A high-capacity direct current circuit breaker with improved arc extinguishing structure

Abstract

The utility model relates to a large-capacity direct current circuit breaker with improved arc extinguishing structure belongs to circuit breaker field, for solving the arc extinguishing structure of marine direct current circuit breaker generally adopts copper arc extinguishing grid, relies on many piece grid step by step cutting, cooling, lengthens direct current arc, promotes arc voltage to realize the reliable extinguishing of no zero point direct current arc, but copper material is in high temperature environment above 200 DEG C yield strength attenuation, 300~400 DEG C working condition will enter obvious softening state, mechanical rigidity drops, and extremely easy to produce irreversible plastic deformation problem under external load effect, a kind of magnetic blow arc extinguishing type direct current circuit breaker, including circuit breaker shell, fixedly connected in the circuit breaker shell inside circuit breaker main body, the contact that is set in the circuit breaker main body, after the second grid and the first grid complete interactive nesting, the bending load brought by vibration is offset in advance by establishing reverse pre-stress, so as to reach the effect of reducing the one-way plastic deformation trend of grid piece, guaranteeing subsequent arc extinguishing effect.

Description

Technical Field

[0001] This invention relates to the field of circuit breakers, and in particular to a high-capacity DC circuit breaker with an improved arc-extinguishing structure. Background Technology

[0002] High-capacity DC circuit breakers are core protection devices for ship electric propulsion, energy storage and distribution, and power protection systems, playing a crucial role in short-circuit fault interruption and line overload protection. Compared to conventional DC power distribution scenarios on land, shipboard operations at sea are characterized by extreme features such as a fully enclosed cabin environment, continuous vibration, high salt spray, and long-term continuous operation, which place more stringent requirements on the stability and durability of the circuit breaker's arc-extinguishing structure.

[0003] To meet the safety standards for watertightness, explosion-proof, salt spray corrosion resistance, and explosion-proof in ship engine rooms, marine high-capacity DC circuit breakers must adopt a nearly completely sealed encapsulation structure. The arc-extinguishing chamber is an entirely closed cavity design, unable to form convection ventilation with the outside air, and lacks active heat dissipation and external ventilation. Compared to small and medium-capacity DC circuit breakers, high-capacity circuit breakers carry a larger rated current, have a higher total heat generation of the conductive circuit cross-section, and release energy from the arc during fault short-circuit interruption by several times. During long-term operation under load, the Joule heating of the conductive circuit and the residual heat from the arc generated by frequent interruptions cannot be dissipated in time. The heat continuously accumulates in the sealed arc-extinguishing chamber, causing the interior of the arc-extinguishing chamber to be in a steady-state high-temperature environment of 220-400℃ for a long time, forming a continuous high-temperature heat storage condition that land-based circuit breakers do not possess.

[0004] Currently, marine DC circuit breakers generally use copper arc-extinguishing grids in their arc-extinguishing structures. These grids progressively cut, cool, and lengthen the DC arc, increasing the arc voltage to achieve reliable extinction of the DC arc without zero-crossing. However, copper's yield strength decreases at temperatures above 200°C, and it softens significantly at 300–400°C, resulting in reduced mechanical rigidity and making it highly susceptible to irreversible plastic deformation under external loads.

[0005] During ship navigation, the rise and fall of waves, the rolling and heeling of the hull, and the continuous vibration of the main engine create all-weather, multi-dimensional composite alternating vibration loads, and the vibration intensity changes dynamically with sea conditions and is unavoidable. When the hull's turbulence vibration reaches a certain intensity threshold, the copper grid, which is in a state of high temperature softening, cannot maintain its original straight structure and assembly gaps, and will gradually undergo deformations such as unilateral bending, wave warping, and overall displacement.

[0006] Grid deformation directly disrupts the pre-designed uniform grid structure and regular arc channel of the arc-extinguishing chamber, leading to uneven arc cutting amount among grid plates, insufficient arc voltage boost, and slow recovery of the post-arc insulation medium. This greatly increases the risk of arc reignition, prolonged arcing time, and short-circuit disconnection failures, and in severe cases, can cause major safety accidents such as engine room arc fires and power outages in the propulsion system. Existing conventional arc-extinguishing grid structures are only suitable for static, ventilated, and heat-dissipating conditions on land. They lack protective and corrective structures designed for the coupled harsh conditions of ships, such as enclosed heat storage, high-temperature softening, and continuous vibration. As a result, they have poor reliability and a high risk of failure during long-term operation at sea, and cannot meet the long-term maintenance-free and highly reliable operation requirements of ships. Summary of the Invention

[0007] The purpose of this invention is to provide a high-capacity DC circuit breaker with an improved arc-extinguishing structure. This solves the problem of the commonly used copper arc-extinguishing grid in marine DC circuit breakers, which relies on multiple grids to progressively cut, cool, and lengthen the DC arc, thereby increasing the arc voltage to achieve reliable extinction of the DC arc without zero-crossing points. However, copper's yield strength decreases at temperatures above 200°C, and it softens significantly at 300–400°C, resulting in reduced mechanical rigidity and making it highly susceptible to irreversible plastic deformation under external loads.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a high-capacity DC circuit breaker with an improved arc-extinguishing structure, comprising a circuit breaker housing, a circuit breaker body fixedly connected inside the circuit breaker housing, contacts disposed inside the circuit breaker body, first magnets disposed on both sides of the contacts, an arc-extinguishing housing disposed on the side of the first magnet away from the contacts, a first grid fixedly connected to the inner side of the arc-extinguishing housing, and a second magnet disposed on the side of the first grid away from the contacts. A sliding cover is disposed on the outer side of the first grid. A first groove is formed on the side of the arc-extinguishing housing near the circuit breaker body. A first spring is fixedly connected to the inner side of the first groove. A baffle is fixedly connected to one end of the first spring. A pushing mechanism is disposed on the outer side of the baffle. An elastic mechanism is disposed between the pushing mechanism and the sliding cover.

[0009] The propulsion mechanism is used to drive the second grid to stagger with the first grid when the ship's vibration reaches a set impact intensity in order to clear impurities; the sliding cover is used to continue moving after the second grid and the first grid are nested together, to wrap the grid and pressurize the internal air, and to establish reverse prestress to counteract the vibration bending load.

[0010] Preferably, the width of the sliding cover is the same as the width of the baffle, the outer side of the baffle fits against the inner side of the first groove, and the outer side of the baffle and the outer side of the sliding cover are on the same plane.

[0011] Preferably, the arc-extinguishing housing has a first hole at the end away from the circuit breaker body, and the pushing mechanism includes a push rod disposed inside the first hole, a counterweight block fixedly connected to one end of the push rod, a fourth spring disposed outside the push rod and fixedly connected to the counterweight block, a push plate fixedly connected to the push rod at one end of the arc-extinguishing housing, a guide groove disposed inside the push plate, a push rod disposed on one side of the push plate, and a second groove disposed at the end of the arc-extinguishing housing away from the arc-extinguishing housing for placing the push rod;

[0012] A guide rod is provided on the inner side of the guide groove and is fixedly connected to the push rod.

[0013] Preferably, the push rod is a cuboid, and the outer side of the push rod fits against the inner side of the first hole.

[0014] Preferably, the guide groove is an inclined straight line and is clearance-fitted with the guide rod.

[0015] Preferably, the elastic mechanism includes a fixed plate fixedly connected to the outside of the push rod, a second spring fixedly connected to the fixed plate near the sliding cover, a second hole opened in the middle of the sliding cover for nesting the push rod, a third spring fixedly connected to the inside of the guide groove, a connecting plate fixedly connected to the end of the push rod near the circuit breaker body, a second grid provided on the connecting plate near the first grid, and a sleeve nested in the upper end of the push rod and slidably connected to the inside of the second groove;

[0016] The second spring is fixedly connected to the sliding cover, and the outer side of the push rod is in contact with the inner side of the second hole.

[0017] Preferably, there are multiple second grids distributed along the arrangement direction of the first grids, and the width of the second grid is the same as the spacing of the first grids, and the width of the first grid is the same as the spacing of the second grids.

[0018] Preferably, when the second spring is in its natural state, the side of the sliding cover closer to the circuit breaker body is further away from the circuit breaker body than the side of the connecting plate further away from the circuit breaker body.

[0019] Preferably, the inner depth of the sliding cover is greater than the sum of the depth of the second grid and the depth of the first grid.

[0020] Preferably, in the state of interactive nesting, the edges of the two grid layers are partially attached, dividing the through cavity into several independent layers to reduce the gas compressibility margin and stabilize the correction pressure.

[0021] Preferably, the inner depth of the sliding cover is greater than the sum of the depth of the second grid and the depth of the first grid.

[0022] 1. Compared with the prior art, the beneficial effects of the present invention are as follows: When the ship's swaying reaches a set impact intensity, the counterweight drives the push rod and push plate to move, which in turn drives the guide rod and push rod to offset the second grid from the first grid, cleaning down the sea salt particles and carbon particles accumulated on the inner side of the grid. During the descent of the connecting plate, compressed gas pushes the cleaned impurities to both sides. This achieves the effect of first cleaning and removing impurities, providing a clean grid surface for subsequent positive pressure correction.

[0023] 2. In this invention, after the second and first grids are nested together, the sliding cover continues to move towards the circuit breaker body, completely enclosing the second and first grids and pressurizing the internal air. This applies directional constraint pressure to both sides of the grids, establishing reverse prestress in advance to counteract the bending load caused by vibration. This achieves the effect of reducing the tendency of unidirectional plastic deformation of the grid plates and ensuring the subsequent arc extinguishing effect.

[0024] 3. This invention utilizes the ship's vibration itself for both cleaning impurities and straightening reinforcement, requiring no additional energy input. Furthermore, the cleaning and straightening actions are completed almost simultaneously during vibration, avoiding metal fatigue caused by pre-bending the grid before straightening. This achieves energy savings and extends the grid's lifespan.

[0025] 4. This invention employs a sequential logic of first cleaning and removing impurities, followed by positive pressure correction. Before applying positive pressure, all hard deposits on the inner sides of the first and second grids are thoroughly removed, ensuring that the positive pressure is applied evenly across the entire inner wall of the grid. This prevents impurities from being pressed into the softened copper grid, creating localized high-pressure stress zones. This effectively prevents the grid from warping or bending on one side during high-temperature softening, maintaining a straight state.

[0026] 5. During vibration-triggered correction, the first and second grids are nested and interleaved, with the edges of the two grid layers partially touching. This divides the large, continuous cavity into several small, independent layers, reducing the compressibility margin of the gas while maintaining the high correction pressure, thus mitigating pressure fluctuations caused by vibration. This achieves a continuous, uniform, and stable constraint pressure, effectively suppressing the irreversible metal fatigue of the grid plate under high-temperature softening conditions. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the external structure of the circuit breaker body of the present invention;

[0029] Figure 3 This is a schematic diagram of the left-side cross-sectional structure of the arc-extinguishing shell of the present invention;

[0030] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle;

[0031] Figure 5 For the present invention Figure 3 Schematic diagram of the structure at point B;

[0032] Figure 6 This is a top view cross-sectional structural diagram of the second groove of the present invention;

[0033] Figure 7 This is a bottom view schematic diagram of the first and second grid structures of the present invention;

[0034] Figure 8 This is a schematic diagram of the first groove structure of the present invention;

[0035] Figure 9 This is a schematic diagram of the left cross-section of the sliding cover structure of the present invention.

[0036] In the diagram: 1. Circuit breaker housing; 2. Circuit breaker body; 3. Contact; 4. First magnet; 5. Arc extinguishing housing; 6. First grid; 7. Sliding cover; 8. First groove; 9. First spring; 10. Pushing mechanism; 11. Elastic mechanism; 12. First hole; 101. Push rod; 102. Counterweight; 103. Fourth spring; 104. Push plate; 105. Guide groove; 1011. Push rod; 106. Second groove; 107. Guide rod; 108. Fixing plate; 109. Second spring; 1010. Second hole; 111. Third spring; 112. Connecting plate; 113. Second grid; 114. Sleeve; 13. Baffle. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-9The present invention provides the following: This structure is applied to a large-capacity DC circuit breaker with an improved arc-extinguishing structure. The whole includes a circuit breaker housing, a circuit breaker body (2), a contact (3), a first magnet (4), an arc-extinguishing housing (5), a first grid (6) fixed inside the arc-extinguishing housing (5), a second magnet (18) located on the side of the first grid (6) away from the contact (3), a sliding cover (7), a pushing mechanism (10), and an elastic mechanism (11). The arc-extinguishing housing (5) has a first groove (8) on the side near the circuit breaker body (2). A first spring (9) is fixedly connected inside the first groove (8). A baffle (13) is fixedly connected to one end of the first spring (9). The pushing mechanism (10) is connected to the outside of the baffle (13). An elastic mechanism (11) is assembled between the pushing mechanism (10) and the sliding cover (7) to realize the integrated functions of vibration adaptive triggering, automatic cleaning, air pressure stabilization, and reverse prestressing anti-deformation correction. The width of the sliding cover (7) is the same as the width of the baffle (13). The outer side of the baffle (13) fits against the inner side of the first groove (8), and the outer side of the baffle (13) and the outer side of the sliding cover (7) are on the same plane, ensuring that the structure fits neatly, without jamming, and does not affect the conventional arc extinguishing gas path.

[0039] Currently, marine DC circuit breakers generally employ copper arc-extinguishing grids. These grids progressively cut, cool, and lengthen the DC arc, increasing the arc voltage and achieving reliable extinction of the DC arc without zero-crossing. However, copper's yield strength decreases at temperatures above 200°C, and it softens significantly under the long-term operating conditions of 300–400°C, resulting in reduced mechanical rigidity. During ship navigation, continuous turbulence, vibration, and swaying can easily cause irreversible plastic deformation of the softened copper grids, such as unilateral bending and wave warping. This leads to disordered grid spacing, distortion of the arc-extinguishing channel, and ultimately, arc-extinguishing failure and circuit breaker burnout.

[0040] When the ship shakes and the vibration impact force reaches the preset trigger intensity, the inertia drives the counterweight (102) to move upward. The counterweight (102) is fixedly connected to one end of the push rod (101), which is located inside the first hole (12) at the end of the arc extinguishing housing (5) away from the circuit breaker body (2). The fourth spring (103) is located outside the push rod (101) and fixedly connected to the counterweight (102). It is used to set the vibration trigger threshold, filter out the slight normal shaking of the ship, and ensure that only strong vibrations and strong shaking impacts that reach the dangerous level will activate the push rod (101) correction mechanism, so as to avoid frequent malfunctions that interfere with the normal arc extinguishing operation. The push rod (101) has a cuboid structure, and its outer side is completely in contact with the inner side of the first hole (12), ensuring that the push rod moves smoothly, without deviation or shaking.

[0041] The counterweight (102) is driven by vibration inertia to move the push rod (101) upward, which in turn drives the push plate (104) and the second spring (109) to move laterally in linkage. At the same time, it drives the guide rod (107), the push rod (1011) and the sliding cover (7) nested on the outside of the push rod (1011) to move upward, and finally drives the connecting plate (112) and the second grid (113) to move upward as a whole. Until the upper end of the connecting plate (112) contacts and limits the contact with the inner side of the arc extinguishing shell (5), the second grid (113) and the first grid (6) are instantly completely misaligned, providing structural stroke for subsequent mechanical scraping of impurities.

[0042] After the misalignment is completed, the push plate (104) continues to move upward due to its own inertia, while the guide rod (107) has reached its limit and no longer moves upward, causing the push plate (104) to passively overcome the elastic force of the third spring (111) and continue to slide. An inclined straight guide groove (105) is provided on the inner side of the push plate (104). The guide groove (105) and the guide rod (107) are in clearance fit, and the movement is smooth and without jamming. The continuous displacement of the push plate (104) causes the inclined guide groove (105) to shift laterally, squeezing and pushing the guide rod (107) and the push rod (1011) to move laterally towards the circuit breaker body (2) along the guide direction of the sleeve (114), thereby driving the connecting plate (112) and the second grid (113) to slide towards the circuit breaker body (2) as a whole.

[0043] Multiple second grids (113) are densely distributed along the direction of the first grid (6), and the width of a single second grid (113) is completely matched with the spacing between the first grids (6), and the width of a single first grid (6) is also consistent with the spacing between the second grids (113), forming an interlaced pairing structure. During the lateral sliding of the second grid (113), through the grid plate misalignment, interpenetration, and scraping action, hard impurities such as sea salt crystal particles, arc combustion carbon particles, and copper shavings carbon deposits accumulated on the inner side of the first grid (6) and the second grid (113) can be thoroughly scraped and peeled off. During the subsequent repositioning process of the connecting plate (112), the internal space of the arc extinguishing chamber is passively compressed, forming an instantaneous lateral airflow, which quickly blows the loose impurities scraped off to both sides of the grid and thoroughly clears the hard deposits inside the grid gaps, providing a clean, non-protruding, and impurity-free grid surface for subsequent positive pressure correction, and avoiding stress concentration during the correction process.

[0044] The elastic mechanism (11) is composed of a fixed plate (108), a second spring (109), a third spring (111), a sleeve (114), and a second hole (1010). The fixed plate (108) is fixed to the outside of the push rod (1011). The fixed plate (108) is fixedly connected to the sliding cover (7) through the second spring (109). The outside of the push rod (1011) slides in contact with the second hole (1010) on the inside of the sliding cover (7) to ensure the coaxiality and stability of the sliding cover displacement. When the second spring (109) is in its natural state, the sliding cover (7) is closer to the side of the circuit breaker body (2), which is further outward than the side of the connecting plate (112) that is further away from the circuit breaker body (2). This ensures that when the circuit breaker is working normally and there is no severe vibration, the sliding cover (7) will not intrude into the arc extinguishing area or block the arc channel. It will not affect the normal entry of the arc into the grid for cutting, cooling and extinguishing the arc, and ensure that the normal arc extinguishing performance of the equipment is not affected by the mechanism.

[0045] After the second grid (113) and the first grid (6) complete the interactive nesting and misalignment cleaning actions, the sliding cover (7) continues to slide towards the circuit breaker body (2) by inertia. The inner depth of the sliding cover (7) is greater than the sum of the depths of the second grid (113) and the first grid (6), so that the sliding cover (7) can completely and fully wrap the two grid structures during the sliding process. As the sliding cover (7) continues to advance, it forcibly compresses the sealed air inside the cover, forming a uniform sealed high-pressure air cavity around the arc-extinguishing grid, and simultaneously applies directional and uniform constraint pressure to both sides of the second grid (113) and the first grid (6), thus establishing a reverse prestress field in advance. When the ship vibration attempts to cause the high-temperature softened grid to produce an inward or outward bending moment, the uniform air pressure support force on the periphery can counteract the vibration load in the opposite direction, fundamentally suppressing the unidirectional displacement, plastic bending, and wave warping of the grid, stabilizing the grid shape, and ensuring that the subsequent arc-extinguishing grid gaps are uniform and the arc-extinguishing effect is stable.

[0046] This innovative structure employs a sequential working logic of first cleaning and removing impurities, followed by positive pressure correction, completely resolving the reverse degradation defects of traditional synchronous correction structures. If impurities are not thoroughly cleaned beforehand, residual copper shavings, arc carbon deposits, and salt spray hardening deposits inside the arc-extinguishing chamber will firmly adhere to the high-temperature grid wall. During positive pressure correction at a softened copper temperature of 300–400°C, hard impurities are directly squeezed and trapped between the pressure structure and the softened grid wall. The softened copper grid cannot rigidly resist locally protruding impurities, and the positive pressure cannot be evenly distributed across the entire area, instead concentrating on the protruding points of impurities, forming localized high-pressure stress zones. During continuous pressure holding, hard impurities are directly pressed into the interior of the softened copper grid, forming dotted and strip-shaped depressions, while unpressurized areas remain relatively convex, ultimately causing a reverse degradation problem where the more it is corrected, the more severe the deformation, completely destroying the grid's straightness and slot uniformity. Before applying the correction pressure, this device thoroughly removes all hard deposits by alternating scraping of the grid plates and blowing with airflow, so that the subsequent positive pressure can be applied evenly to the entire grid wall surface, without stress concentration or local indentation, achieving high-temperature softened grid flat and damage-free correction.

[0047] The corrective driving force of this device comes entirely from the ship's own vibration inertia. It requires no external power supply or additional driving components, operates passively and adaptively, is energy-efficient and reliable, and is suitable for the complex power distribution environment of ships. At the same time, vibration disturbance, grid deformation trend, and cleaning and correction actions are completed almost instantaneously, without the lag process of grid bending first and then correction. This can minimize the accumulation of metal fatigue caused by long-term deformation and springback of the grid, and improve the fatigue life and long-term structural stability of the high-temperature softened copper grid.

[0048] To address the issues of compressible gas and fluctuating air pressure during high-pressure correction, this structure utilizes a staggered nested grid configuration to achieve stable pressure correction. When the ship vibrates and the sliding cover compresses air to establish the high-pressure correction, the first grid (6) and the second grid (113) are nested and staggered, with the edges of the two grid layers partially touching. This divides the originally continuous large-volume cavity into multiple small, independent, or interconnected sealed interlayer air chambers. Under the premise of unchanged correction pressure, this reduces the compressibility margin of the internal gas, effectively weakening the air pressure fluctuations caused by ship turbulence and vibration. This allows the grid sides to obtain continuous, uniform, and stable constraint pressure, suppressing the irreversible plastic deformation of the grid plate and the generation and accumulation of metal fatigue under high-temperature softening conditions, and ensuring the high-capacity, high-reliability arc-extinguishing performance of the marine DC circuit breaker in the long term.

[0049] The term "comprising" is used to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between those entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-capacity DC circuit breaker with an improved arc-extinguishing structure, comprising a circuit breaker housing (1), a circuit breaker body (2) fixedly connected inside the circuit breaker housing (1), contacts (3) disposed inside the circuit breaker body (2), first magnets (4) disposed on both sides of the contacts (3), an arc-extinguishing housing (5) disposed on the side of the first magnets (4) away from the contacts (3), a first grid (6) fixedly connected to the inner side of the arc-extinguishing housing (5), and a second magnet (18) disposed on the side of the first grid (6) away from the contacts (3), characterized in that, A sliding cover (7) is provided on the outer side of the first grid (6). A first groove (8) is provided on the side of the arc extinguishing shell (5) near the circuit breaker body (2). A first spring (9) is fixedly connected to the inner side of the first groove (8). A baffle (13) is fixedly connected to one end of the first spring (9). A pushing mechanism (10) is provided on the outer side of the baffle (13). An elastic mechanism (11) is provided between the pushing mechanism (10) and the sliding cover (7). The pushing mechanism (10) is used to drive the second grid (113) and the first grid (6) to be staggered when the ship vibration reaches the set impact intensity in order to clean up impurities; the sliding cover (7) is used to continue to move after the second grid (113) and the first grid (6) are nested together, to wrap the grid and pressurize the internal air, and to establish reverse prestress to counteract the vibration bending load.

2. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 1, characterized in that, The width of the sliding cover (7) is the same as the width of the baffle (13). The outer side of the baffle (13) fits against the inner side of the first groove (8), and the outer side of the baffle (13) and the outer side of the sliding cover (7) are on the same plane.

3. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 1, characterized in that, The arc-extinguishing housing (5) has a first hole (12) at the end away from the circuit breaker body (2). The pushing mechanism (10) includes a push rod (101) disposed inside the first hole (12), a counterweight (102) fixedly connected to one end of the push rod (101), a fourth spring (103) disposed outside the push rod (101) and fixedly connected to the counterweight (102), a push plate (104) fixedly connected to the push rod (101) at one end of the arc-extinguishing housing (5), a guide groove (105) opened inside the push plate (104), a push rod (1011) disposed on one side of the push plate (104), and a second groove (106) opened at the end of the arc-extinguishing housing (5) away from the arc-extinguishing housing (5) for placing the push rod (1011). The inner side of the guide groove (105) is provided with a guide rod (107) that is fixedly connected to the push rod (1011).

4. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 3, characterized in that, The push rod (101) is a cuboid, and the outer side of the push rod (101) is in contact with the inner side of the first hole (12).

5. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 3, characterized in that, The guide groove (105) is an inclined straight line and is clearance-fitted with the guide rod (107).

6. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 3, characterized in that, The elastic mechanism (11) includes a fixed plate (108) fixedly connected to the outside of the push rod (1011), a second spring (109) fixedly connected to the side of the fixed plate (108) near the sliding cover (7), a second hole (1010) opened in the middle of the sliding cover (7) and used to nest the push rod (1011), a third spring (111) fixedly connected to the inside of the guide groove (105), a connecting plate (112) fixedly connected to the end of the push rod (1011) near the circuit breaker body (2), a second grid (113) set on the side of the connecting plate (112) near the first grid (6), and a sleeve (114) nested in the upper end of the push rod (1011) and slidably connected to the inside of the second groove (106). The second spring (109) is fixedly connected to the sliding cover (7), and the outer side of the push rod (1011) is in contact with the inner side of the second hole (1010).

7. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 6, characterized in that, The second grid (113) has multiple grids arranged along the direction of the first grid (6), and the width of the second grid (113) is consistent with the spacing of the first grid (6), and the width of the first grid (6) is consistent with the spacing of the second grid (113).

8. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 6, characterized in that, When the second spring (109) is in its natural state, the side of the sliding cover (7) closer to the circuit breaker body (2) is further away from the circuit breaker body (2) than the side of the connecting plate (112) further away from the circuit breaker body (2).

9. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 1, characterized in that, The inner depth of the sliding cover (7) is greater than the sum of the depth of the second grid (113) and the depth of the first grid (6).

10. A high-capacity DC circuit breaker with an improved arc-extinguishing structure according to claim 1, characterized in that, In the interactive nested state, the edges of the two grids (6) are partially attached, dividing the through cavity into several independent interlayers to reduce the compressibility margin of the gas and stabilize the correction pressure.

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