Moving contact assembly and circuit breaker

Abstract

The embodiment of the utility model provides a moving contact assembly and a circuit breaker, and relates to the field of electrical equipment. The moving contact assembly comprises a base, a moving contact, a main shaft and a limiting piece. The moving contact is used for being opposite to the static contact, the main shaft is rotatably arranged on the base, and the main shaft is connected with the moving contact, so that the main shaft can drive the moving contact to be close to or away from the static contact through rotation. The limiting piece is connected to the base and can abut against the circumferential face of the main shaft in the radial direction of the main shaft. According to the moving contact assembly and the circuit breaker, the moving contact is driven by the main shaft, the main shaft can rotate within a set rotation range under the limitation of the limiting piece, the influence of machining errors and assembling errors on the movable stroke of the moving contact is reduced, the moving contact has enough movable stroke, and the contact reliability of the moving contact and the static contact is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electrical equipment, and specifically to a moving contact assembly and a circuit breaker. Background Art

[0002] In the power system, the circuit breaker is a vital electrical equipment. Its main function is to quickly cut off the current circuit when faults such as overload and short circuit occur in the current circuit to protect the safe and stable operation of the power system.

[0003] A circuit breaker consists of a movable moving contact and a stationary stationary contact. When the moving contact approaches and contacts the stationary contact, the circuit breaker closes, connecting the current circuit. When the moving contact moves away from the stationary contact, the circuit breaker opens, interrupting the current circuit. The moving contact is typically designed with an overtravel mechanism, allowing it to move closer to the stationary contact during closing, pressing against the stationary contact and ensuring reliable contact between the two contacts.

[0004] However, in existing circuit breakers, the actuators that drive the moving contacts often have manufacturing and assembly errors. These errors are particularly pronounced in larger circuit breakers, easily affecting the movable travel of the moving contacts, resulting in insufficient travel and unreliable contact between the moving and stationary contacts. Therefore, improving the reliability of contact between the moving and stationary contacts has become a technical issue that needs to be addressed. Utility Model Content

[0005] In view of the above problems, an embodiment of the present application provides a moving contact assembly, which drives the moving contact toward or away from the static contact through the rotation of the main shaft. The limiter presses against the circumferential surface of the main shaft in the radial direction of the main shaft, thereby limiting the rotational space of the main shaft. Even if the main shaft has machining errors and assembly errors, the main shaft will rotate within a predetermined rotation range under the restriction of the limiter, making the rotation trajectory of the main shaft more controllable, reducing the impact of machining errors and assembly errors on the movable stroke of the moving contact, ensuring that the moving contact has sufficient movable stroke, and improving the reliability of the contact between the moving contact and the static contact. The embodiment of the present application also provides a circuit breaker including the moving contact assembly.

[0006] One aspect of an embodiment of the present application provides a moving contact assembly for use in a circuit breaker. The moving contact assembly includes a base, a moving contact, a main shaft, and a stopper. The moving contact is configured to oppose a stationary contact. The main shaft is rotatably mounted on the base and connected to the moving contact, enabling the main shaft to rotate to drive the moving contact toward or away from the stationary contact. The stopper is connected to the base and is configured to abut against the circumferential surface of the main shaft in a radial direction.

[0007] In this moving contact assembly, the stopper can abut against the circumferential surface of the main shaft in the radial direction of the main shaft, limiting the rotation range of the main shaft. Even if the main shaft has machining errors and assembly errors, the stopper can ensure that the main shaft rotates within the predetermined rotation range, and the position where the main shaft and the moving contact are connected will not produce excessive positional deviation, and the moving contact will not be deflected by the main shaft, thereby ensuring that the moving contact has sufficient movable travel. In addition, when the stopper abuts against the circumferential surface of the main shaft, it will provide a certain amount of pressing force to the main shaft. Even if the moving contact and the static contact are subjected to currents such as short-time withstand current and short-time delay current when in contact, they are not easily separated, further improving the reliability of the contact between the moving contact and the static contact.

[0008] In an optional embodiment, the limiting member is provided with a socket, and a bearing is provided at the socket. The outer circumferential surface of the bearing can abut against the circumferential surface of the main shaft to abut against the circumferential surface of the main shaft in the radial direction of the main shaft.

[0009] In this method, the bearing is positioned within the socket, facilitating proper alignment of the spindle and bearing. The spindle is radially constrained by the bearing as it rotates within the socket, ensuring it remains within the intended rotational range. Furthermore, when the bearing rests against the spindle, it does not obstruct its rotation.

[0010] In an optional embodiment, the bearing includes a first bearing and a second bearing. A gap is provided between the first bearing and the second bearing, and both the first bearing and the second bearing can abut against the circumferential surface of the main shaft in the radial direction of the main shaft.

[0011] In this manner, both the first bearing and the second bearing can bear against the main shaft in the radial direction of the main shaft, which more comprehensively limits the rotatable range of the main shaft and can further ensure that the moving contact has sufficient movable stroke, so that the moving contact can more reliably contact the static contact.

[0012] In an optional embodiment, the limiting member includes a mounting plate, the sleeve is arranged on the mounting plate, the first bearing and the second bearing are arranged on the same side of the mounting plate, or the first bearing and the second bearing are respectively arranged on opposite sides of the mounting plate.

[0013] In this manner, the socket, the first bearing and the second bearing are arranged on the mounting plate, the overall structure of the limiting member is simple, easy to process and install, and has low cost.

[0014] In an optional manner, the limiting member further includes a mounting plate. The socket is a through hole provided on the mounting plate, or the socket is a groove provided at an edge of the mounting plate.

[0015] When the socket is set as a through hole or a groove, it is convenient for positioning processing, and it is also convenient for the socket and the main shaft to be connected with each other, and installation and disassembly are also more convenient.

[0016] In one optional embodiment, the movable contact assembly further includes an elastic member connected between the main shaft and the limiting member, and the elastic member is capable of deforming when the main shaft rotates in a first rotational direction. When the main shaft rotates in the first rotational direction, the movable contact approaches the stationary contact.

[0017] In this manner, the elastic member can assist in opening the circuit breaker, making the opening process faster and the current circuit breaker more efficient.

[0018] In an optional embodiment, the elastic member is a tension spring. A first cantilever is provided on the position limiting member, a second cantilever is provided on the circumferential surface of the main shaft, and two ends of the tension spring are respectively connected to the first cantilever and the second cantilever.

[0019] In this method, the elastic member is a tension spring, and the tension springs are respectively connected to the first cantilever and the second cantilever, resulting in a simple overall structure and easy assembly. In addition, the deformation mode of the tension spring is extension and rebound, which is highly controllable and easy to replace.

[0020] In an optional manner, a plurality of limiting members are arranged in the axial direction of the main shaft, and each limiting member can abut against the circumferential surface of the main shaft in the radial direction of the main shaft.

[0021] This method limits the rotation range of different shaft sections of the main shaft through multiple limiters, which can eliminate the influence of machining errors of different shaft sections of the main shaft on the movable stroke of the moving contact, making the contact between the moving contact and the static contact more reliable.

[0022] In an optional manner, there are multiple moving contacts, and the main shaft is connected to each moving contact through multiple connecting parts to drive each moving contact to move synchronously.

[0023] In this mode, the main shaft can control the synchronous movement of multiple moving contacts at the same time, thereby controlling the on and off of multiple current circuits at the same time. It is suitable for the main switch control of multiple current circuits and is easier to operate.

[0024] Another aspect of the present invention provides a circuit breaker comprising a static contact and any one of the aforementioned moving contact assemblies, wherein the moving contact and the static contact in the moving contact assembly are opposite to each other and the moving contact can move closer to or farther from the static contact as the main shaft rotates.

[0025] In this circuit breaker, the moving contact approaches or moves away from the static contact as the main shaft rotates, and the limiter can abut against the circumferential surface of the main shaft in the radial direction of the main shaft, thereby limiting the rotatable space of the main shaft. Even if there are machining errors and assembly errors in the main shaft, the main shaft will rotate within the predetermined movable space under the restriction of the limiter. The movable stroke of the moving contact is not affected by the machining errors and assembly errors of the main shaft. When closing the circuit, the moving contact can easily generate sufficient overtravel to press on the static contact, thereby improving the reliability of the circuit breaker.

[0026] In the movable contact assembly and circuit breaker provided in the embodiments of the present application, the movable contact is driven toward or away from the stationary contact by the rotation of the main shaft, and the limiter abuts the circumferential surface of the main shaft in the radial direction of the main shaft, thereby limiting the rotation range of the main shaft and preventing the circumferential surface of the main shaft from excessively jumping during rotation. In this way, even if there are machining errors and assembly errors in the main shaft, the main shaft will rotate within a predetermined movable space under the restriction of the limiter, making the rotation trajectory of the main shaft more controllable, reducing the impact of machining errors and assembly errors on the movable stroke of the movable contact, and ensuring that the movable contact has sufficient movable stroke. When closing the circuit breaker, the movable contact easily generates sufficient overtravel to press on the stationary contact, thereby improving the contact reliability between the movable contact and the stationary contact. In addition, when the limiter abuts the circumferential surface of the main shaft, it provides a certain pressing force on the main shaft. Even if the movable contact and the stationary contact are subjected to currents such as short-time withstand current and short-time delay current when in contact, they are not easily separated, thereby further improving the contact reliability between the movable contact and the stationary contact. In addition, the movable contact assembly has a simple structure, is easy to assemble and has a low cost.

[0027] The above description is only an overview of the technical solutions of the embodiments of this application. In order to more clearly understand the technical means of the embodiments of this application, you can implement them according to the contents of the description. In order to make the above and other purposes, features and advantages of the embodiments of this application more obvious and easy to understand, the following specifically describes the specific implementation methods of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A schematic structural diagram of a moving contact assembly provided in an embodiment of the present application at a first viewing angle.

[0030] Figure 2 This is a schematic structural diagram of the moving contact assembly involved in an embodiment of the present application at a second viewing angle.

[0031] Figure 3 This is a schematic structural diagram of the moving contact assembly involved in an embodiment of the present application from a third perspective.

[0032] Figure 4 This is a structural schematic diagram of the first bearing and the second bearing on the limit member involved in an embodiment of the present application being located on the same side of the mounting plate.

[0033] Figure 5 This is a structural schematic diagram of the first bearing and the second bearing of the limit member involved in an embodiment of the present application being located on opposite sides of a mounting plate.

[0034] Figure 6 This is a structural schematic diagram of a first cantilever provided on the limiting member involved in an embodiment of the present application.

[0035] Reference numerals:

[0036] 10. Base; 20. Moving contact; 30. Main shaft; 31. Connecting piece; 32. Second cantilever; 40. Limiting piece; 41. Socket; 42. Bearing; 421. First bearing; 422. Second bearing; 43. Mounting plate; 44. First cantilever; 50. Elastic piece; 60. Power piece. DETAILED DESCRIPTION

[0037] 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 accompanying 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.

[0038] 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 herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] The terms "comprises", "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0040] 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.

[0041] 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 alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0042] The directional words appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the movable contact assembly and circuit breaker of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present application.

[0043] In addition, the expressions of the indicated directions such as the X direction, the Y direction, and the Z direction used to illustrate the operation and construction of the movable contact assembly and the components of the circuit breaker of this embodiment are not absolute but relative, and although these indications are appropriate when the movable contact assembly and the components of the circuit breaker are in the positions shown in the figures, when these positions are changed, these directions should be interpreted differently to correspond to the changes.

[0044] 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.

[0045] 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).

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a fixing member, such as a screw, bolt, or other fixing member. A physical connection can also be a detachable connection, such as a mutual snap-fit ​​connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. In addition to referring to a physical connection, "connected" or "connected" in a circuit structure can also refer to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is interconnected. It can also refer to internal communication between two elements. A signal connection can refer to a signal connection through a circuit or a signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0047] The movable contact assembly provided in the embodiment of the present application is applied to a circuit breaker, such as Figure 1 、 Figure 2 and Figure 3 As shown, Figure 1 This is a structural diagram of a moving contact assembly provided in an embodiment of the present application at a first viewing angle. Figure 2 : is a structural diagram of the moving contact assembly involved in an embodiment of the present application at a second viewing angle, Figure 3 1 is a schematic structural diagram of a movable contact assembly according to an embodiment of the present application from a third viewing angle, wherein the movable contact assembly includes a base 10 , a movable contact 20 , a main shaft 30 and a stopper 40 .

[0048] The base 10 is the frame structure of the movable contact assembly and can be either part of the circuit breaker frame or a separate frame structure. It provides mounting space and location for components such as the movable contact 20, spindle 30, and stopper 40. Holes, slots, and bosses can be incorporated into the base 10 to facilitate the positioning and installation of these components.

[0049] The moving contact 20 and the stationary contact are conductive structures arranged in pairs, and the moving contact 20 and the stationary contact are arranged relative to each other in space. The stationary contact is a contact structure in a stationary state. The moving contact 20 is movably arranged on the base 10 and can move closer to or further away from the stationary contact. The moving contact 20 and the stationary contact respectively form the moving contact and stationary contact of the current loop. When the moving contact 20 approaches the stationary contact and contacts the stationary contact, the circuit breaker is closed and the current loop is connected. When the moving contact 20 moves away from the stationary contact and separates from the stationary contact, the circuit breaker is opened and the current loop is disconnected.

[0050] The movable contact 20 can be in many structural forms, for example, the movable contact 20 can be configured as a sheet, a column, etc. The movable contact 20 can be slidably disposed on the base 10 or rotatably disposed on the base 10, thereby approaching or moving away from the static contact by sliding or rotating.

[0051] In this embodiment, the main shaft 30 is a driving member that drives the movable contact 20 toward or away from the stationary contact. The main shaft 30 is rotatably disposed on the base 10 and is connected to the movable contact 20, so that the main shaft 30 can drive the movable contact 20 toward or away from the stationary contact by rotating.

[0052] The spindle 30 can be constructed in a variety of ways. For example, the spindle 30 can be a simple cylindrical shaft or a shaped shaft with varying axial diameters, without limitation. Furthermore, the outer periphery of the spindle 30 can be provided with a toothed structure, cantilever, cam, or other structure to facilitate connection between the spindle 30 and other components.

[0053] The main shaft 30 can be connected to the moving contact 20 via a connector 31 to facilitate power transmission. For example, the main shaft 30 can be connected to the moving contact 20 via a connector 31 such as a connecting rod or a cam, so that the moving contact 20 can sense the rotation of the main shaft 30 and move closer to or away from the static contact.

[0054] In this embodiment, the main shaft 30 is rotatable about its axis, and its rotation direction includes a first rotation direction and a second rotation direction, wherein the first rotation direction and the second rotation direction are opposite to each other. For example, when the first rotation direction is clockwise, the second rotation direction is counterclockwise, which is opposite to the clockwise direction. When the main shaft 30 rotates in the first rotation direction, the moving contact 20 moves closer to the stationary contact. In other words, the first rotation direction is the rotation direction for closing the circuit breaker. When the main shaft 30 rotates in the second rotation direction, the moving contact 20 moves away from the stationary contact. In other words, the second rotation direction is the rotation direction for opening the circuit breaker.

[0055] The limiter 40 is connected to the base 10, and can be connected to the base 10 by means of threaded connection, riveting, welding, etc. The limiter 40 can abut against the circumference of the main shaft 30 in the radial direction of the main shaft 30. Therefore, when the main shaft 30 rotates, the outer contour of the main shaft 30 is restricted by the limiter 40. That is, the circumference of the main shaft 30 is always abutted by the limiter 40 during rotation, thereby limiting the rotation range of the main shaft 30. Even if the main shaft 30 has machining and assembly errors, the limiter 40 can ensure that the main shaft 30 rotates within the predetermined rotation range. The main shaft 30 will not experience excessive radial runout during rotation, and the position where the main shaft 30 is connected to the movable contact 20 will not experience excessive positional deviation. The movable contact 20 will not be deviated by the main shaft 30, thereby ensuring that the movable contact 20 has sufficient movable travel. When closing the circuit breaker, the movable contact 20 can easily produce sufficient overtravel to press on the static contact, thereby improving the reliability of the contact between the movable contact 20 and the static contact.

[0056] Furthermore, when the stopper 40 abuts the circumferential surface of the main shaft 30, it provides a certain amount of compressive force on the main shaft 30. Even if the movable contact 20 and the static contact are subjected to currents such as short-time withstand current and short-time delay current during contact, they are unlikely to separate, thereby further improving the reliability of the contact between the movable contact 20 and the static contact. In addition, in this movable contact assembly, the movable contact 20 is driven by the main shaft 30, and the stopper 40 limits the rotation range of the main shaft 30. The structure is simple, easy to assemble, and low in cost.

[0057] In this embodiment, the limiting member 40 can be radially opposed to the main shaft 30 via an interference structure. A small initial installation gap can be provided between the interference structure and the main shaft 30, so that the interference structure only contacts the main shaft 30 when the main shaft 30 is rotating, thereby limiting the rotation of the main shaft 30. Alternatively, the interference structure can be provided without an initial installation gap, so that the interference structure always contacts the main shaft 30. Whether an initial installation gap is provided between the interference structure and the main shaft 30 depends on specific needs and is not limited here.

[0058] The interference structure can be a protruding structure such as a boss provided on the stopper 40, and the boss can be a circular boss so that the circular boss abuts the main shaft 30 in a tangential manner, reducing friction between the two. The interference structure can also be a bearing 42 provided on the stopper 40, with the outer circumferential surface of the bearing 42, that is, the circumferential surface of the outer ring of the bearing 42 abutting the main shaft 30 in a tangential manner to further reduce friction, thereby providing radial limitation for the main shaft 30 while reducing the obstruction to the rotation of the main shaft 30. In addition, a bearing 42 can also be provided on the main shaft 30, and the bearing 42 and the interference structure abut each other, which can also reduce friction and reduce the obstruction of the interference structure to the rotation of the main shaft 30.

[0059] For example, a feasible implementation method is as follows Figure 1 and Figure 4 As shown, Figure 4 This is a schematic diagram of a structure in which the first and second bearings of a position-limiting member according to an embodiment of the present application are located on the same side of a mounting plate. The position-limiting member 40 is provided with a socket 41, which is provided with a bearing 42. The outer circumferential surface of the bearing 42 is capable of abutting against the circumferential surface of the spindle 30, thereby supporting the circumferential surface of the spindle 30 in its radial direction.

[0060] The socket 41 is an opening through which the spindle 30 passes, creating space for the spindle 30 to rotate. Furthermore, a bearing 42 is positioned within the socket 41, that is, adjacent to the socket 41. Once the stopper 40 is installed, the bearing 42 is positioned opposite the spindle 30, bringing them into close proximity or abutting each other, thereby limiting the rotational space of the spindle 30.

[0061] The outer circumferential surface of the bearing 42 abuts against the circumferential surface of the main shaft 30 in a tangential manner, and the axial direction of the bearing 42 can be made parallel to the axial direction of the main shaft 30, so that when the outer circumferential surface of the bearing 42 abuts against the circumferential surface of the main shaft 30, the main shaft 30 can also rotate freely, avoiding the bearing 42 from hindering the rotation of the main shaft 30.

[0062] In this configuration, bearing 42 is positioned within socket 41, facilitating alignment of the spindle 30 with bearing 42. When the spindle 30 rotates within socket 41, it is radially constrained by bearing 42, ensuring that it remains within a predetermined rotational range. Furthermore, when bearing 42 abuts against the spindle 30, it does not hinder its rotation.

[0063] In this method, the bearing 42 can be set as one or more. Figure 4 As shown, the bearing 42 includes a first bearing 421 and a second bearing 422. There is a gap between the first bearing 421 and the second bearing 422. The first bearing 421 and the second bearing 422 can both abut against the circumferential surface of the main shaft 30 in the radial direction of the main shaft 30.

[0064] When the first bearing 421 and the second bearing 422 are provided, the first bearing 421 and the second bearing 422 limit the main shaft 30 at different positions, thereby further limiting the rotation range of the main shaft 30 and further ensuring that the moving contact 20 has sufficient movable stroke.

[0065] The first bearing 421 and the second bearing 422 can simultaneously abut the main shaft 30, or the first bearing 421 and the second bearing 422 can separately abut the main shaft 30 under different circumstances. For example, the first bearing 421 and the second bearing 422 can be arranged along the circumference of the main shaft 30, and the first bearing 421 can abut the main shaft 30 when the main shaft 30 rotates in a first rotational direction, and the second bearing 422 can abut the main shaft 30 when the main shaft 30 rotates in a second rotational direction. As a result, the main shaft 30 can be restricted by the bearings 42 during both closing and opening, further ensuring that the moving contact 20 has sufficient movable travel.

[0066] In this manner, both the first bearing 421 and the second bearing 422 can press against the main shaft 30 in the radial direction of the main shaft 30, which more comprehensively limits the rotatable range of the main shaft 30 and can further ensure that the moving contact 20 has sufficient movable stroke, so that the moving contact 20 can more reliably contact the static contact.

[0067] There are many specific ways to set the first bearing 421 and the second bearing 422. One optional way is as follows Figure 4 and Figure 5 As shown, Figure 5 This is a schematic diagram of a structure in which the first and second bearings of a position limiting member according to an embodiment of the present application are located on opposite sides of a mounting plate. The position limiting member 40 includes a mounting plate 43, on which a socket 41 is disposed. The first and second bearings 421, 422 are disposed on the same side of the mounting plate 43, or alternatively, the first and second bearings 421, 422 are disposed on opposite sides of the mounting plate 43.

[0068] The mounting plate 43 serves as the frame structure of the position-limiting member 40 and is connected to the base 10 to secure the position-limiting member 40 to the base 10. The socket 41 and the bearings 42 are both mounted on the mounting plate 43. The first bearing 421 and the second bearing 422 can be mounted on the mounting plate 43 by riveting, snapping, or other means. The opening direction of the socket 41, the axis of the first bearing 421, and the axis of the second bearing 422 can all be perpendicular to the surface of the mounting plate 43, facilitating the alignment of the position-limiting member 40 and the spindle 30.

[0069] The axis of the first bearing 421 and the second bearing 422 can be arranged on the same side of the mounting plate 43, or on different sides of the mounting plate 43. When the first bearing 421 and the second bearing 422 are arranged on the same side of the mounting plate 43, as shown in FIG. Figure 4 As shown, a gap is provided between the first bearing 421 and the second bearing 422 so that the outer ring of the first bearing 421 and the outer ring of the second bearing 422 can rotate freely respectively, thereby preventing the bearings 42 from hindering the rotation of the main shaft 30.

[0070] When the first bearing 421 and the second bearing 422 are respectively arranged on opposite sides of the mounting plate 43, as shown in FIG. Figure 5 As shown, the first bearing 421 and the second bearing 422 are separated by the mounting plate 43, and their outer rings can rotate freely. The axes of the first bearing 421 and the second bearing 422 are parallel to each other, and the distance between the axes of the first bearing 421 and the second bearing 422 can be freely adjusted, as long as the first bearing 421 and the second bearing 422 can reliably limit the rotation range of the main shaft 30.

[0071] In this embodiment, the socket 41 , the first bearing 421 and the second bearing 422 are arranged on the mounting plate 43 . The overall structure of the position limiting member 40 is simple, easy to manufacture and install, and has low cost.

[0072] In addition, there are many ways to set the socket 41. For example, when the socket 41 is set on the mounting plate 43, the socket 41 can be a through hole set on the mounting plate 43, or it can be as shown in FIG. Figure 4 As shown, the socket 41 is a groove provided at the edge of the mounting plate 43 .

[0073] When the socket 41 is configured as a through hole or a groove, it is convenient for positioning and processing, and it is also convenient for the socket 41 and the main shaft 30 to be connected to each other, and installation and disassembly are also more convenient.

[0074] In this embodiment, the main shaft 30 is connected to a power member 60 to rotate under the power of the power member 60. The power member 60 can be a manually operated mechanism, such as a crank mechanism. The power member 60 can also be an electric drive device to drive the main shaft 30 to rotate in the first rotation direction or the second rotation direction through electronic control.

[0075] In a specific embodiment, the power member 60 drives the main shaft 30 to rotate in a first rotational direction during closing, thereby driving the movable contact 20 toward and into contact with the static contact. During opening, the power member 60 drives the main shaft 30 to rotate in a second rotational direction, thereby driving the movable contact 20 away from and separating from the static contact.

[0076] In this embodiment, in order to make the opening more rapid, an elastic member 50 can be provided between the main shaft 30 and the limit member 40 to assist the opening. Figure 1 and Figure 6 As shown, Figure 6 This is a schematic diagram of a structure in which a first cantilever is provided on a stopper according to an embodiment of the present application. The movable contact assembly further includes an elastic member 50. The elastic member 50 is connected between the main shaft 30 and the stopper 40 and is capable of deforming when the main shaft 30 rotates in a first rotational direction. When the main shaft 30 rotates in the first rotational direction, the movable contact 20 approaches the stationary contact.

[0077] When the circuit breaker is closed, the main shaft 30 rotates in the first direction, causing the elastic member 50 to deform and accumulate a restoring force. When the circuit breaker is opened, the main shaft 30 rotates in the second direction under the action of the power member 60. The elastic member 50 rebounds accordingly, releasing the restoring force. Simultaneously driven by the power of the power member 60 and the restoring force of the elastic member 50, the main shaft 30 rotates in the second direction at a faster speed, allowing the elastic member 50 to assist in opening the circuit breaker, speeding up the opening process and improving the efficiency of current circuit interruption.

[0078] In this embodiment, the elastic member 50 can be an elastic structure such as a spring or a spring sheet. For example, in one optional embodiment, the elastic member 50 is a tension spring. A first cantilever 44 is provided on the stopper 40, and a second cantilever 32 is provided on the circumferential surface of the main shaft 30. The ends of the tension spring are respectively connected to the first cantilever 44 and the second cantilever 32.

[0079] The first cantilever 44 can be a bent structure provided on the stopper 40, such as by bending a portion of the mounting plate 43 to form the first cantilever 44. The first cantilever 44 can also be a raised structure such as a boss, without limitation. The second cantilever 32 can be a plate-like structure welded to the circumferential surface of the spindle 30, or a boss, a column, or other structure, without limitation.

[0080] In this embodiment, the elastic member 50 is a tension spring, and the tension springs are respectively connected to the first cantilever 44 and the second cantilever 32. The overall structure is simple and easy to assemble. In addition, the deformation mode of the tension spring is elongation and rebound, which is highly controllable and easy to replace.

[0081] In the moving contact assembly of this embodiment, the main shaft 30 can simultaneously drive the opening and closing of multiple groups of moving contacts 20 and static contacts. Figure 1 and Figure 2 As shown, there are multiple moving contacts 20, and the main shaft 30 is connected to each moving contact 20 through multiple connecting members 31 to drive each moving contact 20 to move synchronously.

[0082] In this configuration, each movable contact 20 faces a different stationary contact, and each pair of movable and stationary contacts forms a different current loop. When the main shaft 30 rotates in a first direction, each movable contact 20 approaches its corresponding stationary contact, simultaneously connecting multiple current loops. When the main shaft 30 rotates in a second direction, each movable contact 20 moves away from its corresponding stationary contact, simultaneously disconnecting multiple current loops.

[0083] In this manner, the main shaft 30 can simultaneously control the synchronous movement of multiple moving contacts 20, thereby simultaneously controlling the on and off of multiple current circuits. This is suitable for the total switch control of multiple current circuits and is more convenient to operate.

[0084] In this embodiment, when the main shaft 30 controls the on and off of multiple current circuits at the same time, the circuit breaker is large in size and the main shaft 30 is long, so the processing error and assembly error of the main shaft 30 will be more obvious. To solve this problem, multiple limit members 40 can be set in the axial direction of the main shaft 30 so that the longer shaft sections of the main shaft 30 will not affect the movable formation of the moving contact 20. Figure 1 As shown, a plurality of limiting members 40 are arranged in the axial direction of the main shaft 30 , and each limiting member 40 can abut against the circumferential surface of the main shaft 30 in the radial direction of the main shaft 30 .

[0085] In this embodiment, the limiting members 40 can be arranged at equal or unequal intervals along the axial direction of the main shaft 30. For example, when the main shaft 30 controls the movement of multiple movable contacts 20 simultaneously, a limiting member 40 can be provided between two adjacent movable contacts 20, or multiple limiting members 40 can be provided between two adjacent movable contacts 20, or a limiting member 40 can be provided at each end of multiple movable contacts 20 that are closely spaced.

[0086] This method limits the rotation range of different shaft sections of the main shaft 30 through multiple limit members 40, which can eliminate the influence of the processing errors of different shaft sections of the main shaft 30 on the movable stroke of the moving contact 20, making the contact between the moving contact 20 and the static contact more reliable.

[0087] The first embodiment above introduces the moving contact assembly in detail. The second embodiment below introduces a circuit breaker including the moving contact assembly, and the details are as follows.

[0088] The circuit breaker comprises a static contact and the movable contact assembly provided in the first embodiment. The movable contact and the static contact in the movable contact assembly are opposite to each other, and the movable contact can approach or move away from the static contact as the main shaft rotates.

[0089] The specific structure of the moving contact assembly in the circuit breaker corresponds to the moving contact assembly in the aforementioned embodiment. For its specific structural setting method, please refer to the relevant introduction of the moving contact assembly in any example related to the moving contact assembly. The similarities will not be described in detail in this embodiment.

[0090] In this circuit breaker, the moving contact approaches or moves away from the static contact as the main shaft rotates, and the limiter can abut against the circumferential surface of the main shaft in the radial direction of the main shaft, thereby limiting the rotatable space of the main shaft. Even if there are machining errors and assembly errors in the main shaft, the main shaft will rotate within the predetermined movable space under the restriction of the limiter. The movable stroke of the moving contact is not affected by the machining errors and assembly errors of the main shaft. When closing the circuit, the moving contact can easily generate sufficient overtravel to press on the static contact, thereby improving the reliability of the circuit breaker.

[0091] In summary, in the movable contact assembly and circuit breaker described above, the movable contact is driven toward or away from the static contact by the rotation of the main shaft, and the limiter presses against the circumferential surface of the main shaft in the radial direction of the main shaft, thereby limiting the rotation range of the main shaft and preventing the circumferential surface of the main shaft from excessively jumping during rotation. In this way, even if there are machining errors and assembly errors in the main shaft, the main shaft will rotate within the established movable space under the restriction of the limiter, making the rotation trajectory of the main shaft more controllable, reducing the impact of machining errors and assembly errors on the movable stroke of the movable contact, and ensuring that the movable contact has sufficient movable stroke. When closing the circuit, the movable contact can easily generate sufficient overtravel to press on the static contact, thereby improving the reliability of the contact between the movable contact and the static contact. In addition, when the limiter presses against the circumferential surface of the main shaft, it will provide a certain pressing force to the main shaft. Even if the movable contact and the static contact are subjected to currents such as short-time withstand current and short-time delay current when in contact, they are not easy to separate, thereby further improving the reliability of the contact between the movable contact and the static contact. In addition, the movable contact assembly has a simple structure, is easy to assemble and has a low cost.

[0092] Those skilled in the art will appreciate that, although some embodiments herein do not include certain features included in other embodiments, combinations of features from different embodiments are still within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0093] 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 moving contact assembly, applied to a circuit breaker, characterized in that: The moving contact assembly includes: a base, a moving contact, a main shaft and a limiter; the moving contact is used to face the static contact; The main shaft is rotatably arranged on the base, and the main shaft is connected to the moving contact, so that the main shaft can drive the moving contact to or away from the static contact by rotating; The limiting member is connected to the base, and the limiting member can abut against the circumferential surface of the main shaft in the radial direction of the main shaft.

2. The moving contact assembly according to claim 1, characterized in that: The limiting member is provided with a socket, and a bearing is provided at the socket; the outer circumferential surface of the bearing can abut against the circumferential surface of the main shaft to abut against the circumferential surface of the main shaft in the radial direction of the main shaft.

3. The moving contact assembly according to claim 2, characterized in that: The bearing includes a first bearing and a second bearing; there is a gap between the first bearing and the second bearing, and both the first bearing and the second bearing can abut against the circumferential surface of the main shaft in the radial direction of the main shaft.

4. The moving contact assembly according to claim 3, characterized in that: The limiting member includes a mounting plate, and the socket is arranged on the mounting plate; The first bearing and the second bearing are arranged on the same side of the mounting plate, or the first bearing and the second bearing are respectively arranged on opposite sides of the mounting plate.

5. The moving contact assembly according to claim 2, characterized in that: The limiting member further includes a mounting plate; The socket is a through hole provided on the mounting plate, or the socket is a groove provided at an edge of the mounting plate.

6. The moving contact assembly according to claim 1, characterized in that: The moving contact assembly further includes an elastic member; The elastic member is connected between the main shaft and the limiting member, and the elastic member can be deformed when the main shaft rotates in a first rotation direction; when the main shaft rotates in the first rotation direction, the moving contact approaches the static contact.

7. The moving contact assembly according to claim 6, characterized in that: The elastic member is a tension spring; A first cantilever is provided on the position-limiting member, a second cantilever is provided on the circumferential surface of the main shaft, and two ends of the tension spring are respectively connected to the first cantilever and the second cantilever.

8. The moving contact assembly according to claim 1, characterized in that: A plurality of the limiting members are arranged in the axial direction of the main shaft, and each of the limiting members can abut against the circumferential surface of the main shaft in the radial direction of the main shaft.

9. The moving contact assembly according to claim 1, characterized in that: There are multiple moving contacts, and the main shaft is connected to each moving contact through multiple connecting parts to drive each moving contact to move synchronously.

10. A circuit breaker, characterized in that: The circuit breaker comprises a static contact and a moving contact assembly according to any one of claims 1 to 9; The moving contact in the moving contact assembly is opposite to the static contact, and the moving contact can approach or move away from the static contact as the main shaft rotates.

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