Molded case circuit breaker

Abstract

The utility model discloses a molded case circuit breaker, which relates to the technical field of circuit breakers and comprises a base, a rotating shaft, a traction rod and a partition plate assembly. The base is provided with an interphase partition wall which is provided with a first supporting seat. The rotating shaft is rotationally installed on the first supporting base and stretches across the two adjacent phases. The draw bar is rotatably mounted on the base and crosses two adjacent phases. The partition plate assembly comprises an integrated flash barrier and an assembly part, the flash barrier is blocked between the arc extinguish chamber and the rotating shaft, the assembly part is provided with a partition plate, the partition plate is provided with a first profiling groove, and the first profiling groove is provided with a first plug-in structure. The partition plates abut against the interphase partition walls correspondingly, the profiling grooves and the first supporting bases are matched to wrap the rotating shaft, the rotating shaft is provided with a second plug-in structure, and the second plug-in structure is connected with the first plug-in structure in an inserted mode. The partition plate is further provided with a second supporting seat, the second supporting seat is provided with a second profiling groove, and the traction rod is rotationally installed in the second profiling groove. According to the molded case circuit breaker provided by the invention, the influence of pollutants on the interphase insulation performance can be reduced.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, specifically to a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers can automatically cut off the current when the current exceeds the trip setting. During the current cutting process, a strong electric arc is generated, accompanied by high temperature, high pressure gas, and contaminants such as carbon powder and metal particles. These contaminants will spread with the airflow and are easy to spread to the interphase area, resulting in a decrease in interphase insulation performance.

[0003] Existing molded case circuit breakers typically use partitions between each phase to limit the spread of electric arc and contaminants. However, due to unreasonable structure and errors in the assembly process, existing partitions are prone to poor protection and affect the stability of phase-to-phase insulation performance.

[0004] Therefore, there is an urgent need to propose a molded case circuit breaker to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this application is to provide a molded case circuit breaker that can reduce the impact of contaminants on phase-to-phase insulation performance.

[0006] This application provides a molded case circuit breaker, including a base, a rotating shaft, a traction rod, and a partition assembly. The base has at least one phase partition wall, and the phase partition wall has a first support seat. The rotating shaft is rotatably mounted on the first support seat, and the rotating shaft spans two adjacent phases.

[0007] The traction rod is rotatably mounted on the base and spans two adjacent phases. The baffle assembly includes an integrally formed arc-damping plate and an assembly part. The arc-damping plate blocks the arc-extinguishing chamber and the rotating shaft. The assembly part is provided with a partition plate, and the partition plate is provided with a first contour groove. The bottom of the first contour groove is provided with a first interlocking structure.

[0008] The partition plate abuts against the adjacent partition wall. The contoured groove and the first support seat cooperate to wrap around the rotating shaft. The rotating shaft has a second mating structure, which is inserted into the first mating structure. The partition plate also has a second support seat, which has a second contoured groove. The traction rod is rotatably installed in the second contoured groove.

[0009] The baffle assembly can work in conjunction with the base to block part of the arc and contaminants from spreading from the arc-extinguishing chamber, thereby reducing the risk of molded case circuit breaker failure due to arc and contaminant spread. Simultaneously, the baffle plates on the assembly can precisely align with the phase partition walls and the rotating shafts mounted on them, improving the protection of the rotating shafts at the assembly point. Furthermore, the baffle plates can precisely align with the traction rods, enhancing their protection at the assembly point. This configuration effectively solves the problem of low phase-to-phase insulation performance caused by assembly gaps between the rotating shafts and traction rods, thus improving the reliability of the molded case circuit breaker.

[0010] In some examples, the first mating structure is configured as a mating slot and the second mating structure is configured as a flange, or the first mating structure is configured as an arc-shaped boss and the second mating structure is configured as a mating slot.

[0011] This type of assembly is characterized by its simple structure and convenient assembly. It also helps to increase the creepage distance and acts as a barrier, reducing the possibility of electric arc and contaminants spreading from the assembly gap to the adjacent phase.

[0012] In some examples, the bottom of the second contour groove is provided with a third pair of interlocking structures, and the traction rod is provided with a fourth pair of interlocking structures. The third pair of interlocking structures and the fourth pair of interlocking structures are interlocked to form a dynamic sealing fit.

[0013] By setting the third and fourth interlocking structures, an interlocking fit can be formed between the traction rod and the second contour groove, thereby forming a dynamic sealing structure at the assembly point of the second support and the traction rod, effectively preventing electric arcs and contaminants from entering the interphase area.

[0014] In some examples, the assembly section is also provided with an extension plate opposite to the arc-blocking plate. The extension plate has an air blow hole. The molded case circuit breaker also includes an electromagnetic trip unit, which includes a rotatably mounted armature. The airflow in the air blow hole can blow the armature to rotate.

[0015] This configuration not only accelerates the discharge of high-temperature, high-pressure gas from the arc-extinguishing chamber and the space where the shaft is located, but also guides contaminants to be discharged through the air blow-out holes via the airflow, reducing the risk of gas and contaminant diffusion into the interphase region. Simultaneously, the airflow from the air blow-out holes actuates the electromagnetic trip unit, enabling it to assist in rapid tripping, thereby reducing the generation of high-temperature, high-pressure gas and contaminants, further lowering the risk of interphase short circuits caused by gas and contaminant diffusion, and contributing to improved interphase insulation performance.

[0016] In some examples, the extension plate includes a continuous first drainage section and a second drainage section, an air blowing hole is disposed in the first drainage section, and the second drainage section has a preset included angle with the first drainage section.

[0017] The first drainage section forms an initial airflow channel through air blowing holes, while the second drainage section changes the airflow direction through an angled bend, achieving a better airflow organization effect. The preset angle causes the electric arc to form segmented stretching on the surface of the extension plate, accelerating arc cooling and extinguishing. The continuous arrangement of the two drainage sections ensures structural strength while optimizing the internal airflow field distribution through angle changes. The bend structure creates airflow disturbance, promoting particulate matter deposition in the second drainage section and reducing interphase contamination.

[0018] In some examples, the end of the second drainage section is provided with a buffer section that extends toward the armature.

[0019] The buffer section can change the guiding direction again based on the second guide section, which can further lengthen the arc that diffuses to the extension plate, reduce the reignition rate, and prevent the arc from directly burning the armature surface, which is conducive to maintaining the stability of the electromagnetic trip device.

[0020] In some examples, a protective plate is provided inside the base, located between the arc-extinguishing chamber and the rotating shaft. The arc-blocking plate and the protective plate partially overlap, and part of the arc-blocking plate extends away from the base.

[0021] The advantage of this design lies in its multi-layered protective arrangement, which significantly improves arc extinguishing efficiency and interphase insulation performance. The combination of the protective plate and the arc-blocking plate considers both structural strength requirements and optimizes the efficiency of internal airflow organization, confining the arc within the arc-extinguishing chamber and minimizing the diffusion of contaminants to the interphase region. This structure is particularly suitable for high-current breaking applications and can effectively withstand severe arc energy impacts.

[0022] In some examples, the arc-blocking plate has a clearance groove, and the molded case circuit breaker also includes a stationary contact and a moving contact. The stationary contact is fixedly installed in the arc-extinguishing chamber, and the moving contact is connected to the rotating shaft and extends into the arc-extinguishing chamber through the clearance groove.

[0023] This clearance groove structure has multiple functional characteristics. First, it provides precise guiding space for the movement of the moving contact, ensuring that the contact maintains the correct trajectory during opening and closing. Second, the contour shape of the clearance groove is optimized to ensure the freedom of movement of the moving contact while minimizing the leakage path of arc products. Furthermore, this structure allows for a more compact fit between the contact system and the arc-blocking plate, effectively utilizing the internal space of the circuit breaker.

[0024] In some examples, the molded case circuit breaker also includes an operating mechanism mounted on the assembly and located on the side of the partition assembly opposite to the shaft. Part of the operating mechanism passes through the assembly and is drive-connected to the shaft. A traction rod is hinged to the operating mechanism.

[0025] The operating mechanism is positioned and installed through the assembly section. The design of some components passing through the assembly section ensures both the directness of the transmission and the compactness of the structure. This reduces the diffusion of electric arcs, high-temperature and high-pressure gases, or contaminants to the operating mechanism, which is beneficial to maintaining the stability of the operating mechanism.

[0026] In some examples, the side of the partition assembly has an overlap that overlaps the outer wall of the base.

[0027] The overlapping part can form a simple closed structure with the side wall of the base, which can improve the installation stability of the partition assembly on the base, and reduce the possibility of electric arc, high temperature and high pressure gas and pollutants spreading out from the gap between the partition assembly and the side wall of the base. In conjunction with phase partition walls, partition plates, arc isolation plates and extension plates, it can effectively enhance the phase-to-phase insulation performance of the molded case circuit breaker. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the internal structure of a molded case circuit breaker provided in an embodiment of this application.

[0030] Figure 2 An exploded view of the molded case circuit breaker provided in the embodiments of this application.

[0031] Figure 3 This is a schematic diagram of the structure of the base provided in an embodiment of this application.

[0032] Figure 4 This is a schematic diagram of the structure in which the rotating shaft is installed in the base according to an embodiment of this application.

[0033] Figure 5 This is a schematic diagram of the assembly of the partition assembly and the traction rod provided in the embodiments of this application.

[0034] Figure 6 A first view of a partition assembly provided in an embodiment of this application.

[0035] Figure 7 Provided for the embodiments of this application Figure 1 Cross-sectional view at point AA.

[0036] Figure 8 This is a schematic diagram of the structure of the rotating shaft and partition assembly provided in the embodiment of this application.

[0037] Figure 9 A second view of the partition assembly provided in an embodiment of this application.

[0038] Figure 10 This is a schematic diagram of the cooperation structure between the partition assembly and the electromagnetic trip device provided in the embodiments of this application.

[0039] Figure 11 This is a schematic diagram of the mating structure of the partition assembly, base, and moving contact provided in an embodiment of this application.

[0040] Figure 12 This is a schematic diagram of the cooperation structure between the partition assembly, the operating mechanism, and the base provided in the embodiments of this application.

[0041] Explanation of reference numerals in the attached drawings: 1. Base; 11. Phase partition wall; 12. First support seat; 13. Arc extinguishing chamber; 14. Protective plate; 15. Threaded hole; 2. Rotating shaft; 21. Second interlocking structure; 3. Traction rod; 4. Partition assembly; 41. Arc blocking plate; 411. Clearance groove; 42. Assembly part; 421. Through hole; 43. Partition plate; 431. First contour groove; 432. First interlocking structure; 44. Second support seat; 441. Second contour groove; 45. Extension plate; 451. Air blowing hole; 452. First drainage part; 453. Second drainage part; 454. Buffer section; 46. Overlapping part; 5. Electromagnetic trip device; 51. Armature; 6. Operating mechanism; 61. Through hole; 7. Moving contact; 8. Stationary contact. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application 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 this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" 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 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 application according to the specific circumstances.

[0047] When a molded case circuit breaker breaks a circuit, it generates a high-temperature electric arc, accompanied by the ejection of contaminants such as metal vapor and carbonized particles. These conductive contaminants are easily diffused into the interphase area under the action of airflow, leading to a decrease in insulation performance and even causing interphase short circuits, seriously affecting the reliability of the molded case circuit breaker.

[0048] Existing technology limits the spread of conductive contaminants by installing baffles inside molded case circuit breakers. However, due to the large number of internal components in molded case circuit breakers, there are assembly gaps between adjacent phases, and existing baffles are not adequately protective, resulting in low safety of molded case circuit breakers.

[0049] Based on this, the present application provides a molded case circuit breaker that can reduce the impact of contaminants on phase-to-phase insulation performance.

[0050] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0051] Reference Figures 1 to 4 This embodiment provides a molded case circuit breaker, including a base 1, a rotating shaft 2, a traction rod 3, and a partition assembly 4. The base 1 is provided with at least one phase partition wall 11, and the phase partition wall 11 is provided with a first support seat 12. The rotating shaft 2 is rotatably mounted on the first support seat 12, and the rotating shaft 2 spans two adjacent phases.

[0052] The base 1 serves as the main body for supporting the rotating shaft 2, the traction rod 3, the partition assembly 4, and other components. The base 1 has a cavity for accommodating these components, and the phase partition wall 11 is located in the cavity. Molded case circuit breakers are generally available in single-phase, two-phase, or three-phase forms. In the two-phase and three-phase multi-phase forms, a phase partition wall 11 is provided. The phase partition wall 11 is used to separate two adjacent phases to avoid phase-to-phase short circuits between adjacent phases.

[0053] The first support seat 12 provided on the phase partition wall 11 is used to install and support the rotating shaft 2. The first support seat 12 is specifically an arc-shaped groove opened on the phase partition wall 11. The axis of the arc-shaped groove is perpendicular to the plane where the phase partition wall 11 is located. The rotating shaft 2 is rotatably installed in the arc-shaped groove and spans across two adjacent phases.

[0054] Reference Figure 5 and Figure 6 The baffle assembly 4 includes an integrally formed arc-blocking plate 41 and an assembly part 42, with the arc-blocking plate 41 blocking between the arc-extinguishing chamber 13 and the rotating shaft 2.

[0055] The integrated baffle assembly 4 has the advantages of structural stability and easy assembly. The arc-quenching plate 41 and the assembly part 42 are integrally formed. The assembly part 42 is used to realize the assembly on the base 1. After assembly, the arc-quenching plate 41 is located between the arc-extinguishing chamber 13 and the rotating shaft 2. The arc-extinguishing chamber 13 is used to extinguish the electric arc. The arc-quenching plate 41 can prevent the electric arc and contaminants from spreading from the arc-extinguishing chamber 13 to the rotating shaft 2, reducing the possibility of damage to the rotating shaft 2 caused by the electric arc, and the impact of contaminant accumulation on the rotating shaft 2 causing jamming or short circuit.

[0056] The assembly part 42 is provided with a partition plate 43, on which a first contour groove 431 is provided, and at the bottom of the first contour groove 431 a first interlocking structure 432 is provided. The partition plate 43 abuts against the adjacent partition wall 11, and the contour groove cooperates with the first support base 12 to wrap around the rotating shaft 2. The rotating shaft 2 is provided with a second interlocking structure 21, which is correspondingly inserted into the first interlocking structure 432.

[0057] Reference Figure 7 The partition plate 43 and the phase partition wall 11 are respectively abutted. In this embodiment, the partition plate 43 and the phase partition wall 11 are both plate-shaped structures. After the assembly part 42 is assembled, the partition plate 43 and the phase partition wall 11 are on the same plane. The bottom wall of the partition plate 43 abuts against the top wall of the phase partition wall 11. The partition plate 43 and the phase partition wall 11 cooperate to completely separate the two adjacent phases, further reducing the risk of electric arc and pollutants spreading to the adjacent phases and causing phase-to-phase short circuits, and improving the protection performance between the two adjacent phases.

[0058] The number and position of the partition plates 43 correspond one-to-one with the number and position of the phase partition walls 11. For example, in this embodiment, the molded case circuit breaker is three-phase, and there are two phase partition walls 11. The corresponding assembly part 42 is also provided with two partition plates 43.

[0059] Reference Figure 7 and Figure 8 The shape of the first contour groove 431 matches the cylindrical structure of the rotating shaft 2. With the cooperation of the first contour groove 431 and the first support seat 12, the position of the rotating shaft 2 can be restricted, and the protection effect of the assembly position of the rotating shaft 2 can be improved without affecting the rotation of the rotating shaft 2. This reduces the risk of electric arc and contaminants spreading from the position between two adjacent phases of the rotating shaft 2 to the adjacent phases, causing a phase-to-phase short circuit.

[0060] Furthermore, the arrangement of the first plug-in structure 432 and the second plug-in structure 21 can form a more robust protective structure between the rotating shaft 2 and the partition plate 43. For example, the flange on the rotating shaft 2 is inserted into the groove of the partition plate 43, so that even if an electric arc spreads into the gap between the rotating shaft 2 and the partition plate 43, it will be quickly extinguished due to the increased creepage distance, effectively reducing the possibility of phase-to-phase short circuit between adjacent phases.

[0061] Reference Figure 5 and Figure 6 The partition plate 43 is also provided with a second support base 44, which has a second contour groove 441. The traction rod 3 is rotatably mounted in the second contour groove 441. The traction rod 3 is rotatably mounted on the base 1 and spans two adjacent phases.

[0062] The second support seat 44 is used to support and install the traction rod 3. The traction rod 3 is rotatably installed in the second contour groove 441. The shape of the second contour groove 441 matches the shape of the traction rod 3. The traction rod 3 spans two adjacent phases on the second support seat 44, just like the rotating shaft 2 on the first support seat 12. The second support seat 44 can be set to maintain a tight fit with the installation position of the traction rod 3 between two adjacent phases, thereby preventing electric arc and contaminants from spreading from the assembly gap of the traction rod 3 to the adjacent phases, further improving the protection effect.

[0063] In practice, the molded case circuit breaker also includes a cover, which is usually provided with a third contour groove that mates with the second contour groove 441. The cooperation between the second contour groove 441 and the third contour groove can improve the tightness of the fit of the traction rod 3 at the second support seat 44, and reduce the risk of arc and contaminants spreading from the installation gap of the traction rod 3 to adjacent phases, causing phase-to-phase short circuits.

[0064] The partition assembly 4 can cooperate with the base 1 to block part of the arc and contaminants from spreading out of the arc-extinguishing chamber 13 using the arc-blocking plate 41, thereby reducing the risk of molded case circuit breaker failure caused by the spread of arc and contaminants. At the same time, the partition plate 43 on the partition assembly 4 can accurately cooperate with the phase partition wall 11 and the rotating shaft 2 installed on the phase partition wall 11 to improve the protection effect of the rotating shaft 2 at the assembly point. Furthermore, the partition plate 43 can also accurately cooperate with the traction rod 3 to improve the protection effect of the traction rod 3 at the assembly point. This configuration effectively solves the problem of low phase-to-phase insulation performance caused by the assembly gap between the rotating shaft 2 and the traction rod 3, which is conducive to improving the reliability of the molded case circuit breaker.

[0065] In the first configuration scheme, refer to Figure 7 and Figure 8 The first mating structure 432 is configured as a mating slot, and the second mating structure 21 is configured as a flange.

[0066] In this design, a mating groove is formed at the bottom of the first contour groove 431, and a flange is disposed on the surface of the rotating shaft 2. During assembly, the flange is aligned with the mating groove and inserted, at which point the bottom of the first contour groove 431 is close to or in contact with the surface of the rotating shaft 2. Specifically, the shape and size of the flange match the shape and size of the mating groove to form a tight mating fit without affecting the rotation of the rotating shaft 2. This helps to increase the creepage distance and acts as a barrier, reducing the possibility of arc and contaminants spreading from the assembly gap to adjacent phases.

[0067] In addition, the first support base 12 can also be provided with the same insertion groove as the first insertion structure 432, so that the flange on the rotating shaft 2 can simultaneously cooperate with the insertion groove on the first support base 12 and the insertion groove on the partition plate 43, which can further improve the protection effect.

[0068] In the second configuration (not shown in the figure), the first mating structure 432 is configured as an arc-shaped boss, and the second mating structure 21 is configured as a mating groove.

[0069] Similar to the aforementioned schemes, both are plug-in types, with simple structures and convenient assembly. They also help increase creepage distance and act as a barrier, reducing the possibility of arc and contaminants spreading from the assembly gap to adjacent phases. The difference is that the structures are reversed. The first plug-in structure 432 is set as an arc-shaped boss at the bottom of the first contour groove 431, and the curvature of the arc-shaped boss matches the curvature of the rotating shaft 2 surface. The second plug-in structure 21 is a plug groove set on the surface of the rotating shaft 2.

[0070] Both interlocking configurations achieve effective sealing and isolation, and the choice can be made based on the specific product structure and process requirements. In practical applications, the first configuration is more suitable for situations requiring rapid assembly, while the second configuration performs better in scenarios requiring higher rotational precision. Regardless of the configuration used, the mating clearance of the interlocking type should be controlled within a reasonable range to ensure both smooth relative movement and effective prevention of contaminant passage.

[0071] In some examples, the bottom of the second contour groove 441 is provided with a third pair of interlocking structures (not shown in the figure), and the traction rod 3 is provided with a fourth pair of interlocking structures (not shown in the figure). The third pair of interlocking structures and the fourth pair of interlocking structures are interlocked to form a dynamic sealing fit.

[0072] By setting the third and fourth interlocking structures, an interlocking relationship can be formed between the traction rod 3 and the second contour groove 441, thereby forming a dynamic sealing structure at the assembly point of the second support 44 and the traction rod 3, effectively preventing electric arc and contaminants from entering the interphase area.

[0073] The engagement of the third and fourth mating structures is the same as that of the first mating structure 432 and the second mating structure 21. Specifically, the third mating structure can be configured as a mating slot, and the fourth mating structure can be configured as a flange. The flange is inserted into the mating slot and maintains a movable engagement with the mating slot. This not only does not affect the normal rotation of the traction rod 3, but also increases the creepage distance and blocks contaminants at the assembly position of the traction rod 3 and the second support seat 44. This effectively prevents the arc and contaminants from spreading from the interphase area to adjacent phases, reducing the risk of interphase short circuits.

[0074] In another embodiment, the third mating structure can also be configured as an arc-shaped boss, and the fourth mating structure can be configured as a slot. This configuration has the same technical effect as the aforementioned configuration.

[0075] Reference Figure 9 and Figure 10 In some examples, the assembly part 42 is also provided with an extension plate 45, which is opposite to the arc-blocking plate 41, and an air blowing hole 451 is provided on the extension plate 45.

[0076] The extension plate 45 is disposed on the assembly part 42 at a position opposite to the arc-blocking plate 41, that is, the arc-blocking plate 41 is located at the first end of the assembly part 42, the extension plate 45 is located at the second end of the assembly part 42, and the rotating shaft 2 is located between the arc-blocking plate 41 and the extension plate 45.

[0077] Since a moving contact 7 is provided between the rotating shaft 2 and the arc-extinguishing chamber 13, and the moving contact 7 needs to pass through the arc-isolating plate 41, a channel is left between the arc-isolating plate 41 and the arc-extinguishing chamber 13. Some of the high-temperature and high-pressure gas and pollutants generated by the interrupting current will diffuse from the arc-extinguishing chamber 13 to the space between the arc-isolating plate 41 and the extension plate 45.

[0078] The air blow hole 451 on the extension plate 45 is used to interrupt the flow of high temperature and high pressure gas generated by the current, thereby facilitating the extinction of the electric arc and the flow of contaminants with the airflow, reducing the possibility of electric arc damage to the rotating shaft 2 and the possibility of contaminants accumulating on the rotating shaft 2.

[0079] The extension plate 45 is located on the opposite side of the arc-blocking plate 41 and can block the flow of air. After being blocked by the extension plate 45, the air will gather and flow out from the air blowing hole 451, which can accelerate the airflow speed, thereby helping to reduce the temperature of the airflow, extinguish the electric arc, and allow pollutants to flow out with the airflow.

[0080] Specifically, the size and structure of the air blowing hole 451 are not limited here, and shall be subject to the actual situation. For example, the shape of the air blowing hole 451 can be circular, and the size of the air blowing hole 451 can be designed to be small, so as to accelerate the flow rate as much as possible while ensuring that the pollutants can flow out with the airflow. Of course, it is not limited to this in practice.

[0081] Meanwhile, the number of air blowing holes 451 can be multiple to reduce the possibility of high-temperature and high-pressure gas accumulating at the rotating shaft 2. For example, the number of air blowing holes 451 can be two, three, or more, without specific limitation, and subject to actual conditions.

[0082] Reference Figure 9 and Figure 10 The molded case circuit breaker also includes an electromagnetic trip unit 5, which includes a rotatably mounted armature 51. The airflow in the air blow hole 451 can blow the armature 51 to rotate.

[0083] The electromagnetic trip unit 5 is located on the side of the extension plate 45 away from the arc blocking plate 41, and the position of the armature 51 on the electromagnetic trip unit 5 corresponds to the position of the air blow hole 451. In this way, the airflow ejected from the air blow hole 451 can directly act on the armature 51, and then the armature 51 can push the traction rod 3 to rotate. Finally, the traction rod 3 drives the molded case circuit breaker to quickly trip, thereby achieving the effects of reducing arc generation, accelerating arc extinction, and reducing pollutant generation.

[0084] This configuration can accelerate the discharge of high-temperature and high-pressure gas from the space where the arc-extinguishing chamber 13 and the rotating shaft 2 are located. It can also drive pollutants out of the air blow-out hole 451 through the airflow, thereby guiding the diffusion of gas and pollutants and reducing the risk of gas and pollutants spreading to the interphase area.

[0085] At the same time, the airflow from the exhaust air blowhole 451 can be used to blow the electromagnetic trip unit 5, so that the electromagnetic trip unit 5 can assist in achieving rapid circuit breaking, thereby reducing the generation of high temperature and high pressure gas and pollutants, further reducing the risk of phase-to-phase short circuit caused by the diffusion of gas and pollutants, and improving the phase-to-phase insulation performance.

[0086] Reference Figure 9 and Figure 10 In some examples, the extension plate 45 includes a continuous first drainage section 452 and a second drainage section 453, an air blowing hole 451 is disposed in the first drainage section 452, and the second drainage section 453 has a preset included angle with the first drainage section 452.

[0087] The extension plate 45 adopts a segmented flow-guiding design, comprising a first flow-guiding section 452 and a second flow-guiding section 453 arranged continuously. An air-blowing hole 451 is disposed in the first flow-guiding section 452 to guide the directional flow of arc gas. The second flow-guiding section 453 is connected to the first flow-guiding section 452 at a specific angle, forming a pre-set angled transition structure.

[0088] Specifically, the extension plate 45 extends from the mounting portion 42 towards the rotating shaft 2. The first guide portion 452 is located on the side of the extension plate 45 away from the rotating shaft 2, and the second guide portion 453 is located on the side of the extension plate 45 closer to the rotating shaft 2. The position of the air blow hole 451 corresponds to the force-bearing end of the armature 51, and the gas blown out of the air blow hole 451 can directly act on the force-bearing end of the armature 51. The extension direction of the second guide portion 453 is towards the very end of the force-bearing end of the armature 51, and the airflow can apply force to the end of the armature 51 along the second guide portion 453.

[0089] Reference Figure 9 and Figure 10 The first guide section 452 forms an initial airflow channel through the air blowing hole 451, while the second guide section 453 changes the airflow direction through an angled bend, achieving a better airflow organization effect. The preset angle causes the electric arc to form segmented stretching on the surface of the extension plate 45, accelerating the cooling and extinguishing of the arc. The continuous arrangement of the two guide sections ensures structural strength and optimizes the internal airflow field distribution through angle changes. The bend structure creates airflow disturbance, promoting the deposition of particulate matter in the second guide section 453 and reducing interphase contamination.

[0090] In typical implementations, the preset included angle is preferably within the range of 120°-150°, which can achieve optimal arc control while ensuring smooth airflow. This segmented current-draining structure is particularly suitable for the arc-extinguishing system design of large-capacity circuit breakers.

[0091] Reference Figure 9 In some examples, the end of the second drain section 453 is provided with a buffer section 454, which extends toward the armature 51.

[0092] The buffer section 454 can change the guiding direction again based on the second guide section 453, which can further lengthen the arc that diffuses to the extension plate 45, reduce the reignition rate, and prevent the arc from directly burning the surface of the armature 51, which is conducive to maintaining the stability of the electromagnetic trip device 5.

[0093] Specifically, the buffer section 454 is located at the end of the second flow guide 453. The buffer section 454 is a horizontally arranged strip structure, and the buffer section 454 and the armature 51 maintain a distance of 2 to 3 mm, which can achieve the best airflow control effect while ensuring structural strength.

[0094] Reference Figure 11 In some examples, a protective plate 14 is provided inside the base 1. The protective plate 14 is located between the arc-extinguishing chamber 13 and the rotating shaft 2. The arc-blocking plate 41 partially overlaps with the protective plate 14, and part of the arc-blocking plate 41 extends away from the base 1.

[0095] The base 1 contains a protective plate 14 structure, which is located at a critical position between the arc-extinguishing chamber 13 and the rotating shaft 2, forming a special cooperation relationship with the arc-blocking plate 41 of the partition assembly 4. The protective plate 14 and the arc-blocking plate 41 form a certain length of overlapping area near the base 1. This overlapping design ensures structural continuity and provides double protection against electric arc. Outside the overlapping area, the arc-blocking plate 41 continues to extend away from the base 1, forming an additional protective barrier.

[0096] Specifically, after the baffle assembly 4 is assembled to the base 1, the arc-damping plate 41 is located on the side of the protective plate 14 closest to the rotating shaft 2. This arrangement creates a stepped protective structure, where the protective plate 14 is mainly responsible for blocking the initial electric arc and direct thermal shock, while the extended arc-damping plate 41 provides subsequent secondary protection. Working together, they both extend the creepage path of the electric arc and effectively decompose the impact of the arc energy. The extended arc-damping plate 41 also additionally increases the protection area for critical components such as the rotating shaft 2, preventing direct intrusion of metal spatter and high-temperature gases.

[0097] The advantage of this design lies in its multi-layered protective arrangement, which significantly improves arc extinguishing efficiency and interphase insulation performance. The combination of the protective plate 14 and the arc-blocking plate 41 considers both structural strength requirements and optimizes the efficiency of internal airflow organization, enabling the arc to be confined within the arc-extinguishing chamber 13 and minimizing the diffusion of contaminants to the interphase region. This structure is particularly suitable for high-current breaking applications and can effectively cope with severe arc energy impacts.

[0098] Reference Figure 11In some examples, the arc-blocking plate 41 has a clearance groove 411, and the molded case circuit breaker also includes a stationary contact 8 and a moving contact 7. The stationary contact 8 is fixedly installed in the arc-extinguishing chamber 13, and the moving contact 7 is connected to the rotating shaft 2 and extends into the arc-extinguishing chamber 13 through the clearance groove 411.

[0099] An arc-blocking plate 41 has a clearance groove 411, a structural design that precisely matches the contact system of the circuit breaker. The molded case circuit breaker includes a stationary contact 8 and a moving contact 7 assembly. The stationary contact 8 is fixedly installed inside the arc-extinguishing chamber 13, while the moving contact 7 is mechanically connected to the rotating shaft 2. Through the special design of the clearance groove 411, the moving contact 7 can partially extend into the area of ​​the arc-extinguishing chamber 13, achieving reliable contact and separation with the stationary contact 8.

[0100] This clearance groove 411 structure has multiple functional characteristics. First, it provides precise guiding space for the movement of the moving contact 7, ensuring that the contact maintains the correct movement trajectory during opening and closing. Second, the contour shape of the clearance groove 411 is optimized to ensure the freedom of movement of the moving contact 7 while minimizing the leakage path of arc products. Furthermore, this structure makes the fit between the contact system and the arc-blocking plate 41 more compact, effectively utilizing the internal space of the circuit breaker.

[0101] In actual operation, when the circuit breaker trips, the moving contact 7, driven by the rotation of the shaft 2, quickly disengages from the stationary contact 8 along the path set by the clearance slot 411, and the generated arc is blocked by the arc-isolating plate 41 in the arc-extinguishing chamber 13. During the closing process, the moving contact 7, guided by the clearance slot 411, accurately resets to the contact position with the stationary contact 8. This design not only improves the reliability of the movement of the moving contact 7, but also significantly improves the arc-extinguishing efficiency by optimizing the arc path.

[0102] Reference Figure 1 and Figure 2 In some examples, the molded case circuit breaker also includes an operating mechanism 6, which is mounted on the assembly 42 and located on the side of the partition assembly 4 away from the rotating shaft 2. Part of the operating mechanism 6 passes through the assembly 42 and is connected to the rotating shaft 2 in a drive connection. The traction rod 3 is hinged to the operating mechanism 6.

[0103] The operating mechanism 6 is mounted on the mounting part 42 of the partition assembly 4 and is located on the side of the partition assembly 4 facing away from the rotating shaft 2. Some components of the operating mechanism 6 pass through the mounting part 42 and form a transmission connection with the rotating shaft 2 to realize the transmission of power. At the same time, the traction rod 3 is connected to the operating mechanism 6 by a hinge, forming a complete transmission system.

[0104] The operating mechanism 6 is positioned and installed through the assembly part 42. The design of some of its components passing through the assembly part 42 ensures both the directness of the transmission and the compactness of the structure. This reduces the diffusion of electric arcs, high-temperature and high-pressure gases, or contaminants to the operating mechanism 6, which is beneficial to maintaining the stability of the operating mechanism 6.

[0105] The hinged connection between the traction rod 3 and the operating mechanism 6 ensures the flexibility and reliability of the transmission process. The entire transmission system is located on one side of the partition assembly 4, a layout that facilitates maintenance and repair while effectively utilizing the internal space of the circuit breaker.

[0106] When the operating mechanism 6 is activated, it drives the rotating shaft 2 to rotate via the transmission assembly. Simultaneously, the hinged movement of the traction rod 3 effectively transmits the operating force to the relevant components. This arrangement not only ensures smooth operation but also minimizes interference between components through reasonable space allocation, thereby improving overall reliability. The partition assembly 4 serves as both a mounting platform and maintains good isolation performance, ensuring the insulation requirements between the operating mechanism 6 and other components.

[0107] Reference Figure 1 and Figure 11 In some examples, the side of the partition assembly 4 is provided with an overlap 46, which overlaps the side wall of the base 1.

[0108] The overlapping part 46 can form a simple closed structure with the side wall of the base 1, which can improve the installation stability of the partition assembly 4 on the base 1, and reduce the possibility of electric arc, high temperature and high pressure gas and pollutants spreading out from the gap between the partition assembly 4 and the side wall of the base 1. Together with the phase partition wall 11, the partition plate 43, the arc blocking plate 41 and the extension plate 45, it can effectively enhance the phase-to-phase insulation performance of the molded case circuit breaker.

[0109] The side of the partition assembly 4 may have only a small overlap 46. For example, the overlap 46 may be provided on the side near the arc-blocking plate 41 and near the extension plate 45, or the entire side may have a complete overlap 46. Such an overlap is more stable and has a better sealing effect with the side wall of the base 1.

[0110] Additionally, refer to Figure 12 The arc-blocking assembly, the operating mechanism 6, and the base 1 are connected by a threaded connection structure. Specifically, the assembly part 42 of the arc-blocking assembly is provided with multiple through holes 421, and the base 1 is provided with threaded holes 15 corresponding to the multiple through holes 421. The operating mechanism 6 is located on the side of the arc-blocking assembly away from the base 1, and the operating mechanism 6 is provided with through holes 61 corresponding to the multiple through holes 421. In this way, screws can be passed through both the through holes 61 and the through holes 421 and fixedly connected to the base 1.

[0111] This shortens the installation time between the arc-blocking assembly, operating mechanism 6, and base 1. It also demonstrates that the arc-blocking assembly, operating mechanism 6, and base 1 are detachably connected, requiring no complex processes or tools, allowing for rapid assembly and simple, convenient operation. Furthermore, it facilitates disassembly and maintenance of the arc-blocking assembly, operating mechanism 6, and base 1. The arc-blocking assembly, operating mechanism 6, and base 1 can also be replaced individually, saving costs.

[0112] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A molded case circuit breaker, characterized in that, include: The base is provided with at least one phase partition wall, and the phase partition wall is provided with a first support seat; A rotating shaft is rotatably mounted on the first support base, and the rotating shaft spans two adjacent phases; A traction rod is rotatably mounted on the base and spans two adjacent phases; The partition assembly includes an integrally formed arc-extinguishing plate and an assembly part. The arc-extinguishing plate blocks the arc-extinguishing chamber of the base and the rotating shaft. The assembly part is provided with a partition plate. The partition plate is provided with a first contour groove. The bottom of the first contour groove is provided with a first interlocking structure. The partition plate abuts against the adjacent partition wall, the first contour groove cooperates with the first support to wrap the rotating shaft, the rotating shaft is provided with a second pair of interlocking structures, and the second pair of interlocking structures are correspondingly inserted into the first pair of interlocking structures; The partition plate is also provided with a second support base, the second support base is provided with a second contour groove, and the traction rod is rotatably installed in the second contour groove.

2. The molded case circuit breaker according to claim 1, characterized in that, The first mating structure is configured as a mating slot, and the second mating structure is configured as a flange, or the first mating structure is configured as an arc-shaped boss, and the second mating structure is configured as a mating slot.

3. The molded case circuit breaker according to claim 1, characterized in that, The bottom of the second contour groove is provided with a third pair of interlocking structures, and the traction rod is provided with a fourth pair of interlocking structures. The third pair of interlocking structures and the fourth pair of interlocking structures are interlocked to form a dynamic sealing fit.

4. The molded case circuit breaker according to claim 1, characterized in that, The assembly part is also provided with an extension plate, which is opposite to the arc-blocking plate. An air blow hole is provided on the extension plate. The molded case circuit breaker also includes an electromagnetic trip unit, which includes a rotatably arranged armature. The airflow in the air blow hole can blow the armature to rotate.

5. The molded case circuit breaker according to claim 4, characterized in that, The extension plate includes a continuous first drainage section and a second drainage section, the air blowing hole is disposed in the first drainage section, and the second drainage section and the first drainage section have a preset included angle.

6. The molded case circuit breaker according to claim 5, characterized in that, The second drainage section has a buffer section at its end, which extends toward the armature.

7. The molded case circuit breaker according to any one of claims 1-6, characterized in that, The base is provided with a protective plate, which is located between the arc-extinguishing chamber and the rotating shaft. The arc-blocking plate partially overlaps with the protective plate, and part of the arc-blocking plate extends away from the base.

8. The molded case circuit breaker according to claim 7, characterized in that, The arc-blocking plate has a clearance groove, and the molded case circuit breaker also includes a stationary contact and a moving contact. The stationary contact is fixedly installed in the arc-extinguishing chamber, and the moving contact is connected to the rotating shaft and extends into the arc-extinguishing chamber through the clearance groove.

9. The molded case circuit breaker according to any one of claims 1-6, characterized in that, The molded case circuit breaker also includes an operating mechanism, which is installed in the assembly and located on the side of the partition assembly opposite to the rotating shaft. A portion of the operating mechanism passes through the assembly and is connected to the rotating shaft for transmission. The traction rod is hinged to the operating mechanism.

10. The molded case circuit breaker according to claim 1, characterized in that, The partition assembly has an overlapping portion on its side, which overlaps the outer side wall of the base.

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