Integrated contact conduction system for molded case circuit breaker

Abstract

The utility model discloses an integrated contact conductive system of moulded case circuit breaker, including contact subassembly, conductor subassembly and thermomagnetic tripping subassembly, conductor subassembly adopts straight row integral type conductive row, is equipped with wiring section, narrow body mounting section and coupling boss in length direction in proper order, and one end of soft conductor is welded fixed in coupling boss, and the other end is connected with moving contact, the U type yoke cover of magnetic tripping subassembly is equipped in narrow body mounting section and is fixed with bottom surface adhesion, and positioning support is clamped in the outside of yoke and is locked by fixed part synchronously, and the bimetallic strip of thermal tripping subassembly is installed in narrow body mounting section top and is arranged in dislocation with moving armature. The utility model discloses the modularization structure design of conductor subassembly and thermomagnetic tripping subassembly integration, reduces conductive switching node, reduces contact resistance and heating loss, and the compact structure, assembly is simple, is favorable to realize circuit breaker miniaturization, improves tripping action reliability, current -carrying stability and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and more specifically to an integrated contact conductive system for a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers are core components in low-voltage power distribution systems for circuit connection, disconnection, and overload and short-circuit fault protection. Their contact conductivity system is the core component for circuit connection and protection execution, and the structural design directly determines the circuit breaker's conductivity, protection characteristics, assembly efficiency, and miniaturization level.

[0003] The existing molded case circuit breaker contact system mainly consists of a moving contact assembly, a flexible conductor, a thermal element (transition conductive plate), a terminal block, and a thermomagnetic tripping structure. The moving contact assembly includes a contact shaft and several moving contacts. To accommodate the installation requirements of tripping components such as bimetallic strips and iron cores, the thermal element generally adopts a bent-form structure. The bimetallic strip and the magnetic tripping iron core are independently riveted or assembled at preset positions on the thermal element. The two ends of the flexible conductor are fixed to the moving contact and the thermal element respectively by welding. The thermal element, as a transition conductive plate, needs to be assembled step by step with the terminal block in the base to form a complete conductive path and protection linkage structure. As can be seen from the above structure, the existing integrated contact conductive system of molded case circuit breakers still has the following shortcomings: the assembly process of the entire contact conductive system is scattered, the number of parts is large, and the bending and processing of the thermal element and its step-by-step assembly with the terminal block are cumbersome, which significantly reduces the production and assembly efficiency. In particular, the thermal element, as an intermediate conductive component connected in series between the terminal block and the moving contact, has multiple nodes and bending structure, which increases the number of additional conductive contact points, leading to increased contact resistance and decreased current carrying stability, affecting the working performance and service life of the circuit breaker. It also occupies a large internal space, increases the axial length of the contact system, and restricts the miniaturization design and development of circuit breakers. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the problems of the existing circuit breaker contact conductive system, such as dispersed assembly processes, large number of parts, many conductive transition nodes, increased contact resistance, low overall structural space utilization, and unfavorable miniaturization design.

[0005] To address the aforementioned problems, this utility model provides an integrated contact conductivity system for a molded case circuit breaker, comprising a contact assembly, a conductor assembly, and a tripping mechanism. The contact assembly includes multiple moving contacts rotatably mounted within a rotating shaft sleeve. The conductor assembly includes a conductive bar fixed in a straight line within the circuit breaker base, and several flexible conductors connecting the conductive bar to the multiple moving contacts. The conductive bar, along its length, is sequentially provided with a wiring section, a narrow mounting section, and a connecting boss. The width of the narrow mounting section is smaller than the width of the wiring section and the connecting boss. Several fixing grooves are spaced apart on the connecting boss. One end of each flexible conductor is pressed into the fixing groove and welded in place, while the other end is fixedly connected to the moving contact. The tripping mechanism includes a thermal tripping assembly and a magnetic tripping assembly; the magnetic tripping assembly includes a U-shaped magnetic yoke sleeved on the narrow mounting section, a positioning bracket surrounding the outside of the U-shaped magnetic yoke, and a movable armature elastically swaying on the positioning bracket; the U-shaped magnetic yoke is fixed to the bottom surface of the narrow mounting section by a fixing member, and the positioning bracket is pressed between the U-shaped magnetic yoke and the fixing member; the thermal tripping assembly includes a bimetallic strip fixed to the top of the narrow mounting section and offset from the movable armature.

[0006] As a preferred embodiment, two symmetrical side slots are formed on both sides of the narrow mounting section, located between the wiring section and the connecting boss. The U-shaped magnetic yoke passes through the two side slots and hugs the side walls of the narrow mounting section. The positioning bracket has a U-shaped structure and has two bracket side plates that pass through the two side slots and clamp the sides of the U-shaped magnetic yoke. The superimposed thickness of the bracket side plates and the U-shaped magnetic yoke is not greater than the depth of the side slots.

[0007] As a preferred embodiment, the fastener is a fastening screw that extends upward from the bottom of the U-shaped bracket. The fastening screw passes sequentially through the positioning bracket and the U-shaped magnetic yoke and is locked and fixed with the bottom thread of the narrow mounting section.

[0008] As a preferred embodiment, the positioning bracket includes a first bracket arm and a second bracket arm disposed on the same side of each bracket side plate and facing each other vertically, wherein the length of the first bracket arm is greater than the length of the second bracket arm; the first bracket arm is formed with a limiting groove extending along its length, and the second bracket arm is formed with a rotating groove located above the limiting groove.

[0009] As a preferred embodiment, the moving armature is provided with a first connecting shaft and a second connecting shaft on both sides. The first connecting shaft is movably connected to the limiting groove of the first support arm, and the second connecting shaft is movably connected to the rotating groove of the second support arm, so that the moving armature has a swing structure with the second connecting shaft as the rotation fulcrum and the first connecting shaft sliding along the limiting groove.

[0010] As a preferred embodiment, the two support side plates are respectively provided with two third support arms extending away from the second support arm. The top sides of the moving armature are symmetrically provided with two spring support arms located above the two third support arms, and two armature springs are provided between the two spring support arms and the two third support arms.

[0011] As a preferred embodiment, the third support arm is set at the same height as the second support arm, the two third support arms are provided with hook grooves, the upper ends of the two spring support arms are bent and provided with hook holes, one end of the armature spring is hooked in the hook groove, and the other end is hooked in the hook hole.

[0012] As a preferred embodiment, the top of the narrow mounting section is provided with a positioning groove, the bimetallic strip has a fixed end that is fitted into the positioning groove by fasteners, and a vertically extending free end that can be bent by heat, the free end being provided with a bimetallic push rod facing the circuit breaker traction rod; the positioning groove is located below the moving armature, the bottom of the moving armature is provided with a clearance groove through which the bimetallic strip can pass, and the top of the moving armature is provided with an armature push rod inclined towards the circuit breaker traction rod.

[0013] As a preferred embodiment, the fixing groove is a rectangular groove, dovetail groove, or T-shaped groove formed on the connecting boss, and the soft conductor is a conductive braided strip formed by multiple strands of copper wire.

[0014] As a preferred embodiment, the rotating sleeve is rotatably mounted on the circuit breaker base, and has an accommodating space suitable for accommodating multiple moving contacts. Each of the multiple moving contacts includes a contact end extending out of one end of the rotating sleeve and a rotating end rotatably mounted inside the rotating sleeve. The rotating end is provided with a welding groove for welding and fixing to a soft conductor. The other end of the rotating sleeve is provided with a fixed baffle. Multiple contact springs are provided between the fixed baffle and the multiple moving contacts. One end of the contact spring is connected to the connecting hole of the fixed baffle, and the other end is connected to the hanging protrusion at the bottom of the moving contact.

[0015] As a preferred embodiment, each of the moving contacts is provided with a positioning protrusion on its side surface, and two adjacent moving contacts abut against each other through the positioning protrusion, so that a uniform equidistant gap is formed between each moving contact; at least one moving contact has an arc-inducing protrusion formed at its contact end extending toward the arc-extinguishing chamber of the circuit breaker.

[0016] The technical solution of this utility model has the following advantages compared with the prior art: 1. In the integrated contact conductive system provided by this utility model, the conductive busbar is configured as a straight structure comprising a wiring section, a narrow mounting section, and a connecting boss along its length. The two ends of the soft conductor are respectively thermo-pressurized and fixed to the connecting boss and the moving contact of the conductive busbar, forming a robust low-resistance connection and improving conductive stability. By integrating the thermal and magnetic tripping components onto the narrow mounting section of the conductive busbar and narrowing the width of the mounting section, a compact space is provided for the installation of the U-shaped magnetic yoke and positioning bracket. The U-shaped magnetic yoke is directly and firmly fixed to the bottom surface of the narrow mounting section using fasteners. The design optimizes the magnetic circuit coupling effect and improves the sensitivity of the short-circuit magnetic trip. By fixing the bimetallic strip of the thermal trip assembly to the top of the narrow mounting section and staggering it with the moving armature, interference between the thermal trip and magnetic trip can be avoided, ensuring reliable overload and short-circuit protection. The above structural design integrates the contact conductive assembly and the thermal-magnetic trip assembly into a highly modular contact conductive system, which can be assembled into the circuit breaker base. This optimizes the internal space layout of the product, facilitates the miniaturization and compact design of the circuit breaker, simplifies the overall assembly process, and improves assembly efficiency and product performance consistency.

[0017] 2. In the integrated contact conductive system provided by this utility model, the moving armature forms a sliding fit with the limiting groove on the first support arm through the first connecting shaft, and a positioning rotation fit with the rotating groove on the second support arm through the second connecting shaft. This constitutes a non-coaxial swing structure with the second connecting shaft as the fulcrum and the first connecting shaft sliding along the limiting groove. This can realize the functional distinction between the rotation fulcrum and the sliding limit of the moving armature, making the force distribution of the moving armature more uniform. The long first support arm and the long stroke limiting groove provide sufficient swing space for the moving armature, while forming a reliable limit on the maximum swing stroke of the moving armature, preventing reset failure caused by excessive swing. This structural design can optimize the air gap change shape between the moving armature and the magnetic yoke, and improve the sensitivity and response speed of the magnetic tripping action.

[0018] 3. In the integrated contact conductive system provided by this utility model, by setting positioning protrusions on the side surface of each moving contact, adjacent moving contacts can abut against each other through the protrusions, which can form a uniform and consistent equidistant gap between multiple moving contacts. This design ensures that the current is evenly distributed on each moving contact, avoids overheating caused by excessive local current density, and forms an independent air convection heat dissipation channel between each moving contact through the uniform equidistant gap, which can effectively reduce the overall temperature rise of the contact. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This is a side view of the contact conductive system provided by this utility model; Figure 2 This is a cross-sectional view of the contact conductive system provided by this utility model; Figure 3 This is a schematic diagram of the planar structure of the contact assembly of this utility model; Figure 4 This is a schematic diagram of the installation structure of the tripping mechanism and the conductive busbar of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Conductive busbar; 11. Wiring section; 12. Narrow mounting section; 13. Connecting boss; 14. Fixing groove; 15. Positioning groove; 2. Soft conductor; 3. Contact assembly; 31. Moving contact; 32. Rotating shaft sleeve; 33. Fixing baffle; 34. Contact spring; 35. Hanging boss; 36. Arc-inducing protrusion; 37. Positioning protrusion; 4. U-shaped magnetic yoke; 5. Positioning bracket; 50. Bracket side plate; 51. First bracket arm; 52. Second bracket arm; 53. Third bracket arm; 54. Limiting groove; 55. Rotating groove; 6. Moving armature; 61. First connecting shaft; 62. Second connecting shaft; 63. Spring support arm; 64. Armature push rod; 7. Armature spring; 8. Bimetallic strip; 81. Bimetallic push rod; 9. Fixing component. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0025] Example This embodiment provides, as follows: Figures 1-4 The diagram illustrates an integrated contact conduction system for a molded case circuit breaker. This system is integrally installed inside the circuit breaker base and mainly includes a contact assembly 3, a conductor assembly, and a tripping mechanism. The contact assembly 3 includes multiple moving contacts 31 rotatably mounted within a rotating shaft sleeve 32, which is rotatably positioned within the base. The conductor assembly includes a conductive busbar 1 fixed in a straight line within the circuit breaker base, and several flexible conductors 2 connecting the conductive busbar 1 to the multiple moving contacts 31. The conductive busbar 1, along its length, is sequentially provided with a wiring section 11, a narrow mounting section 12, and a connecting boss 13. The width of the narrow mounting section 12 is smaller than that of the connecting boss 12. The width of the wiring segment and the connecting boss 13; the tripping mechanism adopts a thermomagnetic dual protection structure combining a thermal tripping assembly and a magnetic tripping assembly. The magnetic tripping assembly includes a U-shaped magnetic yoke 4 sleeved on the narrow mounting section 12, a positioning bracket 5 surrounding the outside of the U-shaped magnetic yoke 4, and a movable armature 6 elastically swingable on the positioning bracket; the U-shaped magnetic yoke 4 is fixed to the bottom surface of the narrow mounting section 12 by a fixing member, and the positioning bracket 5 is pressed between the U-shaped magnetic yoke 4 and the fixing member; the thermal tripping assembly includes a bimetallic strip 8 fixed to the top of the narrow mounting section 12 and staggered from the movable armature.

[0026] In the above embodiments, based on the integrated modular structure design of the conductor assembly and the tripping mechanism, the conductive bus 1 is configured as a straight structure that sequentially includes a wiring section 11, a narrow mounting section 12, and a connecting boss 13 along its length. This eliminates the traditional bent transition heating element. The two ends of the soft conductor 2 are respectively heat-pressed and welded to the connecting boss 13 and the moving contact 31 of the conductive bus, forming a robust low-resistance connection, improving conductivity stability, simplifying parts processing, and reducing manufacturing costs. By integrating the thermal tripping assembly and the magnetic tripping assembly onto the narrow mounting section 12 of the conductive bus, and narrowing the width of the narrow mounting section, a compact space is provided for the installation of the U-shaped magnetic yoke and the positioning bracket. The yoke 4 is directly attached to the bottom surface of the narrow mounting section 12 by a fastener, which optimizes the magnetic circuit coupling effect and improves the sensitivity of the short-circuit magnetic trip. The bimetallic strip 8 of the thermal trip assembly is fixed to the top of the narrow mounting section 12 and is staggered with the moving armature to avoid interference between the thermal trip and the magnetic trip, ensuring reliable overload and short-circuit protection. The above structural design integrates the contact conductive assembly and the thermal-magnetic trip assembly into a highly modular integrated contact conductive system, which can be assembled into the circuit breaker base. This optimizes the internal space layout of the product, facilitates the miniaturization and compact design of the circuit breaker, simplifies the overall assembly process, reduces the cumulative assembly error, and improves the mass production assembly efficiency and product performance consistency.

[0027] The specific structure of the conductor assembly is described in detail below. This conductor assembly serves as the conductive carrier and mounting base of the contact conductivity system. It adopts an integrated, straight-line structure for the conductor bar 1, eliminating the need for additional transition conductive components. This effectively reduces conductive contact points, lowers loop resistance, and reduces heat loss. Figure 4 As shown, the connecting boss 13 of the conductive busbar 1 is provided with several fixed grooves 14 at intervals. One end of the flexible conductor 2 is pressed into the fixed groove 14 and welded to fix it, while the other end is welded to the moving contact 31. The connecting boss 13 is a solid structure formed by the upward protrusion of the end of the conductive busbar. Its height is higher than that of the narrow mounting section 12, and its width is consistent with that of the wiring section 11. Designing the connecting boss as a heightened structure can deepen the opening depth of the fixed groove 14, allowing the flexible conductor to be fully embedded in the groove for hot-press welding, greatly increasing the welding contact area and improving the reliability and mechanical strength of the conductive connection. The fixed groove 14 can preferably be a rectangular groove, a dovetail groove, or a T-shaped groove. The flexible conductor 2 is a conductive braided strip formed by multi-strand copper wire. Two symmetrical side slots are formed on both sides of the narrow mounting section 12, located between the wiring section 11 and the connecting boss 13, providing space for the nested installation of the magnetic trip assembly. The structural design of the side slots is matched with the installation dimensions of the magnetic trip assembly to achieve a compact layout.

[0028] The following is combined with Figures 2-4 The specific setup methods for magnetic tripping and thermal tripping assemblies are explained in detail below: The U-shaped magnetic yoke 4 passes through two side slots and hugs the two side walls of the narrow mounting section 12. The positioning bracket 5 has a U-shaped structure and has two bracket side plates 50 that pass through the two side slots and clamp the two sides of the U-shaped magnetic yoke 4. The superposition thickness of the bracket side plates 50 and the U-shaped magnetic yoke 4 is not greater than the depth of the side slots. This design can achieve a compact arrangement of the magnetic tripping assembly without increasing the overall width of the conductive system, ensuring that the magnetic tripping assembly does not exceed the outer contour of the conductive busbar 1 after installation, and further adapting to the miniaturization design of the circuit breaker. In a further preferred configuration, the fixing component is a fastening screw that passes upward from the bottom of the U-shaped bracket. The bottom surface of the narrow mounting section 12 is provided with a threaded hole that mates with the fastening screw, so that the fastening screw passes through the positioning bracket 5 and the U-shaped magnetic yoke 4 in sequence and is locked and fixed with the thread on the bottom surface of the narrow mounting section 12. With this structural configuration, the positioning bracket 5 and the magnetic yoke remain in close contact under the action of the screw, further ensuring the reliability of the contact between the U-shaped magnetic yoke and the bottom surface of the conductive busbar, avoiding loose parts or excessive gaps that may affect the tripping performance, improving assembly efficiency and structural stability, and enhancing magnetic tripping sensitivity and action stability.

[0029] The positioning bracket 5 includes a first bracket arm 51 and a second bracket arm 52, which are arranged vertically opposite each other on the same side of each bracket side plate 50. The length of the first bracket arm 51 is greater than the length of the second bracket arm 52. The first bracket arm 51 is formed with a limiting groove 54 extending along its length, and the second bracket arm 52 is formed with a rotating groove 55 located above the limiting groove 54. Correspondingly, the moving armature 6 has a first connecting shaft 61 and a second connecting shaft 62 on both sides. The first connecting shaft 61 is movably connected to the limiting groove 54 of the first bracket arm 51, and the second connecting shaft 62 is movably connected to the rotating groove 55 of the second bracket arm 52. The swing structure, in which the moving armature 6 rotates around the second connecting shaft 62 and slides along the limiting groove 54 on the first connecting shaft 61, allows for the functional differentiation between the rotation fulcrum and the sliding limit of the moving armature 6. This design makes the force distribution on the moving armature 6 more uniform. The long first support arm 51 and the long-stroke limiting groove 54 provide ample swing space for the moving armature 6, while reliably limiting the maximum swing stroke of the moving armature 6 to prevent reset failure caused by excessive swing. This structure optimizes the air gap change pattern between the moving armature and the yoke, improves the magnetic circuit coupling efficiency and magnetic energy utilization, and enhances the sensitivity and response speed of the magnetic tripping action.

[0030] like Figure 4 As shown, the movable armature 6 is oscillatingly mounted on two support side plates 50 relative to the U-shaped magnetic yoke 4. Each of the two support side plates 50 has two third support arms 53 extending away from the second support arm 52. Two spring support arms 63 are symmetrically positioned above the two third support arms 53 on both sides of the top of the movable armature 6. Two armature springs 7 are positioned between the two spring support arms 63 and the two third support arms 53. The third support arms 53 are at the same height as the second support arm 52. The two third support arms 53 have hook grooves, and the upper ends of the two spring support arms 63 have a bent structure and hook holes. One end of the armature spring 7 is hooked into the hook groove, and the other end is hooked into the hook hole. This structure connects the two sets of armature springs 7 to the two spring support arms 63 and the two third support arms 53 respectively, forming a double-sided symmetrical elastic reset structure. This layout, in which the armature springs 7 are arranged above the swing area of ​​the moving armature 6, does not occupy the swing space of the armature and does not interfere with the rotation fulcrum. It realizes the zoned arrangement of the tripping rotation and reset function of the moving armature 6. The armature spring 7 provides a stable and balanced reset torque for the moving armature 6, so that the moving armature is subjected to balanced force and can be quickly and accurately reset after the tripping action.

[0031] In a further preferred configuration, the top of the narrow mounting section 12 is provided with a positioning groove 15. The bimetallic strip 8 has a fixed end that is fitted into the positioning groove 15 by fasteners, and a vertically extending free end that can be bent and deformed by heat. The free end is provided with a bimetallic push rod 81 facing the circuit breaker traction rod. The top of the moving armature 6 is provided with an armature push rod 64 that is inclined towards the circuit breaker traction rod, which shortens the magnetic tripping transmission stroke and improves the response speed and action accuracy of short circuit protection. The positioning groove 15 is located below the moving armature 6, and the bottom of the moving armature 6 is provided with a clearance groove through which the bimetallic strip 8 can pass, so that the bimetallic strip and the moving armature are staggered. Structurally, this avoids mutual interference between thermal tripping action and magnetic tripping action, ensuring that overload and short circuit protection are executed independently and reliably.

[0032] Next, let's combine... Figures 1-3 The specific structure of the contact assembly is described in detail: The rotating sleeve 32 is rotatably mounted on the circuit breaker base, and has an accommodating space suitable for accommodating multiple moving contacts 31. Each of the multiple moving contacts 31 includes a contact end extending out of the rotating sleeve 32 and a rotating end rotatably mounted inside the rotating sleeve 32. The rotating end is provided with a welding groove for welding and fixing to the flexible conductor 2, which improves the welding positioning accuracy and connection reliability of the flexible conductor 2. The other end of the rotating sleeve 32 is provided with a fixed baffle 33. Multiple contact springs 34 are provided between the fixed baffle 33 and the multiple moving contacts 31. One end of the contact spring 34 is connected to the connection hole of the fixed baffle 33, and the other end is connected to the hanging boss 35 at the bottom of the moving contact 31. This design ensures that each moving contact 31 is independently equipped with a contact spring 34, ensuring that each moving contact 31 receives uniform contact pressure and improving contact stability. Each moving contact 31 has a positioning protrusion 37 on its side surface. Two adjacent moving contacts 31 abut against each other through the positioning protrusion 37, so that a uniform and equidistant gap is formed between each moving contact 31. The uniform gap can ensure that the current is evenly distributed on each moving contact, and at the same time form an independent air convection heat dissipation channel, which accelerates heat dissipation, reduces contact temperature rise, improves current carrying capacity and operational reliability under high current conditions, and can also play a lateral guiding role for the swing of the moving contact, improving the synchronization of multi-contact operation.

[0033] To improve the arc ignition efficiency of the contact assembly, at least one moving contact 31 has an arc ignition protrusion 36 formed at its contact end, extending toward the arc-extinguishing chamber of the circuit breaker. Specifically, the moving contact 31 in the middle position has the arc ignition protrusion 36 formed, so that the arc can be ignited first when the contact breaks, and the arc can be quickly guided to the arc-extinguishing chamber, which greatly shortens the residence time of the arc on the working surface of the main contact, protects the contact from ablation, extends the service life of the contact, and improves the breaking capacity of the circuit breaker.

[0034] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An integrated contact conduction system for a molded case circuit breaker, comprising a contact assembly (3), a conductor assembly, and a tripping mechanism; wherein the contact assembly (3) includes a plurality of moving contacts (31) rotatably mounted within a rotating shaft sleeve (32), characterized in that: The conductor assembly includes a conductive bus (1) fixed in a straight line within the circuit breaker base, and several flexible conductors (2) connecting the conductive bus (1) to multiple moving contacts (31). The conductive bus (1) is provided with a wiring section (11), a narrow mounting section (12), and a connecting boss (13) in sequence along its length. The width of the narrow mounting section (12) is smaller than the width of the wiring section and the connecting boss (13). Several fixing grooves (14) are provided at intervals on the connecting boss (13). One end of the flexible conductor (2) is pressed into the fixing groove (14) and welded and fixed, and the other end is fixedly connected to the moving contact (31). The tripping mechanism includes a thermal tripping assembly and a magnetic tripping assembly; the magnetic tripping assembly includes a U-shaped magnetic yoke (4) sleeved on the narrow mounting section (12), a positioning bracket (5) surrounding the outside of the U-shaped magnetic yoke (4), and a movable armature (6) elastically swingable on the positioning bracket; the U-shaped magnetic yoke (4) is fixed to the bottom surface of the narrow mounting section (12) by a fixing member (9), and the positioning bracket (5) is pressed between the U-shaped magnetic yoke (4) and the fixing member (9); the thermal tripping assembly includes a bimetallic strip (8) fixed to the top of the narrow mounting section (12) and offset from the movable armature.

2. The integrated contact conduction system of claim 1, wherein: The narrow mounting section (12) has two symmetrical side slots formed on both sides, located between the wiring section (11) and the connecting boss (13). The U-shaped magnetic yoke (4) passes through the two side slots and hugs the two side walls of the narrow mounting section (12). The positioning bracket (5) has a U-shaped structure and has two bracket side plates (50) that pass through the two side slots and clamp the two sides of the U-shaped magnetic yoke (4). The superimposed thickness of the bracket side plates (50) and the U-shaped magnetic yoke (4) is not greater than the depth of the side slots.

3. The integrated contact conduction system of claim 1, wherein: The fastener (9) is a fastening screw that extends upward from the bottom of the U-shaped bracket. The fastening screw passes through the positioning bracket (5) and the U-shaped magnetic yoke (4) in sequence and is locked and fixed with the bottom thread of the narrow body mounting section (12).

4. The integrated contact conduction system of any of claims 1-3, wherein: The positioning bracket (5) includes a first bracket arm (51) and a second bracket arm (52) arranged opposite each other on the same side of each bracket side plate (50). The length of the first bracket arm (51) is greater than the length of the second bracket arm (52). The first bracket arm (51) is formed with a limiting groove (54) extending along its length, and the second bracket arm (52) is formed with a rotating groove (55) located above the limiting groove.

5. The integrated contact conduction system of claim 4, wherein: The moving armature (6) has a first connecting shaft (61) and a second connecting shaft (62) on both sides. The first connecting shaft (61) is movably connected to the limiting groove (54) of the first support arm (51), and the second connecting shaft (62) is movably connected to the rotating groove (55) of the second support arm (52), so that the moving armature (6) has a swing structure with the second connecting shaft (62) as the rotation fulcrum and the first connecting shaft (61) sliding along the limiting groove (54).

6. The integrated contact conductive system according to claim 4, characterized in that: The two support side plates (50) are respectively provided with two third support arms (53) extending away from the second support arm (52). The top sides of the moving armature (6) are symmetrically provided with two spring support arms (63) located above the two third support arms (53). Two armature springs (7) are provided between the two spring support arms (63) and the two third support arms (53). The third support arm (53) is set at the same height as the second support arm (52). The two third support arms (53) are provided with hook grooves. The upper ends of the two spring support arms (63) are bent and provided with hook holes. One end of the armature spring (7) is hooked in the hook groove and the other end is hooked in the hook hole.

7. The integrated contact conduction system of claim 1, wherein: The top of the narrow mounting section (12) is provided with a positioning groove (15). The bimetallic strip (8) has a fixed end that is fitted into the positioning groove (15) and a free end that extends vertically and can be bent by heat. The free end is provided with a bimetallic push rod (81) facing the circuit breaker traction rod. The positioning groove (15) is located below the moving armature (6). The bottom of the moving armature (6) is provided with a clearance groove through which the bimetallic strip (8) can pass. The top of the moving armature (6) is provided with an armature push rod (64) that is inclined towards the circuit breaker traction rod.

8. The integrated contact conduction system of claim 1, wherein: The fixing groove (14) is a rectangular groove, dovetail groove or T-shaped groove formed on the connecting boss (13), and the soft conductor (2) is a conductive braided strip woven from multiple strands of copper wire.

9. The integrated contact conduction system of claim 1, wherein: The rotating sleeve (32) is rotatably mounted on the circuit breaker base. Each of the multiple moving contacts (31) includes a contact end extending out of one end of the rotating sleeve (32) and a rotating end rotatably mounted inside the rotating sleeve (32). The other end of the rotating sleeve (32) is provided with a fixed baffle (33). Multiple contact springs (34) are provided between the fixed baffle (33) and the multiple moving contacts (31). One end of the contact spring (34) is connected to the connecting hole of the fixed baffle (33), and the other end is connected to the hanging boss (35) at the bottom of the moving contact (31).

10. The integrated contact conduction system of claim 9, wherein: Each of the moving contacts (31) has a positioning protrusion (37) on its side surface. Two adjacent moving contacts (31) abut against each other through the positioning protrusion (37) so that a uniform equidistant gap is formed between each moving contact (31). At least one moving contact (31) has an arc-inducing protrusion (36) formed at its contact end, extending toward the arc-extinguishing chamber of the circuit breaker.

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