation, leading to excessively high arc voltage, prolonged breaking time, and exacerbated contact erosion (i.e., the "oversized motor for a small load" phenomenon). Furthermore, during heavy load short circuits, the insufficient number of segments and cooling surface area fail to match the peak arc energy.

[0004] Secondly, because existing circuit breakers cannot self-treat the grid surface, after multiple breaks, contact metal vapor and organic insulating material carbides deposit on the grid surface, forming a conductive microfilm. This deposited layer weakens the grid's splitting efficiency. Summary of the Invention

[0005] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The present invention provides a plate-mounted circuit breaker to solve the technical problems that existing plate-mounted circuit breakers cannot adapt to arc extinguishing requirements due to the simple internal structure of their arc extinguishing chambers, and cannot remove deposits on the grid surface.

[0006] The embodiments of the present invention adopt the following technical solution: a plate-mounted circuit breaker, including a housing with an arc-extinguishing chamber, and further comprising;

[0007] An adaptive arc extinguishing mechanism is installed in the arc extinguishing chamber. The adaptive arc extinguishing mechanism includes a stationary grid plate and several moving grid plates arranged sequentially on one side of the stationary grid plate. The moving grid plates are slidably connected to the housing. Between each pair of adjacent grid plates, there is a U-shaped magnetic yoke, a moving armature, and a transmission assembly. The U-shaped magnetic yoke and the moving armature are longitudinally aligned. The transmission assembly drives the moving armature and the corresponding moving grid plate.

[0008] When the system experiences overload or metallic short circuit, the U-shaped magnetic yoke captures the self-generated magnetic field excited by the arc current in space and generates magnetic attraction force, driving the moving armature to approach the U-shaped magnetic yoke. The transmission component converts the longitudinal movement of the moving armature into the translational movement of the moving grid plate away from the stationary grid plate.

[0009] A self-cleaning mechanism is provided on the moving grid plate. The self-cleaning mechanism includes a thermal expansion triggering component and a limiting block. The transmission component includes a movable plate fixedly connected to the moving armature. The movable plate contacts the moving grid plate. The limiting block extends to the outside of the moving grid plate and blocks the movable plate on the side facing away from the U-shaped magnetic yoke. The thermal expansion triggering component includes a heated contact and a spring expansion bladder. The spring expansion bladder is located on one side of the limiting block.

[0010] The heated contact is used to sense the heat accumulation state caused by the accumulation of conductive microfilm in the arc extinguishing chamber and conduct the heat to the spring expansion bladder. When the spring expansion bladder expands sufficiently due to heat, it pushes the limiting block back into the moving grid plate, releasing the stop limit on the moving plate, thereby extending the moving stroke of the moving plate. During the longitudinal movement, the moving plate scrapes and cleans the surface of the moving grid plate.

[0011] Furthermore, the housing is equipped with a switch, a linkage assembly, an electromagnet, a moving contact, and an arc-extinguishing chamber. The switch controls the moving contact through the linkage assembly. The electromagnet is located above the moving contact. When the electromagnet operates, it causes the moving contact to move. An arc-extinguishing chamber is provided at the end of the moving contact. The arc-extinguishing chamber extinguishes the arc generated when the moving contact separates from the stationary contact.

[0012] Furthermore, the sliding connector includes a guide rail disposed within the arc-extinguishing chamber. The guide rail is provided with a stationary grid plate and several movable grid plates. Arc extinguishing is achieved through the cooperation of the stationary and movable grid plates. The movable grid plates are slidably connected to the guide rail. Movable plates are disposed between adjacent grid plates. A movable armature is disposed above the movable plate. A U-shaped magnetic yoke is disposed above the movable armature. The movable armature and the U-shaped magnetic yoke are connected by a return spring assembly. The movable plate and the movable armature are connected by a sliding connector. Several U-shaped magnetic yokes are fixed in position by connecting plates. A connecting guide rail is disposed on the movable grid plate. The movable armature, the return spring assembly, and the U-shaped magnetic yoke constitute a magnetic adsorption component.

[0013] Furthermore, the connecting guide rail is divided into upper and lower parts by the center line point, with the upper part being an inclined plane and the lower part being a vertical plane.

[0014] Furthermore, the movable piece is made of a high-temperature resistant magnetic transparent medium, and both ends are provided with arc surfaces to abut the sidewalls of the grid.

[0015] Furthermore, the surface of the grid plate is provided with several protrusions, and a dust accumulation groove is provided at the bottom of the grid plate.

[0016] Furthermore, the self-cleaning mechanism includes a limiting block, which is connected to the heated contact element via a spring-inflated air bladder. The lower surface of the limiting block is arc-shaped, and the upper surface is flat.

[0017] Furthermore, the spring-expanding airbag is filled with a heat-expanding material, and the heat-conducting contact is made of a heat-conducting material, penetrating the grid and flush with the grid surface.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] Firstly, by incorporating an adaptive arc-extinguishing mechanism into the arc-extinguishing chamber (by changing the grid structure from a fixed single form to a movable one), the grid gap, effective penetration depth, or flow channel cross-sectional area can change in real time with the arc energy and operating conditions. During rated current or light load interruption, the arc-extinguishing chamber automatically switches to a wide gap / shallow penetration state, reducing near-electrode voltage drop resistance and arc column friction loss, significantly shortening the arcing time, mitigating contact erosion and operating mechanism wear, and effectively solving the problems of excessive arc extinguishing and lifespan degradation caused by the traditional fixed structure's "one-size-fits-all" design. During overload or metallic short-circuit interruption, the mechanism automatically switches to a narrow gap / deep penetration state, significantly increasing the number of arc segments and cooling surface area, rapidly establishing high arc voltage and forcing the arc to adhere to the wall for cooling, ensuring that the dielectric strength recovery speed always leads the system recovery voltage (the morphological adjustment and self-processing actions described in this invention are entirely passively driven by the physical energy (electromagnetic repulsion, thermal expansion stress, or impact pressure) released by the arc itself during the interruption process, without relying on external sensors, control circuits, or additional power supply systems).

[0020] Secondly, by adding a self-cleaning mechanism to the arc-extinguishing chamber, this invention addresses the technical pain point of traditional arc-extinguishing chambers where metal vapor and insulating carbides easily accumulate on the grid surface after multiple breaks, forming a conductive microfilm that leads to a decrease in segmentation efficiency. During the adaptive switching process, the invention simultaneously triggers a self-processing action on the grid surface. This mechanism effectively removes the conductive deposits adhering to the grid's working surface, restoring the grid's initial insulation state and the uniformity of the electric field distribution within the cavity, preventing surface flashover and the accumulation of local hot spots. By actively maintaining the grid's segmentation efficiency and deionization capability, it avoids forced derating or premature replacement due to performance degradation.

[0021] In summary, by adding an adaptive arc extinguishing mechanism and a self-cleaning mechanism to the arc extinguishing chamber, the circuit breaker can adjust the arc extinguishing effect according to different circuit breaking conditions, ensuring rapid arc extinguishing while effectively extending the service life of the grid plates. Secondly, by adjusting the auxiliary cleaning mechanism on the adaptive arc extinguishing mechanism, the grid plate surface can be automatically treated after each circuit breaking, thereby effectively preventing the formation of conductive deposits on the grid plate surface. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the position and structure of the moving contact and the arc-extinguishing chamber of the present invention;

[0025] Figure 3 This is a schematic diagram of the adaptive arc extinguishing mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram showing the positional structure of the moving and movable plates of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0028] Figure 6 This is a schematic diagram showing the positions of the movable piece and the limiting block of the present invention.

[0029] Figure label:

[0030] 1. Housing; 11. Switch; 12. Linkage assembly; 13. Electromagnet; 14. Moving contact; 15. Arc-extinguishing chamber;

[0031] 2. Adaptive arc extinguishing mechanism; 21. Static grid plate; 22. U-shaped magnetic yoke; 23. Connecting plate; 24. Moving grid plate; 25. Guide slide rail; 26. Return spring assembly; 27. Sliding connector; 28. Moving armature; 29. ​​Movable plate;

[0032] 3. Self-cleaning mechanism; 31. Dust collection tank; 32. Restriction block; 33. Spring expansion bladder; 34. Heat-receiving contact component. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0035] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] The following is combined with Figures 1 to 6 As shown, an embodiment of the present invention provides a circuit breaker with onboard connection, including a housing 1, and further comprising;

[0039] An adaptive arc extinguishing mechanism 2, installed inside the arc extinguishing chamber 15, is used to dynamically adjust the grid gap and effective intervention depth according to the energy of the interrupted arc. The adaptive arc extinguishing mechanism 2 includes a reset spring assembly 26 and a sliding connector 27. An elastic transmission structure is provided between the reset spring assembly 26 and the end of the moving armature 28 facing the magnetic yoke. The elastic transmission structure is used to convert the attraction displacement of the moving armature 28 caused by the self-generated magnetic field into the energy storage deformation of the reset spring assembly 26. An inclined guide coupling structure is provided between the sliding connector 27 and the moving grid 24. The inclined guide coupling structure is used to automatically drive the moving grid 24 to slide laterally along the guide rail 25 when the sliding connector 27 is displaced by the moving plate 29, so as to realize the coordinated switching of wide / narrow gap and deep / shallow intervention state.

[0040] The self-cleaning mechanism 3 is located at the end of the downward trajectory of the movable plate 29. It is used to force the movable plate 29 to break free from the high-position constraint when the accumulation of deposits on the grid surface causes abnormal local temperature rise. The self-cleaning mechanism 3 includes a thermal expansion triggering component, which includes a heated contact 34 and a spring expansion bladder 33. The heated contact 34 is used to sense the heat accumulation state caused by the accumulation of conductive microfilm in the arc-extinguishing chamber 15 and conduct heat to the spring expansion bladder 33 to make it expand. When the expansion thrust breaks through the mechanical constraint of the limiting block 32, the stop lock of the movable plate 29 is released, allowing it to continue to move down to the corresponding position of the dust accumulation groove 31 under the action of gravity to perform surface scraping cleaning.

[0041] During operation, when the circuit breaker performs a breaking operation, the moving and stationary contacts separate, generating an electric arc. The arc current excites a self-generated magnetic field in the surrounding space, the intensity of which is proportional to the current value. This magnetic field penetrates the non-magnetic region on the back arc side of the movable plate 29 and is captured by the U-shaped magnetic yoke 22 above, then guided to the air gap in the magnetic circuit. The soft magnetic armature 28 in the air gap is passively magnetized under the action of the external magnetic field, generating a magnetic attraction force between it and the pole face of the U-shaped magnetic yoke 22. The magnitude of this magnetic attraction force is proportional to the square of the arc current.

[0042] Under rated current or light load breaking conditions, the arc energy is relatively small, and the self-generated magnetic field is weak. The magnetic attraction force can only partially overcome the preload of the return spring assembly 26, causing the moving armature 28 and the movable plate 29 to move slightly upward. At this time, the inclined guide coupling structure decomposes the vertical displacement into a small horizontal component force, limiting the lateral sliding of the driving grid plate 24, and the arc extinguishing chamber 15 automatically switches to the narrow gap / shallow intervention state. In this state, the arc can be quickly and naturally extinguished, significantly shortening the arcing time and reducing contact erosion and wear of the operating mechanism.

[0043] Under overload or metallic short-circuit breaking conditions, the fault current surges, the self-generated magnetic field intensifies dramatically, and the magnetic attraction force is amplified quadratically, far exceeding the initial preload of the reset spring assembly 26. The moving armature 28 and the movable plate 29 are strongly attracted and moved upward. Through the inclined guide coupling structure, the large vertical displacement is converted into a deep lateral sliding of the moving grid plate 24. The gap between adjacent grid plates increases rapidly, and the effective penetration depth increases significantly. The arc-extinguishing chamber 15 switches to the large gap / deep penetration state. In this state, the arc cooling specific surface area increases exponentially, the arc voltage is rapidly established, and the arc is forced to adhere to the wall for cooling, ensuring that the dielectric strength recovery speed always leads the system recovery voltage, achieving highly reliable breaking. After the break is completed, the self-generated magnetic field decays and disappears, the magnetic attraction force returns to zero, and the reset spring assembly 26 releases its stored energy, driving the moving armature 28, the movable plate 29, and the moving grid plate 24 to automatically reset to their initial standby positions. Addressing the issues of grid surface welding, metal vapor bridging short circuits, and sudden pressure increases in the arc-extinguishing chamber 15 that are easily caused by high-energy arcs, a synergistic mechanism of "dynamic gap widening + deep intervention" is achieved through passive magnetic field drive. Widening the gap is used to release high-temperature, high-pressure gases and prevent thermal short circuits, while deep intervention is used to maintain the arc's cooling path against the wall. The combination of these two mechanisms achieves a multi-field balance of heat, force, and electricity under heavy-load conditions.

[0044] Specifically, the housing 1 is equipped with a switch 11, a connecting rod assembly 12, an electromagnet 13, a moving contact 14, and an arc-extinguishing chamber 15. The switch 11 controls the moving contact 14 through the connecting rod assembly 12. The electromagnet 13 is located above the moving contact 14. The operation of the electromagnet 13 causes the moving contact 14 to move (there are two driving methods, one is manual control and the other is automatic control). The end of the moving contact 14 is provided with an arc-extinguishing chamber 15, which extinguishes the arc generated when the moving contact 14 separates from the stationary contact.

[0045] Specifically, the sliding connector 27 includes a guide rail 25 disposed within the arc-extinguishing chamber 15. The guide rail 25 has a stationary grid plate 21 and several movable grid plates 24. Arc extinguishing is achieved through the cooperation of the stationary grid plate 21 and the movable grid plates 24. The movable grid plates 24 are slidably connected to the guide rail 25. Movable plates 29 are disposed between adjacent grid plates. A movable armature 28 is disposed above the movable plate 29. A U-shaped magnetic yoke 22 is disposed above the movable armature 28. The movable armature 28 and the U-shaped magnetic yoke 22 are connected by a return spring assembly 26. Several U-shaped magnetic yokes 22 are positioned using connecting plates 23. A longitudinally extending connecting guide rail is disposed on the side of the movable grid plate 24 facing the stationary grid plate 21 for sliding connection with the movable plate 29. The movable armature 28, the return spring assembly 26, and the U-shaped magnetic yoke 22 constitute a magnetic adsorption component.

[0046] During operation, the U-shaped magnetic yoke 22 and the soft magnetic armature constitute a passive magnetic circuit drive unit. During the interruption process, the arc current generates a self-generated magnetic field in space. This magnetic field penetrates the non-magnetically conductive coupling area on the back arc side of the movable plate 29 and is captured by the U-shaped magnetic yoke 22 and guided to the air gap of the magnetic circuit. The soft magnetic armature is passively magnetized under the action of the external magnetic field, generating a magnetic attraction force between it and the pole face of the U-shaped magnetic yoke 22 that is proportional to the square of the arc current. When the magnetic attraction force is greater than the preload of the elastic reset component, the movable armature 28 moves upward along the vertical guide groove, directly driving the movable plate 29 to rise synchronously. The inclined surface of the connecting rail between the side wall of the movable plate 29 and the movable armature 28 decomposes the vertical thrust into a horizontal component, driving the movable grid plate 24 to move along a preset trajectory, synchronously increasing the gap between adjacent grid plates and the effective arc extinguishing depth. After the arc is extinguished, the self-generated magnetic field decays, the magnetic attraction force returns to zero, and the elastic reset component releases its stored energy to drive the armature 28 and the movable plate 29 to automatically reset to their initial positions.

[0047] Specifically, the connecting guide rail is divided into upper and lower parts by the center line point, with the upper part being an inclined plane and the lower part being a vertical plane.

[0048] During operation, when the movable plate 29 moves upward with the armature 28, the upper inclined surface of the connecting guide rail contacts the guide inclined surface of the movable plate 29, forcibly decomposing the vertical thrust into a horizontal thrust, pushing the movable grid plate 24 to increase the gap along the guide slide rail 25. When the movable plate 29 returns to its original position and moves downward, the lower vertical surface of the guide rail and the sliding connector 27 are released from the inclined surface constraint, and the movable grid plate 24 automatically retracts to the initial wide gap position under the action of the reset spring or its own structural tolerance, realizing motion decoupling and precise reset. Due to the sliding connection between the connecting plate 23 and the U-shaped magnetic yoke 22, during the movement of the movable plate 29, the inclined surface of the connecting guide rail pushes the movable grid plate 24, causing the gap between them to change. The movable U-shaped magnetic yoke 22 is used to make it move with the movable plate 29, ensuring the gap. In order to make it reset, a reset spring is set in the groove of the connecting plate 23 to reset the U-shaped magnetic yoke 22.

[0049] Specifically, the movable piece 29 is made of high-temperature resistant non-magnetic composite material, and its two ends are processed into an adaptive arc surface structure, which is used to flexibly abut against the side wall of the movable grid piece 24 during lateral sliding, so as to avoid mechanical jamming or grid piece deformation caused by rigid impact.

[0050] Specifically, the working surface of the grid plate is evenly provided with several vertical guide arc ribs and micro protrusions, and the bottom of the grid plate is connected to an open dust collection groove 31 for collecting metal deposits and carbonized debris that fall off during the cleaning process.

[0051] Specifically, the self-cleaning mechanism 3 includes a limiting block 32. Both the moving grid plate 24 and the stationary grid plate 21 are provided with limiting blocks 32. The limiting block 32 is connected to the heated contact member 34 through a spring expansion bladder 33. The lower surface of the limiting block 32 is an arc surface and the upper surface is a plane.

[0052] Specifically, the spring expansion bladder 33 is filled with a low-melting-point phase change expansion medium or a high thermal expansion coefficient silicone oil. The heated contact 34 is made of a high thermal conductivity copper alloy or aluminum nitride ceramic material. Its detection end penetrates the back of the grid and is flush with the outer surface of the grid. Since the heated contact 34 is flush with the grid surface (i.e., the heated contact 34 and the grid surface are flush and there is no protrusion), it will not affect the movement of other workpieces, and at the same time, it can ensure direct sensing of the heat accumulation state of the working surface.

[0053] During operation, the spring expansion bladder 33, the heated contact element 34, and the limiting block 32 are connected through a sealed micro-flow channel to form a closed thermo-pressure transfer circuit.

[0054] Working principle; the specific working process is divided into the following four stages according to the sequence of actions:

[0055] Under rated current or light load conditions, the reset spring assembly 26 provides initial preload, keeping the moving armature 28, movable plate 29, and moving grid plate 24 in a low initial position. At this time, the inclined guide coupling structure keeps the moving grid plate 24 close together, and the arc-extinguishing chamber 15 is in a narrow gap state; simultaneously, the grid plate assembly's overall depth into the arc path is shallow, exhibiting a shallow-intervention state. After the small-energy arc generated during interruption enters the arc-extinguishing chamber 15, it is rapidly divided by the densely packed, narrow-gap grid plates, resulting in a rapid accumulation of voltage drop near the electrode region. This shallow-intervention state effectively shortens the frictional stroke between the arc and the grid plate sidewalls, reducing near-electrode region voltage drop resistance and thermal resistance, allowing the low-energy arc to extinguish quickly and naturally. This state significantly reduces the arcing time during light load interruption, avoids the "excessive arc extinguishing" caused by traditional fixed deep-intervention structures, and effectively reduces contact erosion and mechanical wear of the operating mechanism.

[0056] When the system experiences an overload or metallic short circuit, the breaking current surges dramatically, and the arc energy amplifies rapidly. The arc current generates a self-generated magnetic field in space, the intensity of which is proportional to the square of the current. This magnetic field penetrates the non-magnetic region on the back arc side of the movable plate 29 and is captured by the U-shaped magnetic yoke 22, causing the soft magnetic moving armature 28 to be passively magnetized. The extremely strong magnetic attraction force instantly overcomes the preload of the return spring assembly 26, driving the moving armature 28 to move significantly upward along the vertical guide groove, and simultaneously causing the movable plate 29 to move upward. During the upward movement of the movable plate 29, its sidewall guide ramp / connecting rail and sliding connector 27 undergo relative motion, converting the vertical upward displacement into a horizontal lateral thrust. This drives the movable grid plate 24 to slide outward along the guide rail 25, rapidly increasing the gap between adjacent grid plates and switching the arc-extinguishing chamber 15 to a wide-gap state. Simultaneously, the upward movement of the movable plate 29 propels the grid plate 24 assembly along a preset trajectory toward the core cooling area of ​​the arc-extinguishing chamber 15, significantly increasing the grid plate's arc coverage path and wall contact area, and simultaneously switching to a deep-intervention state. In this wide-gap / deep-intervention synergistic state: the widened gap effectively dissipates the high-temperature, high-pressure gas and metal vapor generated by the high-energy arc, preventing excessive heat accumulation in the confined space that could lead to grid surface welding, insulation breakdown, or a sudden pressure surge; the deep-intervention structure forcibly elongates the arc and increases the cooling specific surface area, achieving efficient deionization through the grid plate sidewall and the flow channel of the arc-extinguishing chamber 15. The optimal balance between heat / airflow conduction capacity and medium strength recovery speed is achieved, ensuring reliable disconnection and structural safety of the arc-extinguishing chamber 15 under extreme conditions.

[0057] After the electric arc is completely extinguished, the self-generated magnetic field in space rapidly decays to zero, and the magnetic attraction disappears. The reset spring assembly 26 releases its stored energy, driving the moving armature 28 and the movable plate 29 to move vertically downwards for reset. The downward movement of the movable plate 29 releases the lateral driving constraint and longitudinal propulsion force on the moving grid plate 24. Under the limiting action of the reset spring, the structure's own weight, or the guide groove, the moving grid plate 24 automatically retracts along the slide rail to its initial approach position, restoring its narrow gap / shallow intervention standby state, achieving motion decoupling and precise reset, and preparing for the next break.

[0058] After repeated tripping, the contact metal vapor and insulating carbides easily deposit on the working surface of the grid plates, forming a conductive microfilm, leading to abnormal local heat accumulation. When the deposited layer causes the working surface temperature to exceed the set threshold, the heated contact 34, flush with the grid plate surface, rapidly conducts heat to the spring expansion bladder 33 within the sealed circuit. The phase change expansion medium inside the bladder generates continuous thrust upon heating, which acts on the upper plane of the limiting block 32 through the micro-flow channel. When the accumulated expansion thrust exceeds the mechanical constraint threshold of the limiting block 32, its lower surface arc structure retracts, releasing the stop lock on the downward trajectory of the movable piece 29. Unconstrained, the movable piece 29 continues to move downward along the guide rail 25 under gravity to the corresponding position in the dust collection groove 31. Its two ends of the adaptive arc surface and the internal auxiliary scraper closely adhere to the vertical guide arc ribs on the grid plate surface for scraping and sliding, effectively peeling off the conductive deposited layer. The detached debris falls into the bottom open dust collection groove 31. When used again, the movable piece 29 moves upward by the armature and the U-shaped magnetic yoke 22. Since the lower surface of the limiting block 32 is curved, it will not affect the upward movement of the movable piece 29, but will only block its downward movement. When the temperature drops back to the normal range, the medium inside the spring expansion bladder 33 cools and contracts, and the limiting block 32 resets and relocks the movable piece 29, completing the self-cleaning cycle closed loop.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circuit breaker with onboard connection, comprising a housing (1) having an arc-extinguishing chamber (15), characterized in that, Also includes; An adaptive arc extinguishing mechanism (2) is installed inside the arc extinguishing chamber (15). The adaptive arc extinguishing mechanism (2) includes several sliding connectors (27), a stationary grid plate (21), and several moving grid plates (24) arranged sequentially on one side of the stationary grid plate (21). The moving grid plates (24) are slidably connected to the housing (1). A U-shaped magnetic yoke (22), a moving armature (28), and a transmission assembly are provided between each pair of adjacent grid plates. The U-shaped magnetic yoke (22) and the moving armature (28) are longitudinally aligned. The transmission assembly drives the moving armature (28) and the corresponding moving grid plate (24). When the system is overloaded or has a metallic short circuit, the U-shaped magnetic yoke (22) captures the self-generated magnetic field generated by the arc current in space and generates magnetic attraction force, driving the moving armature (28) to approach the U-shaped magnetic yoke (22). The transmission assembly transforms the longitudinal movement of the moving armature (28) into the translational movement of the moving grid plate (24) away from the stationary grid plate (21). The self-cleaning mechanism (3) is located on the moving grid plate (24). The self-cleaning mechanism (3) includes a thermal expansion triggering component and a limiting block (32). The transmission component includes a movable piece (29) fixedly connected to the moving armature (28). The movable piece (29) contacts the moving grid plate (24). The limiting block (32) extends to the outside of the moving grid plate (24) and blocks the movable piece (29) on the side facing away from the U-shaped magnetic yoke (22). The thermal expansion triggering component includes a heated contact (34) and a spring expansion bladder (33). The spring expansion bladder (33) is located on the side of the limiting block (32). The heated contact (34) is used to sense the heat accumulation state caused by the accumulation of conductive microfilm in the arc extinguishing chamber (15) and conduct the heat to the spring expansion bladder (33). When the spring expansion bladder (33) expands sufficiently due to heat, it pushes the limiting block (32) back into the moving grid plate (24) to release the stop limit on the moving plate (29) and extend the moving stroke of the moving plate (29). During the longitudinal movement, the moving plate (29) scrapes and cleans the surface of the moving grid plate (24).

2. The circuit breaker with onboard connection according to claim 1, characterized in that, The housing (1) is provided with a switch (11), a connecting rod assembly (12), an electromagnet (13), a moving contact (14), and an arc-extinguishing chamber (15). The switch (11) controls the moving contact (14) through the connecting rod assembly (12). The electromagnet (13) is located above the moving contact (14). The operation of the electromagnet (13) causes the moving contact (14) to move. An arc-extinguishing chamber (15) is provided at the end of the moving contact (14). The arc-extinguishing chamber (15) extinguishes the arc generated when the moving contact (14) separates from the stationary contact.

3. A circuit breaker with onboard connection according to claim 1, characterized in that, The sliding connector (27) includes a guide rail (25) disposed in the arc-extinguishing chamber (15). The guide rail (25) has a stationary grid plate (21) and several movable grid plates (24). Arc extinguishing is achieved through the cooperation of the stationary grid plate (21) and the movable grid plates (24). The movable grid plates (24) are slidably connected to the guide rail (25). Movable plates (29) are disposed between adjacent grid plates. A movable armature (28) is disposed above the movable plates (29). A U-shaped magnetic yoke (22) is provided above the moving armature (28). The moving armature (28) and the U-shaped magnetic yoke (22) are connected by a return spring assembly (26). The moving plate (29) and the moving armature (28) are connected by a sliding connector (27). Several U-shaped magnetic yokes (22) are fixed in position by connecting plates (23). A connecting guide rail is provided on the moving grid plate (24). The moving armature (28), the return spring assembly (26) and the U-shaped magnetic yoke (22) constitute a magnetic adsorption component.

4. A circuit breaker with onboard connection according to claim 3, characterized in that, The connecting guide rail is divided into upper and lower parts by the center line point, with the upper part being an inclined plane and the lower part being a vertical plane.

5. A circuit breaker with onboard connection according to claim 3, characterized in that, The movable piece (29) is made of a high-temperature resistant magnetic transparent medium, and the two ends are set with arc surfaces to abut the sidewalls of the grid.

6. A circuit breaker with onboard connection according to claim 3, characterized in that, The surface of the grid plate has several protrusions, and the bottom of the grid plate is provided with a dust accumulation groove (31).

7. A circuit breaker with onboard connection according to claim 1, characterized in that, The self-cleaning mechanism (3) includes a limiting block (32), which is connected to the heated contact (34) through a spring expansion bladder (33). The lower surface of the limiting block (32) is an arc surface, and the upper surface is a plane.

8. A circuit breaker with onboard connection according to claim 7, characterized in that, The spring expansion bladder (33) is filled with a heat-expanding material, and the heat-conducting contact (34) is made of a heat-conducting material and penetrates the grid plate and is flush with the surface of the grid plate.

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