Circuit breaker

Abstract

The utility model provides a circuit breaker, which belongs to the field of electrical equipment and comprises a shell and a connecting shaft fixed on the shell. The double-contact torsion spring comprises a first torsion spring and a second torsion spring which are connected with each other, and the first torsion spring and the second torsion spring have the same rotation direction and are arranged on the connecting shaft side by side; the double-contact torsion spring is provided with a connecting end and a free end, the free end comprises a first free end of the first torsion spring and a second free end of the second torsion spring, and the first free end is not connected with the second free end; the N-pole moving contact assembly is connected with the first free end; the L-pole moving contact assembly is connected with the second free end; when the double-contact torsion spring rotates, the N-pole moving contact assembly and the L-pole moving contact assembly can be driven to move at the same time, the contact pressure of the N-pole moving contact assembly and the contact pressure of the L-pole moving contact assembly can be controlled at the same time, the stability of the circuit breaker is guaranteed, assembling is convenient, and the manufacturing efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrical connection devices, and in particular to a circuit breaker. Background Art

[0002] With the increasing popularity and intelligent development of household appliances, households are increasingly demanding electrical safety. As a crucial device for protecting household wiring and appliances, the design and performance of DPN miniature circuit breakers directly impact the safety and reliability of household electricity use. The existing DPN miniature circuit breaker width is 18mm, allowing more DPN miniature circuit breakers to be installed in a distribution box with the same number of poles, thus meeting the growing demand for appliance protection.

[0003] However, existing DPN miniature circuit breakers (MCBs) have shortcomings in contact pressure control. Some currently use a single tension spring design, which can only control the contact pressure of one pole, and cannot simultaneously control the contact pressure of both the left and north poles. This leads to unstable contact, unqualified temperature rise, and a shortened lifespan. Other DPN MCBs use tension springs for both the left and north pole contacts, but this design significantly increases assembly difficulty, increases production costs, and impacts market competitiveness.

[0004] Therefore, there is an urgent need to provide a circuit breaker that can simultaneously and stably control the L-pole and N-pole contact pressures to ensure the safe use of household circuits and electrical appliances, while also reducing assembly difficulty and improving production efficiency. Utility Model Content

[0005] The present application provides a circuit breaker that can simultaneously and stably control the L-pole and N-pole contact pressures to ensure the safe use of household wiring and electrical appliances, while also reducing assembly difficulty and improving production efficiency.

[0006] In a first aspect, the present application provides a circuit breaker, comprising a housing; a connecting shaft fixed to the housing; a double-contact torsion spring, the double-contact torsion spring comprising a first torsion spring and a second torsion spring connected to each other, the first torsion spring and the second torsion spring having the same rotation direction and being mounted side by side on the connecting shaft; the double-contact torsion spring having a connecting end and a free end, the connecting end being an end at which the first torsion spring and the second torsion spring are connected, the free end comprising a first free end of the first torsion spring and a second free end of the second torsion spring, the first free end and the second free end being not connected; further comprising an N-pole moving contact assembly and an L-pole moving contact assembly, the N-pole moving contact assembly being connected to the first free end; the L-pole moving contact assembly being connected to the second free end; the double-contact torsion spring rotates, thereby driving the N-pole moving contact assembly and the L-pole moving contact assembly to move at the same time.

[0007] Through the above scheme, the design of the double-contact torsion spring includes a first torsion spring and a second torsion spring that are connected. The first torsion spring and the second torsion spring have the same rotation direction and are installed side by side on the connecting shaft. In this way, when the double-contact torsion spring rotates, the first torsion spring and the second torsion spring rotate in phase. Since the free ends of the double-contact torsion spring are respectively connected to the N-pole moving contact assembly and the L-pole moving contact assembly, the double-contact torsion spring can simultaneously drive the N-pole moving contact assembly and the L-pole moving contact assembly to move when it rotates. Such a design can simultaneously control the contact pressure of the N-pole moving contact assembly and the L-pole moving contact assembly, thereby ensuring the stability of the circuit breaker. Moreover, since the double-contact torsion spring is designed as an integrated whole, it has fewer parts, is easy to assemble, improves manufacturing efficiency, and reduces manufacturing costs.

[0008] In one possible design, it also includes an N-pole static contact assembly corresponding to the N-pole moving contact assembly and an L-pole static contact assembly corresponding to the L-pole moving contact assembly, and the distance between the N-pole static contact assembly and the N-pole moving contact assembly is smaller than the distance between the L-pole static contact assembly and the L-pole moving contact assembly.

[0009] Through the above scheme, at the moment the operating mechanism of the circuit breaker is closed, it is ensured that the N-pole moving contact assembly is closed with the N-pole static contact assembly first, and then the L-pole moving contact assembly is closed with the corresponding L-pole static contact assembly; at the moment the operating mechanism of the circuit breaker is disconnected, it is ensured that the N-pole moving contact assembly is disconnected with the N-pole static contact assembly first, and then the L-pole moving contact assembly is disconnected with the corresponding L-pole static contact assembly. This design can optimize the flow and disconnection process of current, reduce the generation of arcs, and improve the breaking capacity of the circuit breaker. Therefore, when the movement of the N-pole moving contact assembly and the L-pole moving contact assembly is controlled simultaneously, because the distance between the N-pole static contact assembly and the N-pole moving contact assembly is smaller than the distance between the L-pole static contact assembly and the L-pole moving contact assembly, the N-pole static contact assembly and the N-pole moving contact assembly are contacted and closed first, and then the L-pole static contact assembly and the L-pole moving contact assembly are contacted and closed, forming a circuit, thereby ensuring the breaking capacity of the circuit breaker.

[0010] In a possible design, it also includes a torsion spring support, which is provided with a first through hole passing through the torsion spring support and a first slot located on the torsion spring support, the connecting end is clamped in the first slot, the first torsion spring and the second torsion spring are respectively on both sides of the first through hole, and the connecting shaft passes through the first torsion spring, the first through hole and the second torsion spring in sequence.

[0011] Through the above scheme, the double-contact torsion spring is installed in the housing through the torsion spring support. Since the torsion spring support is provided with a first slot, the double-contact torsion spring can be fixed to the torsion spring support by clamping the connecting end in the first slot. At the same time, the double-contact torsion spring can be installed side by side in the same phase through the first through hole, so that stable installation and precise control of the double-contact torsion spring can be achieved.

[0012] In one possible design, the N-pole moving contact assembly and the L-pole moving contact assembly are respectively arranged on both sides of the torsion spring support. When the torsion spring support rotates around the connecting shaft, the N-pole moving contact assembly and the L-pole moving contact assembly are driven to move simultaneously.

[0013] Through the above solution, the N-pole moving contact assembly and the L-pole moving contact assembly are respectively arranged on both sides of the torsion spring support, so that when the torsion spring support rotates with the connecting shaft as the axis, the N-pole moving contact assembly and the L-pole moving contact assembly are driven to move simultaneously, thereby being able to simultaneously control the final pressure of the N-pole moving contact assembly and the L-pole moving contact assembly, which helps to improve the performance and reliability of the circuit breaker.

[0014] With this solution, a first connecting structure is provided on the side of the N-pole contact support facing the first free end, which engages with the first free end. Similarly, a second connecting structure is provided on the side of the L-pole contact support facing the second free end, which engages with the second free end. This design simplifies the contact assembly process, improves manufacturing efficiency and product stability, ensures precise connection between the moving contact assembly and the torsion spring, and allows for synchronized operation.

[0015] With this solution, a first connecting structure is provided on the side of the N-pole contact support facing the first free end, which engages with the first free end. Similarly, a second connecting structure is provided on the side of the L-pole contact support facing the second free end, which engages with the second free end. This design simplifies the contact assembly process, improves manufacturing efficiency and product stability, ensures precise connection between the moving contact assembly and the torsion spring, and allows for synchronized operation.

[0016] In a possible design, it also includes an N-pole static contact assembly and an L-pole static contact assembly fixed in the housing, the N-pole static contact assembly corresponds to the N-pole moving contact assembly, the L-pole static contact assembly corresponds to the L-pole moving contact assembly, a first arc baffle is provided above the N-pole static contact assembly, and a second arc baffle is provided on the N-pole contact support; a third arc baffle is provided above the L-pole static contact assembly, and a fourth arc baffle is provided on the L-pole contact support; when the N-pole moving contact assembly moves toward the N-pole static contact assembly and closes with the N-pole static contact assembly When the N-pole moving contact assembly moves in a direction away from the N-pole static contact assembly and is disconnected from the N-pole static contact assembly, the second arc baffle plate and the first arc baffle plate have an overlapping area; when the L-pole moving contact assembly moves toward the L-pole static contact assembly and closes with the L-pole static contact assembly, the fourth arc baffle plate is located above or below the third arc baffle plate; when the L-pole moving contact assembly moves in a direction away from the L-pole static contact assembly and is disconnected from the L-pole static contact assembly, the fourth arc baffle plate and the third arc baffle plate have an overlapping area.

[0017] The above solution, by providing arc shields above the N-pole and L-pole movable contact assemblies and their corresponding stationary contact assemblies, effectively controls and manages arcs during contact closing and opening. When the movable contact assembly and the stationary contact assembly disconnect, an arc is generated. Because a first arc shield is provided above the N-pole stationary contact assembly, a second arc shield is provided on the corresponding N-pole contact support, and a third arc shield is provided above the L-pole stationary contact assembly, and a fourth arc shield is provided on the corresponding L-pole contact support, the arc shielding surface formed by the combination of the first arc shield, the second arc shield, and the third arc shield can prevent the arc from moving upward, thereby preventing damage to the operating mechanism.

[0018] In a possible design, the first arc baffle plate, the second arc baffle plate, the third arc baffle plate and the fourth arc baffle plate are all arc-shaped plates.

[0019] The curved arc-blocking plate design described above helps improve creepage distance. This is because creepage distance is the shortest path along the insulating surface between two conductive parts, or between a conductive part and the protective interface of the equipment. The curved plates increase the length of this path along the surface, thereby improving insulation performance and reducing the likelihood of arcing. The shape and position of the first, second, third, and fourth arc-blocking plates effectively enhance the circuit breaker's arc control capabilities, thereby improving its performance and reliability.

[0020] In a possible design, a partition plate is provided between the N-pole moving contact assembly, the N-pole static contact assembly and the L-pole moving contact assembly, and the L-pole static contact assembly; a first gap is provided between the second arc blocking plate and the partition plate, and the distance between the second arc blocking plate and the partition plate is the width D1 of the first gap; a first arc blocking protrusion is fixedly provided on the side of the partition plate facing the N-pole moving contact assembly, the first arc blocking protrusion is located below the second arc blocking plate, and the first arc blocking protrusion extends from the N-pole static contact assembly toward the N-pole moving contact assembly, and the first arc blocking protrusion extends from the surface of the partition plate toward the N-pole moving contact assembly. The height of the protrusion of the L-pole moving contact assembly is a first height H1, H1>D1; there is a second gap between the fourth arc blocking plate and the partition plate, and the distance between the fourth arc blocking plate and the partition plate is the width D2 of the second gap. A second arc blocking protrusion is fixedly provided on the side of the partition plate facing the L-pole moving contact assembly, and the second arc blocking protrusion is located below the fourth arc blocking plate. In addition, the second arc blocking protrusion extends from the L-pole static contact assembly toward the L-pole moving contact assembly, and the height of the second arc blocking protrusion from the surface of the partition plate to the L-pole moving contact assembly is a second height H2, H2>D2.

[0021] The above solution utilizes a separator plate to effectively separate the N-pole and L-pole contact assemblies, allowing each to maintain its own independent space, reducing mutual interference and facilitating contact assembly maintenance and replacement. The design of the first arc-blocking protrusion helps more effectively guide and control the arc generated when the N-pole moving contact opens, preventing it from escaping upward and burning the conductive components, thereby reducing arc damage to the contacts and surrounding components. The H1 > D1 ratio further ensures an overlap between the first arc-blocking protrusion and the separator plate, eliminating any direct gap between them and preventing the arc from escaping directly upward. The design of the second arc-blocking protrusion helps more effectively guide and control the arc generated when the L-pole moving contact opens, preventing it from escaping upward and burning the conductive components, thereby reducing arc damage to the contacts and surrounding components. The H2 > D2 ratio further ensures an overlap between the second arc-blocking protrusion and the separator plate, eliminating any direct gap between them and preventing the arc from escaping directly upward. Furthermore, the modular design of the separator plate and arc-blocking protrusions allows for easier access and replacement of relevant components when maintenance or upgrades are required, improving maintenance convenience.

[0022] In one possible design, the shell is divided into a first shell and a second shell, the first shell and the partition plate form a first accommodating chamber, the N-pole moving contact assembly and the N-pole static contact assembly are located in the first accommodating chamber, a second accommodating chamber is formed between the second shell and the partition plate, the L-pole moving contact assembly and the L-pole static contact assembly are located in the second accommodating chamber; the two sides of the first arc baffle plate are respectively fixed on the partition plate and the first shell facing the first accommodating chamber; the two sides of the third arc baffle plate are respectively fixed on the partition plate and the second shell facing the second accommodating chamber.

[0023] Through the above solution, by placing the N-pole moving contact assembly and the N-pole static contact assembly in the first accommodating chamber and the L-pole moving contact assembly and the L-pole static contact assembly in the second accommodating chamber, the two groups of contact assemblies can be effectively isolated, electromagnetic interference between them can be reduced, and the stability and reliability of the circuit breaker can be improved. The two sides of the first arc baffle are respectively fixed to the partition plate facing the first accommodating chamber and the first shell, so that there is no gap between the first arc baffle and the first accommodating chamber and the partition plate, respectively, to achieve a better physical isolation effect and prevent the arc in the first accommodating chamber from escaping upward. Similarly, the two sides of the third arc baffle are respectively fixed to the partition plate facing the second accommodating chamber and the second shell, so that there is no gap between the third arc baffle and the second shell and the partition plate, thereby achieving a better physical isolation effect and preventing the arc in the second accommodating chamber from escaping upward.

[0024] In one possible design, there is a third gap between the second arc baffle plate and the first shell, and the distance between the second arc baffle plate and the first shell is the third gap width D3. A third arc baffle protrusion is fixedly provided on the first shell, and the third arc baffle protrusion is located below the second arc baffle plate. In addition, the third arc baffle protrusion extends from the N-pole static contact assembly toward the N-pole moving contact assembly, and the height of the third arc baffle protrusion protruding from the surface of the first shell toward the N-pole moving contact assembly is a third height H3, H3>D3; there is a fourth gap between the fourth arc baffle plate and the second shell, and the distance between the fourth arc baffle plate and the second shell is the width D4 of the fourth gap. A fourth arc baffle protrusion is fixedly provided on the side of the second shell facing the L-pole moving contact assembly, and the fourth arc baffle protrusion is located below the fourth arc baffle plate. In addition, the fourth arc baffle protrusion extends from the L-pole static contact assembly toward the L-pole moving contact assembly, and the height of the fourth arc baffle protruding from the surface of the second shell toward the L-pole moving contact assembly is a second height H4, H4>D4.

[0025] With the above solution, since the second arc-blocking plate is mounted on the N-pole contact support and moves with it, there are gaps on both sides of the second arc-blocking plate. Specifically, there is a gap between one side of the second arc-blocking plate and the first housing, and between the other side of the second arc-blocking plate and the partition plate. When the N-pole moving contact assembly opens, an arc is generated. Although the arc is largely blocked by the second arc-blocking plate, some charged particles still pass through the second arc-blocking plate, potentially burning the control mechanism above the second arc-blocking plate or causing a short circuit. Therefore, a third arc-blocking protrusion is fixedly mounted on the first housing, and H3>D3 is achieved. The third arc-blocking protrusion and the second arc-blocking plate together form a physical barrier, preventing the arc from escaping upward and burning the control mechanism above the second arc-blocking plate or causing a short circuit. Furthermore, the third arc-blocking protrusion increases the creepage distance along the insulating surface, thereby improving the insulation performance of the circuit breaker and reducing the risk of electrical breakdown. Similarly, there is a gap between one side of the fourth arc-blocking plate and the second housing, and between the other side of the fourth arc-blocking plate and the partition plate. When the L-pole moving contact assembly opens, an arc is generated. Although the arc is largely blocked by the fourth arc-blocking plate, some charged particles still pass through the sides of the fourth arc-blocking plate, causing arc burns or short circuits to the control mechanism above the fourth arc-blocking plate. Therefore, a fourth arc-blocking protrusion is fixedly provided on the second housing, and H3>D3 is achieved. The fourth arc-blocking protrusion and the fourth arc-blocking plate together form a physical barrier to prevent the arc from escaping upward and preventing the arc from burning the control mechanism above the fourth arc-blocking plate or causing a short circuit. The fourth arc-blocking protrusion can also increase the creepage distance along the insulating surface, thereby improving the insulation performance of the circuit breaker and reducing the risk of electrical breakdown.

[0026] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the assembly of the double-contact torsion spring, the N-pole moving contact assembly, and the L-pole moving contact assembly provided in an embodiment of the present application.

[0028] Figure 2 This is a schematic diagram of the assembly of the double-contact torsion spring, the N-pole moving contact assembly, and the L-pole moving contact assembly from another angle provided in an embodiment of the present application.

[0029] Figure 3 The second housing is removed from the circuit breaker provided in the embodiment of the present application, and a schematic diagram of the partition plate is shown.

[0030] Figure 4 for Figure 3 A schematic diagram showing the third arc-blocking protrusion in the first shell without the partition plate.

[0031] Figure 5 The first housing is removed from the circuit breaker provided in the embodiment of the present application, and a schematic diagram of the partition plate is shown.

[0032] Figure 6 for Figure 5 A schematic diagram showing the fourth arc-blocking protrusion in the second shell without the partition plate.

[0033] Description of reference numerals:

[0034] 11. First shell; 12. Second shell; 100. Double-contact torsion spring; 130. Connecting shaft; 111. First torsion spring; 112. Second torsion spring; 110. Connecting end; 121. First free end; 122. Second free end; 210. First slot; 200. Torsion spring support; 311. N-pole contact support; 312. L-pole contact support; 321. N-pole moving contact; 322. L-pole moving contact; 351. First connecting structure; 352. Second connecting structure; 342. L-pole static contact assembly; 341. N-pole static contact assembly; 410. First arc blocking plate; 331. Second arc blocking plate; 420. Third arc blocking plate; 332. Fourth arc blocking plate; 441. First arc blocking protrusion; 442. Second arc blocking protrusion; 443. Third arc blocking protrusion; 444. Fourth arc blocking protrusion. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0037] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists, A and B exist, and B exists. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0039] The directional terms appearing in the following description refer to the directions shown in the drawings and are not intended to limit the specific structure of the circuit breaker of this application. For example, in the description of this application, the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the device or component referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be understood as limiting this application.

[0040] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0041] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier, such as a fixed connection through screws, bolts, or other barrier; the physical connection may also be a detachable connection, such as a mutual snap connection or snap connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding, or integral molding. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] As a switch, a leakage circuit breaker can quickly cut off the power supply circuit when the leakage current in the power supply circuit exceeds a predetermined value, so as to avoid dangerous situations such as electric shock to people and equipment leakage.

[0044] A residual current circuit breaker (RCB) consists of a contact system, an operating mechanism, a trip unit, an arc extinguishing chamber, and a housing. The contact system typically includes moving and stationary contacts, which connect or disconnect the circuit within the circuit breaker. In a DPN miniature circuit breaker, the L-pole and N-pole contact systems are key components, working together to ensure circuit stability and safety. The L-pole represents the live wire, while the N-pole represents the neutral wire. The operating mechanism drives the contact system, enabling automatic or manual connection and disconnection of the circuit. The trip unit, also known as a releaser, is a device that detects abnormal conditions in the circuit (such as overload, short circuit, or undervoltage) and triggers the operating mechanism to disconnect the circuit. The arc extinguishing chamber extinguishes the arc generated when the circuit is disconnected, preventing damage to the contacts and the surrounding environment. The housing protects the internal components of the circuit breaker, preventing external factors (such as dust and moisture) from affecting its normal operation and providing a certain level of safety.

[0045] Some DPN miniature circuit breakers in related technologies are either unable to control the L-pole and N-pole contact pressures simultaneously, which results in unstable contact of the circuit breaker; and some DPN miniature circuit breakers use tension spring designs on both the L-pole contact and the N-pole contact to ensure the control of the L-pole and N-pole contact pressures. However, this design greatly increases the difficulty of assembly, increases production costs, and affects market competitiveness.

[0046] In view of this, an embodiment of the present application provides a circuit breaker and designs a double-contact torsion spring, which can not only stably control the L-pole and N-pole contact pressures at the same time, ensuring the safe use of household lines and electrical appliances, but also reduce assembly difficulty and improve production efficiency.

[0047] Figure 1 This is a schematic diagram of the assembly of the double-contact torsion spring 100 provided in this embodiment with the N-pole moving contact assembly and the L-pole moving contact assembly. Figure 2 This is a schematic diagram of another angle of assembly of the double-contact torsion spring 100 provided in this embodiment with the N-pole moving contact assembly and the L-pole moving contact assembly. Figure 1 and Figure 2 The circuit breaker provided in this application is a DPN miniature circuit breaker, which includes a housing, a connecting shaft 130 fixed on the housing, a double-contact torsion spring 100, and an N-pole moving contact assembly and an L-pole moving contact assembly.

[0048] The casing is used to provide mechanical support and protection for the internal components of the circuit breaker. The casing is made of insulating material to ensure user safety.

[0049] In this embodiment, the housing is composed of a first shell 11 and a second shell 12. The first shell 11 and the second shell 12 are symmetrically provided with slots for mounting a connecting shaft 130. The connecting shaft 130 is horizontally disposed between the first shell 11 and the second shell 12.

[0050] Please refer to Figure 1 The double-contact torsion spring 100 includes a first torsion spring 111 and a second torsion spring 112 connected to each other. The first torsion spring 111 and the second torsion spring 112 have the same rotation direction and are mounted side by side on the connecting shaft 130. The double-contact torsion spring 100 has a connecting end 110 and a free end. The connecting end 110 is the end where the first torsion spring 111 and the second torsion spring 112 are connected. The free end includes a first free end 121 of the first torsion spring 111 and a second free end 122 of the second torsion spring 112. The first free end 121 and the second free end 122 are not connected.

[0051] Please refer to Figure 3 、 Figure 4 and Figure 5 In this embodiment, the contact assembly includes an N-pole contact assembly and an L-pole contact assembly. The N-pole contact assembly includes an N-pole moving contact assembly and an N-pole static contact assembly 341 corresponding to the N-pole moving contact assembly, wherein the N-pole moving contact assembly is composed of an N-pole moving contact 321 and an N-pole contact support 311; the L-pole contact assembly includes an L-pole moving contact assembly and an L-pole static contact assembly 342 corresponding to the L-pole moving contact assembly, wherein the L-pole moving contact assembly is composed of an L-pole moving contact 322 and an L-pole contact support 312.

[0052] Please continue to refer to Figure 1 and Figure 2 The N-pole moving contact assembly is connected to the first free end 121; the L-pole moving contact assembly is connected to the second free end 122; the double-contact torsion spring 100 rotates, simultaneously driving the N-pole moving contact assembly and the L-pole moving contact assembly to move. Specifically, a first connecting structure 351 is provided on the side of the N-pole contact support 311 facing the first free end 121. The first connecting structure 351 engages with the first free end 121 to connect the N-pole moving contact assembly to the first free end 121. A second connecting structure 352 is provided on the side of the L-pole contact support 312 facing the second free end 122. The second connecting structure 352 engages with the second free end 122 to connect the L-pole moving contact assembly to the second free end 122.

[0053] Because the first torsion spring 111 and the second torsion spring 112 have the same rotation direction and are mounted side by side on the connecting shaft 130, the first torsion spring 111 and the second torsion spring 112 rotate in phase. When the free ends of the double-contact torsion spring 100 are connected to the N-pole moving contact assembly and the L-pole moving contact assembly, respectively, the double-contact torsion spring 100 can simultaneously drive the movement of the N-pole moving contact assembly and the L-pole moving contact assembly when rotating. In this way, a single double-contact torsion spring 100 can simultaneously control the contact pressure of the N-pole moving contact assembly and the L-pole moving contact assembly, ensuring the stability of the circuit breaker. Moreover, because the double-contact torsion spring 100 is an integrated design, it has fewer parts, facilitating assembly, improving manufacturing efficiency, and reducing manufacturing costs.

[0054] It can be understood that, at the moment when the operating mechanism of the circuit breaker is closed, it is necessary to ensure that the N-pole moving contact assembly is closed with the N-pole static contact assembly 341 first, and then the L-pole moving contact assembly is closed with the corresponding L-pole static contact assembly 342; at the moment when the operating mechanism of the circuit breaker is disconnected, it is necessary to ensure that the N-pole moving contact assembly is disconnected with the N-pole static contact assembly 341 first, and then the L-pole moving contact assembly is disconnected with the corresponding L-pole static contact assembly 342. The purpose of this design is to optimize the current flow and disconnection process, reduce the generation of arcs, and improve the breaking capacity of the circuit breaker.

[0055] In this embodiment, the distance between the N-pole static contact assembly 341 and the N-pole moving contact assembly is smaller than the distance between the L-pole static contact assembly 342 and the L-pole moving contact assembly. Specifically, the distance between the N-pole static contact assembly 341 and the N-pole moving contact 321 is smaller than the distance between the L-pole static contact assembly 342 and the L-pole moving contact 322.

[0056] In this embodiment, under the action of the double-contact torsion spring 100, the movement of the N-pole moving contact assembly and the L-pole moving contact assembly can be controlled simultaneously. Since the distance between the N-pole static contact assembly 341 and the N-pole moving contact assembly is smaller than the distance between the L-pole static contact assembly 342 and the L-pole moving contact assembly, the N-pole static contact assembly 341 and the N-pole moving contact assembly are first contacted and closed, and then the L-pole static contact assembly 342 and the L-pole moving contact assembly are contacted and closed, forming a circuit, thereby ensuring the breaking capacity of the circuit breaker.

[0057] Please refer to Figure 1 、 Figure 2 and Figure 3 In this embodiment, the circuit breaker further includes a torsion spring support 200. The torsion spring support 200 is provided with a first through-hole extending therethrough and a first retaining slot 210 located thereon. The connecting end 110 is retained within the first retaining slot 210. A first torsion spring 111 and a second torsion spring 112 are positioned on either side of the first through-hole. The connecting shaft 130 sequentially passes through the first torsion spring 111, the first through-hole, and the second torsion spring 112. The dual-contact torsion spring 100 is mounted within the housing via the torsion spring support 200. Because the torsion spring support 200 has the first retaining slot 210, the dual-contact torsion spring 100 can be secured to the torsion spring support 200 by retaining the connecting end 110 within the first retaining slot 210. Furthermore, the first through-hole allows the dual-contact torsion springs 100 to be mounted side by side in the same direction, enabling stable installation and precise control of the dual-contact torsion spring 100.

[0058] The opening size of the first slot 210 should be larger than the diameter of the connecting end 110 so that the connecting end 110 can be inserted into the first slot 210 .

[0059] The center diameter or median diameter of the first torsion spring 111 and the second torsion spring 112 should be larger than the axial diameter of the connecting shaft 130 to facilitate the connecting shaft 130 to pass through the first torsion spring 111 and the second torsion spring 112. Similarly, the diameter of the first through hole should also be larger than the axial diameter of the connecting shaft 130 to facilitate the connecting shaft 130 to pass through the first through hole smoothly, ensuring smooth installation.

[0060] It's understandable that the hole in the middle of a spring is often referred to as the spring's center diameter or mean coil diameter. This term describes the diameter of the coils in a coil spring at their center. The mean coil diameter is a crucial dimensional parameter that influences the spring's elastic properties and its performance within a mechanical system.

[0061] The N-pole moving contact assembly and the L-pole moving contact assembly are respectively arranged on both sides of the torsion spring support 200. When the torsion spring support 200 rotates around the connecting shaft 130, the N-pole moving contact assembly and the L-pole moving contact assembly are driven to move simultaneously.

[0062] Through the above solution, the N-pole moving contact assembly and the L-pole moving contact assembly are respectively arranged on both sides of the torsion spring support 200, so that when the torsion spring support 200 rotates around the connecting shaft 130 as the axis, the N-pole moving contact assembly and the L-pole moving contact assembly are driven to move simultaneously, thereby being able to simultaneously control the final pressure of the N-pole moving contact assembly and the L-pole moving contact assembly, which helps to improve the performance and reliability of the circuit breaker.

[0063] Figure 3 The second housing 12 is removed from the circuit breaker provided in this embodiment, and a schematic diagram of the partition plate is shown. Figure 4 for Figure 3 The partition plate is removed and a schematic diagram of the third arc blocking protrusion 443 in the first shell 11 is shown. Figure 5 The first housing 11 is removed from the circuit breaker provided in this embodiment, and a schematic diagram of the partition plate is shown. Figure 6 for Figure 5 The partition plate is removed and a schematic diagram of the fourth arc blocking protrusion 444 in the second housing 12 is shown.

[0064] Please refer to Figures 3 to 6 A first arc-blocking plate 410 is provided above the N-pole static contact assembly 341, and a corresponding second arc-blocking plate 331 is provided on the N-pole contact support 311. When the N-pole movable contact assembly moves toward the N-pole static contact assembly 341 and closes with the N-pole static contact assembly 341, the second arc-blocking plate 331 is located above or below the first arc-blocking plate 410. When the N-pole movable contact assembly moves away from the N-pole static contact assembly 341 and disconnects from the N-pole static contact assembly 341, the second arc-blocking plate 331 and the first arc-blocking plate 410 have an overlapping area.

[0065] It can be understood that the overlapping area between the second arc baffle 331 and the first arc baffle 410 mentioned above means that when the second arc baffle 331 is away from the first arc baffle 410, the second arc baffle 331 is not completely separated from the first arc baffle 410, so that there is no gap between the first arc baffle 410 and the second arc baffle 331 when viewed from above or above the first arc baffle 410 and the second arc baffle 331. When the arc spreads toward the first arc baffle 410 and the second arc baffle 331, the first arc baffle 410 and the second arc baffle 331 can block the arc from continuing to spread above the first arc baffle 410 and the second arc baffle 331, thereby preventing the operating mechanism above the first arc baffle 410 and the second arc baffle 331 from being burned by the arc, thereby ensuring a better arc blocking function.

[0066] It can be understood that the above in this embodiment refers to the above of the first arc baffle 410 and the second arc baffle 331 as viewed along the paper, based on the reference figure.

[0067] Similarly, in this embodiment, a third arc-blocking plate 420 is provided above the L-pole stationary contact assembly 342, and a corresponding fourth arc-blocking plate 332 is provided on the L-pole contact support 312. When the L-pole movable contact assembly moves toward and closes with the L-pole stationary contact assembly 342, the fourth arc-blocking plate 332 is located above or below the third arc-blocking plate 420. When the L-pole movable contact assembly moves away from and disconnects from the L-pole stationary contact assembly 342, the fourth arc-blocking plate 332 and the third arc-blocking plate 420 overlap.

[0068] Through the above solution, by providing arc shields above the N-pole and L-pole moving contact assemblies and their corresponding static contact assemblies, effective control and management of arcs during contact closing and opening is achieved. When the moving contact assembly and the static contact assembly disconnect, an arc is generated. Because a first arc shield 410 is provided above the N-pole static contact assembly 341, a second arc shield 331 is provided on the N-pole contact support 311, and a third arc shield 420 is provided above the L-pole static contact assembly 342, and a fourth arc shield 332 is provided on the L-pole contact support 312, the arc shielding surface formed by the combination of the first arc shield 410, the second arc shield 331, and the third arc shield 420, the second arc shield 331 can prevent the arc from moving upwards, thereby preventing damage to the operating mechanism.

[0069] In some embodiments, the first arc baffle 410, the second arc baffle 331, the third arc baffle 420, and the fourth arc baffle 332 are all curved plates. The curved arc baffle design helps improve creepage distance, as creepage distance is the shortest path along an insulating surface between two conductive components or between a conductive component and the protective interface of the equipment. Curved plates increase the path length along the surface, thereby improving insulation performance and reducing the likelihood of arcing. The shape and position of the first arc baffle 410, the second arc baffle 331, the third arc baffle 420, and the fourth arc baffle 332 effectively enhance the arc control capability of the circuit breaker, thereby improving its performance and reliability.

[0070] A separator plate is provided between the N-pole movable contact assembly and the N-pole stationary contact assembly 341 and the L-pole movable contact assembly and the L-pole stationary contact assembly 342. The separator plate helps to properly separate the N-pole and L-pole contact assemblies, allowing each to have its own independent space, reducing mutual interference and facilitating maintenance and replacement of the contact assemblies.

[0071] Because the housing is divided into a first shell 11 and a second shell 12, the first shell 11 and the partition plate form a first accommodating cavity, in which the N-pole movable contact assembly and the N-pole stationary contact assembly 341 are located. A second accommodating cavity is formed between the second shell 12 and the partition plate, in which the L-pole movable contact assembly and the L-pole stationary contact assembly 342 are located.

[0072] In order to ensure the arc blocking performance of the first arc blocking plate 410 and the third arc blocking plate 420, in this embodiment, the two sides of the first arc blocking plate 410 are respectively fixed on the partition plate facing the first accommodating cavity and the first shell 11; the two sides of the third arc blocking plate 420 are respectively fixed on the partition plate facing the second accommodating cavity and the second shell 12.

[0073] Through the above scheme, the two sides of the first arc baffle plate 410 are respectively fixed on the partition plate facing the first accommodating cavity and the first shell 11, so that there is no gap between the first arc baffle plate 410 and the first accommodating cavity and the partition plate, thereby achieving a better physical isolation effect and preventing the electric arc in the first accommodating cavity from escaping upward; similarly, the two sides of the third arc baffle plate 420 are respectively fixed on the partition plate facing the second accommodating cavity and the second shell 12, so that there is no gap between the third arc baffle plate 420 and the second shell 12 and the partition plate, thereby achieving a better physical isolation effect and preventing the electric arc in the second accommodating cavity from escaping upward.

[0074] Since the second arc baffle 331 is arranged on the N-pole contact support 311 and will move with the N-pole contact support 311, there are gaps on both sides of the second arc baffle 331, that is, there is a gap between one side of the second arc baffle 331 and the first shell 11, and there is a gap between the other side of the second arc baffle 331 and the partition plate. When the N-pole moving contact assembly is disconnected, an arc is generated. Although most of the arc is blocked by the second arc baffle 331, some charged particles will still pass through both sides of the second arc baffle 331, which will cause the control mechanism above the second arc baffle 331 to be burned by the arc or cause a short circuit. Similarly, there is a gap between one side of the fourth arc baffle plate 332 and the second shell 12, and there is a gap between the other side of the fourth arc baffle plate 332 and the partition plate. When the L-pole moving contact assembly is disconnected, an arc is generated. Although most of the arc is blocked by the fourth arc baffle plate 332, some charged particles will still pass through both sides of the fourth arc baffle plate 332, which will cause the control mechanism above the fourth arc baffle plate 332 to be burned by the arc or cause a short circuit.

[0075] In this case, in order to better block the arc, in this embodiment, there is a first gap between the second arc blocking plate 331 and the partition plate, and the distance between the second arc blocking plate 331 and the partition plate is the width D1 of the first gap. A first arc blocking protrusion 441 is fixedly provided on the side of the partition plate facing the N-pole moving contact assembly. The first arc blocking protrusion 441 is located below the second arc blocking plate 331, and the first arc blocking protrusion 441 extends from the N-pole static contact assembly 341 toward the N-pole moving contact assembly. The height of the first arc blocking protrusion 441 protruding from the surface of the partition plate toward the N-pole moving contact assembly is the first arc blocking protrusion 441. A height H1, H1>D1; there is a second gap between the fourth arc blocking plate 332 and the partition plate, and the distance between the fourth arc blocking plate 332 and the partition plate is the width D2 of the second gap. A second arc blocking protrusion 442 is fixedly provided on the side of the partition plate facing the L-pole moving contact assembly, and the second arc blocking protrusion 442 is located below the fourth arc blocking plate 332, and the second arc blocking protrusion 442 extends from the L-pole static contact assembly 342 toward the L-pole moving contact assembly. The height of the second arc blocking protrusion 442 protruding from the surface of the partition plate to the L-pole moving contact assembly is a second height H2, H2>D2. There is a third gap between the second arc blocking plate 331 and the first housing 11, and the distance between the second arc blocking plate 331 and the first housing 11 is a third gap width D3. A third arc blocking protrusion 443 is fixedly provided on the first housing 11, and the third arc blocking protrusion 443 is located below the second arc blocking plate 331. In addition, the third arc blocking protrusion 443 extends from the N-pole static contact assembly 341 toward the N-pole moving contact assembly. The height of the third arc blocking protrusion 443 from the surface of the first housing 11 to the N-pole moving contact assembly is a third height H3, H3>D3; the fourth arc blocking plate There is a fourth gap between 332 and the second shell 12, and the distance between the fourth arc blocking plate 332 and the second shell 12 is the width D4 of the fourth gap. A fourth arc blocking protrusion 444 is fixedly provided on the side of the second shell 12 facing the L-pole moving contact assembly. The fourth arc blocking protrusion 444 is located below the fourth arc blocking plate 332, and the fourth arc blocking protrusion 444 extends from the L-pole static contact assembly 342 toward the L-pole moving contact assembly. The height of the fourth arc blocking protrusion 444 protruding from the surface of the second shell 12 to the L-pole moving contact assembly is a second height H4, H4>D4.

[0076] Through the above solution, the design of the first arc-blocking protrusion 441 helps to more effectively guide and control the arc generated when the N-pole moving contact 321 opens, preventing it from escaping upward and burning conductive components, and reducing arc damage to the contacts and surrounding components. H1>D1 further ensures that the first arc-blocking protrusion 441 and the separator plate have an overlapping area, eliminating any direct gap between them, thus preventing the arc from escaping directly upward. The design of the second arc-blocking protrusion 442 helps to more effectively guide and control the arc generated when the L-pole moving contact 322 opens, preventing it from escaping upward and burning conductive components, and reducing arc damage to the contacts and surrounding components. H2>D2 further ensures that the second arc-blocking protrusion 442 and the separator plate have an overlapping area, eliminating any direct gap between them, thus preventing the arc from escaping directly upward. Furthermore, the modular design of the separator plate and arc-blocking protrusions allows for easier access and replacement of relevant components when maintenance or upgrades are required, improving maintenance convenience.

[0077] A third arc-blocking protrusion 443 is fixedly provided on the first shell 11, and H3>D3 is made. The third arc-blocking protrusion 443 and the second arc-blocking plate 331 together form a physical isolation to prevent the arc from escaping upward, and prevent the arc from burning the control mechanism above the second arc-blocking plate 331 or causing a short circuit. In addition, the third arc-blocking protrusion 443 can increase the creepage distance along the insulating surface, thereby improving the insulation performance of the circuit breaker and reducing the risk of electrical breakdown. A fourth arc-blocking protrusion 444 is fixedly provided on the second shell 12, and H4>D4 is made. The fourth arc-blocking protrusion 444 and the fourth arc-blocking plate 332 together form a physical isolation to prevent the arc from escaping upward, and prevent the arc from burning the control mechanism above the fourth arc-blocking plate 332 or causing a short circuit. In addition, the fourth arc-blocking protrusion 444 can increase the creepage distance along the insulating surface, thereby improving the insulation performance of the circuit breaker and reducing the risk of electrical breakdown.

[0078] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A circuit breaker, characterized in that: include: shell; a connecting shaft fixed to the housing; a double-contact torsion spring, the double-contact torsion spring comprising a first torsion spring and a second torsion spring connected to each other, the first torsion spring and the second torsion spring having the same rotation direction and being mounted side by side on the connecting shaft; The double-contact torsion spring has a connecting end and a free end, the connecting end is an end where the first torsion spring and the second torsion spring are connected, the free end includes a first free end of the first torsion spring and a second free end of the second torsion spring, and the first free end and the second free end are not connected; It also includes an N-pole moving contact assembly and an L-pole moving contact assembly, the N-pole moving contact assembly is connected to the first free end; the L-pole moving contact assembly is connected to the second free end; the double-contact torsion spring rotates, simultaneously driving the N-pole moving contact assembly and the L-pole moving contact assembly to move.

2. The circuit breaker according to claim 1, wherein: It also includes an N-pole static contact assembly corresponding to the N-pole moving contact assembly and an L-pole static contact assembly corresponding to the L-pole moving contact assembly, and the distance between the N-pole static contact assembly and the N-pole moving contact assembly is smaller than the distance between the L-pole static contact assembly and the L-pole moving contact assembly.

3. The circuit breaker according to claim 1, wherein: It also includes a torsion spring support, which is provided with a first through hole passing through the torsion spring support and a first slot located on the torsion spring support, the connecting end is clamped in the first slot, the first torsion spring and the second torsion spring are respectively on both sides of the first through hole, and the connecting shaft passes through the first torsion spring, the first through hole and the second torsion spring in sequence.

4. The circuit breaker according to claim 3, characterized in that The N-pole moving contact assembly and the L-pole moving contact assembly are respectively arranged on both sides of the torsion spring support. When the torsion spring support rotates with the connecting shaft as the axis, the N-pole moving contact assembly and the L-pole moving contact assembly are driven to move simultaneously.

5. The circuit breaker according to claim 4, characterized in that The N-pole moving contact assembly includes an N-pole moving contact and an N-pole contact support; the L-pole moving contact assembly includes an L-pole moving contact and an L-pole contact support; a first connecting structure is provided on the side of the N-pole contact support facing the first free end, and the first connecting structure is clamped with the first free end; a second connecting structure is provided on the side of the L-pole contact support facing the second free end, and the second connecting structure is clamped with the second free end.

6. The circuit breaker according to claim 5, characterized in that The invention also includes an N-pole static contact assembly and an L-pole static contact assembly fixed in the housing, wherein the N-pole static contact assembly corresponds to the N-pole moving contact assembly, and the L-pole static contact assembly corresponds to the L-pole moving contact assembly. A first arc baffle is provided above the N-pole static contact assembly, and a second arc baffle is provided on the N-pole contact support correspondingly; a third arc baffle is provided above the L-pole static contact assembly, and a fourth arc baffle is provided on the L-pole contact support correspondingly; When the N-pole moving contact assembly moves toward the N-pole static contact assembly and closes with the N-pole static contact assembly, the second arc baffle is located above or below the first arc baffle; when the N-pole moving contact assembly moves away from the N-pole static contact assembly and disconnects from the N-pole static contact assembly, the second arc baffle and the first arc baffle have an overlapping area; When the L-pole moving contact assembly moves toward the L-pole static contact assembly and closes with the L-pole static contact assembly, the fourth arc baffle is located above or below the third arc baffle; when the L-pole moving contact assembly moves away from the L-pole static contact assembly and is disconnected from the L-pole static contact assembly, the fourth arc baffle and the third arc baffle have an overlapping area.

7. The circuit breaker according to claim 6, characterized in that The first arc baffle plate, the second arc baffle plate, the third arc baffle plate and the fourth arc baffle plate are all arc-shaped plates.

8. The circuit breaker according to claim 7, characterized in that A partition plate is provided between the N-pole moving contact assembly, the N-pole static contact assembly and the L-pole moving contact assembly, the L-pole static contact assembly; A first gap is defined between the second arc blocking plate and the partition plate, the distance between the second arc blocking plate and the partition plate being the width D1 of the first gap; a first arc blocking protrusion is fixedly provided on a side of the partition plate facing the N-pole moving contact assembly, the first arc blocking protrusion is located below the second arc blocking plate, and the first arc blocking protrusion extends from the N-pole static contact assembly toward the N-pole moving contact assembly; a height of the first arc blocking protrusion from the surface of the partition plate toward the N-pole moving contact assembly is a first height H1, and H1>D1; There is a second gap between the fourth arc blocking plate and the partition plate, and the distance between the fourth arc blocking plate and the partition plate is the width D2 of the second gap. A second arc blocking protrusion is fixedly provided on the side of the partition plate facing the L-pole moving contact assembly, and the second arc blocking protrusion is located below the fourth arc blocking plate, and the second arc blocking protrusion extends from the L-pole static contact assembly toward the L-pole moving contact assembly. The height of the second arc blocking protrusion from the surface of the partition plate to the L-pole moving contact assembly is a second height H2, and H2>D2.

9. The circuit breaker according to claim 8, characterized in that The housing is divided into a first shell and a second shell, the first shell and the partition plate form a first accommodating cavity, the N-pole moving contact assembly and the N-pole static contact assembly are located in the first accommodating cavity, and a second accommodating cavity is formed between the second shell and the partition plate, the L-pole moving contact assembly and the L-pole static contact assembly are located in the second accommodating cavity; Two sides of the first arc baffle are respectively fixed on the partition plate facing the first accommodating cavity and the first shell; Two sides of the third arc baffle are respectively fixed on the partition plate and the second shell facing the second accommodating cavity.

10. The circuit breaker according to claim 9, characterized in that A third gap is defined between the second arc blocking plate and the first housing, and a distance between the second arc blocking plate and the first housing is the third gap width D3. A third arc blocking protrusion is fixedly provided on the first housing, and the third arc blocking protrusion is located below the second arc blocking plate. The third arc blocking protrusion extends from the N-pole static contact assembly toward the N-pole moving contact assembly, and a height of the third arc blocking protrusion from the surface of the first housing to the N-pole moving contact assembly is a third height H3, where H3>D3. There is a fourth gap between the fourth arc baffle plate and the second shell, and the distance between the fourth arc baffle plate and the second shell is the width D4 of the fourth gap. A fourth arc-blocking protrusion is fixedly provided on the side of the second shell facing the L-pole moving contact assembly, and the fourth arc-blocking protrusion is located below the fourth arc baffle plate. In addition, the fourth arc-blocking protrusion extends from the L-pole static contact assembly toward the L-pole moving contact assembly. The height of the fourth arc-blocking protrusion protruding from the surface of the second shell to the L-pole moving contact assembly is a second height H4, and H4>D4.

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