A circuit breaker movable contact structure and circuit breaker

Abstract

The application provides a circuit breaker movable contact structure and a circuit breaker, and relates to the technical field of low-voltage electrical apparatuses. The circuit breaker movable contact structure comprises a movable contact, a contact seat, an elastic positioning assembly and a support. The contact seat is provided with a mounting groove, the elastic positioning assembly is arranged in the mounting groove through the support, the support is located between the elastic positioning assembly and the mounting groove, the movable contact is rotationally connected with the contact seat and abuts against the elastic positioning assembly. When a fault short-circuit current occurs, the elastic positioning assembly and the contact seat are spaced apart by the support, so that the force acting on the spring positioning assembly is transmitted to the support when the movable contact is repelled, that is, the spring positioning assembly does not directly impact the contact seat when the movable contact is repelled, the possibility of the contact seat being directly impacted and broken is reduced, especially the possibility of the groove bottom of the mounting groove with a relatively thin thickness on the contact seat being impacted and broken is reduced, the contact seat is effectively protected, and the impact resistance life of the contact seat is prolonged.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and in particular to a circuit breaker moving contact structure and a circuit breaker. Background Technology

[0002] A molded case low-voltage circuit breaker typically includes a stationary contact, a moving contact, a contact base, and an operating mechanism. The moving contact is rotatably connected to the contact base, and a spring is also connected to the contact base. The other end of the spring abuts against the moving contact, and the spring is used to lock the moving contact. The operating mechanism is connected to the contact base and is used to drive the contact base to rotate, so that the moving contact and the stationary contact make contact to close the circuit, or the moving contact and the stationary contact separate to open the circuit.

[0003] In related technologies, during the operation of a molded case low-voltage circuit breaker, when a large fault short-circuit current occurs in the line, the moving contact is repelled by the electric repulsive force before the operating mechanism operates, overcoming the contact pressure and opening prematurely, while the contact seat remains stationary. After the moving and stationary contacts have opened to their maximum opening distance, a spring keeps the moving contact at the position corresponding to the maximum opening distance until the operating mechanism trips, thus preventing the moving contact from falling due to the decrease in fault short-circuit current and causing arc reignition.

[0004] However, when the moving contact is pushed open by the electric repulsion force, the spring has a large impact on the contact seat, which makes the contact seat easy to break. This results in a low impact resistance life of the contact seat and affects the service life of the circuit breaker. Utility Model Content

[0005] This application provides a circuit breaker moving contact structure and circuit breaker to reduce the possibility of contact seat being damaged by impact when the moving contact is pushed open, thereby achieving effective protection of the contact seat and extending the impact resistance life of the contact seat.

[0006] In a first aspect, this application provides a circuit breaker moving contact structure, including a moving contact, a contact base, a resilient positioning component, and a bracket. The contact base has a mounting groove, and the resilient positioning component is mounted within the mounting groove via the bracket, with the bracket positioned between the resilient positioning component and the mounting groove. The moving contact is rotatably connected to the contact base and abuts against the resilient positioning component.

[0007] The circuit breaker moving contact structure provided in this application uses a bracket to house the elastic positioning component within a mounting groove on the contact seat. The bracket is positioned between the elastic positioning component and the mounting groove, thus separating the elastic positioning component from the groove wall, and consequently, separating the elastic positioning component from the contact seat. In practical use, when a large fault short-circuit current occurs, because the bracket separates the elastic positioning component from the contact seat, the force acting on the spring positioning component when the moving contact is repelled by the electric repulsive force is transmitted to the bracket. In other words, the force acting on the spring positioning component when the moving contact is repelled will not directly impact the contact seat, reducing the possibility of the contact seat breaking due to direct impact when the moving contact is repelled. In particular, it reduces the possibility of the thin mounting groove bottom being impacted and broken, effectively protecting the contact seat, extending its impact resistance life, and contributing to extending the service life of the circuit breaker containing the moving contact structure.

[0008] Furthermore, a mounting groove is provided on the contact seat, and the elastic positioning component is mounted in the mounting groove via a bracket. This arrangement serves two purposes: firstly, the elastic positioning component expands and contracts within the mounting groove, allowing the groove to guide this deformation and improving the positioning efficiency of the moving contact. Secondly, the mounting groove provides containment and protection for the elastic positioning component, extending its service life to some extent, thus contributing to a longer service life of the circuit breaker moving contact structure described in this application.

[0009] Meanwhile, since the elastic positioning component is mounted in the mounting slot via a bracket and abuts against the moving contact, during assembly, it is only necessary to install the bracket connected to the elastic positioning component in the mounting slot, so that the elastic positioning component abuts against the moving contact rotatably connected to the contact seat, thus realizing the assembly of the circuit breaker moving contact structure. Compared with the related technology that sets a connecting shaft on the moving contact, a torsion spring shaft on the contact seat, a torsion spring on the torsion spring shaft, one end of the torsion spring abutting against the contact seat, and the other end of the torsion spring connected to the connecting shaft, this simplifies the structure and assembly process, making assembly more convenient and improving assembly efficiency.

[0010] In one possible design, the support includes a main body and at least two legs. The at least two legs are circumferentially spaced along the main body, connected to the main body, and extending in a direction away from the main body. The main body and all the legs together enclose a receiving cavity for accommodating the resilient positioning component.

[0011] The above scheme arranges multiple legs circumferentially around the main body, with one end of each leg connected to the main body and the other end extending away from the main body. The main body and all the legs together form a receiving cavity, within which the elastic positioning component is housed. This design is simple and easy to manufacture. Furthermore, it facilitates the assembly of the elastic positioning component and provides guidance for its deformation, thus improving the repulsion efficiency of the moving contact.

[0012] In one possible design, a first connecting part is provided on the side of the support leg away from the main body, and a second connecting part is provided on the contact seat. The second connecting part is located near the groove of the mounting slot, and the support leg and the contact seat are connected by the cooperation of the first connecting part and the second connecting part.

[0013] With the above solution, a first connecting part is provided on the support leg, and a second connecting part is provided at the position of the contact seat near the opening of the mounting groove. In this way, the bracket with the elastic positioning component is placed in the mounting groove, and the first connecting part and the second connecting part are connected accordingly, so that the bracket with the elastic positioning component can be installed on the contact seat. The connection is convenient and stable.

[0014] In one possible design, the first connecting part includes a latching protrusion, and the second connecting part includes a latching groove into which the latching protrusion can be engaged.

[0015] The above solution sets the first connecting part on the support leg as a snap-fit ​​protrusion and the second connecting part on the contact seat near the groove of the mounting slot as a snap-fit ​​groove. The structure is simple and easy to manufacture. Furthermore, the bracket is connected to the mounting slot of the contact seat through the cooperation of the snap-fit ​​protrusion and the snap-fit ​​groove, making assembly convenient and stable.

[0016] In one possible design, the wall of the mounting groove is provided with at least two limiting grooves for accommodating the legs. The at least two limiting grooves are arranged at intervals along the circumference of the mounting groove, and the limiting grooves correspond one-to-one with the legs.

[0017] The above scheme involves setting multiple limiting grooves on the wall of the mounting groove. These grooves are arranged at intervals along the circumference of the mounting groove, and the number of limiting grooves matches the number of support legs. During assembly, the bracket is inserted into the mounting groove, ensuring that at least a portion of each support leg extends into its corresponding limiting groove. This design offers several advantages. First, the limiting grooves guide the support legs during installation, facilitating rapid assembly of the bracket within the mounting groove and improving assembly efficiency. Second, the limiting grooves provide some restraint to the support legs, enhancing the structural stability of the bracket within the mounting groove and contributing to the structural stability of the circuit breaker's moving contact structure. Third, arranging the support legs within the limiting grooves on the mounting groove wall provides ample installation and expansion / contraction space for the elastic positioning components.

[0018] In one possible design, the shape of the main body matches the shape of the bottom of the mounting groove.

[0019] The above solution matches the shape of the main body to the bottom of the mounting groove. On one hand, the main body provides better coverage of the groove bottom, improving the isolation between the groove bottom and the spring positioning assembly, thereby extending the impact resistance life of the thinner groove bottom. On the other hand, it guides and positions the bracket within the mounting groove, facilitating rapid assembly and further improving assembly efficiency.

[0020] In one possible design, the connection between the support leg and the main body is rounded, with the rounded part protruding away from the elastic positioning component.

[0021] By using the above solution, the connection between the outrigger and the main body is made with a rounded transition, which to a certain extent avoids stress concentration at the connection between the outrigger and the main body, improves the structural stability of the outrigger, and thus makes the outrigger better able to contain and protect the spring positioning assembly.

[0022] In one possible design, the legs are integrally molded with the main body.

[0023] The above design integrates the outriggers and the main body into a single unit, resulting in better overall integrity and higher structural strength of the support structure. It also facilitates assembly.

[0024] In one possible design, there is a gap between the bracket and the bottom of the mounting slot.

[0025] The above design creates a gap between the bracket and the bottom of the mounting groove. This means that when the bracket, connected to the spring positioning assembly, is fully assembled in the mounting groove, it does not contact the bottom of the groove; a gap exists between them, forming an air protective layer. This design separates the thinner bottom of the mounting groove from the elastic positioning assembly through the bracket and the air protective layer, further reducing the possibility of the groove bottom cracking due to impact, thereby further improving the impact resistance life of the contact seat.

[0026] In one possible design, the resilient positioning assembly includes a positioning element and a resilient element. The bracket has a receiving cavity for accommodating the resilient positioning assembly. One end of the resilient element is connected to the cavity wall, and the other end of the resilient element surrounds the circumferential outer side of the positioning element and is fixed relative to the positioning element. The positioning element is clearance-fitted with the receiving cavity, and the side of the positioning element opposite to the resilient element abuts against the moving contact.

[0027] The above scheme enables the elastic positioning assembly to include a positioning element and an elastic element. One end of the elastic element is connected to the cavity wall of the bracket's receiving cavity, and the other end of the elastic element surrounds the circumferential outer side of the positioning element. The side of the positioning element facing away from the elastic element abuts against the moving contact. The positioning element also has a clearance fit with the bracket's receiving cavity. The structure is simple and easy to assemble.

[0028] In one possible design, the positioning element includes a connected positioning shaft and a positioning seat. The other end of the elastic element surrounds the circumferential outer side of the positioning shaft and is fixed relative to the positioning shaft; the side of the positioning seat facing away from the positioning shaft has a first limiting portion, and the side of the moving contact facing the positioning seat has a second limiting portion. The first limiting portion and the second limiting portion cooperate to limit the moving contact.

[0029] The above scheme makes the positioning component include a positioning shaft and a positioning seat, which are connected together. The other end of the elastic element is positioned around the circumferential outer side of the positioning shaft, which not only facilitates assembly but also improves the guiding effect of the positioning shaft on the elastic element, thus helping to enhance the repulsion efficiency of the elastic element against the moving contact.

[0030] A first limiting part is provided on the side of the positioning seat away from the positioning shaft, and a second limiting part is provided on the side of the moving contact facing the positioning seat. The structure is simple and easy to manufacture. The positioning seat can limit the moving contact through the cooperation of the first limiting part and the second limiting part, and the limiting effect is good.

[0031] In one possible design, the first limiting part includes a limiting groove, and the second limiting part includes a limiting protrusion extending into the limiting groove. The bottom of the limiting groove is an inclined surface, and in the direction along the rotation axis of the moving contact from the mounting groove to the side thereon, the inclined surface is inclined toward the direction closer to the mounting groove.

[0032] The above solution involves configuring the first limiting part on the positioning seat as a limiting groove and the second limiting part on the moving contact as a limiting protrusion, allowing the limiting protrusion to extend into the limiting groove and abut against the bottom of the groove. This configuration increases the contact area between the positioning seat and the moving contact, improving the stability of the contact. Furthermore, the limiting groove guides the repulsion of the moving contact, facilitating rapid repulsion and thus protecting the circuit and electrical equipment.

[0033] Furthermore, by setting the bottom of the limiting groove as an inclined surface, the guiding effect of the limiting groove on the moving contact is enhanced, which facilitates the rapid repulsion of the moving contact, thereby enhancing the protection of the circuit and electrical equipment by the circuit breaker with the moving contact structure of this application.

[0034] Secondly, this application provides a circuit breaker, including the circuit breaker moving contact structure as described above.

[0035] The beneficial effects of the circuit breakers provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0036] Figure 1 This is an assembly diagram of the moving contact structure of a circuit breaker according to an embodiment of this application, wherein the moving contact is in the closed state.

[0037] Figure 2 This is an assembly diagram of the moving contact structure of a circuit breaker according to an embodiment of this application, wherein the moving contact is in a repelled state.

[0038] Figure 3 This is a bottom view of the moving contact structure of a circuit breaker according to an embodiment of this application.

[0039] Figure 4 for Figure 3 A magnified view of part A in the middle.

[0040] Figure 5 This is an isometric view of the support for the moving contact structure of the circuit breaker according to an embodiment of this application.

[0041] Figure 6 This is an isometric view of the contact seat of the moving contact structure of the circuit breaker according to an embodiment of this application.

[0042] Figure 7 This is an isometric view of the positioning element of the moving contact structure of the circuit breaker according to an embodiment of this application.

[0043] Figure 8 This is an isometric view of the moving contact of the circuit breaker moving contact structure according to an embodiment of this application.

[0044] Explanation of reference numerals in the attached drawings: 1. Moving contact; 11. Moving contact point; 2. Contact seat; 21. Mounting groove; 211. Limiting groove; 3. Elastic positioning assembly; 31. Positioning element; 311. Positioning shaft; 312. Positioning seat; 32. Elastic element; 4. Bracket; 41. Main body; 42. Support leg; 51. First connecting part; 52. Second connecting part; 6. Gap; 71. First limiting part; 72. Second limiting part; 73. Inclined surface; 8. Stationary contact; 81. Stationary contact point. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0047] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0049] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the structure of the moving contact of the circuit breaker or the specific structure of the circuit breaker in this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0051] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by screws, bolts, or other spacers; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] A molded case low-voltage circuit breaker typically includes a stationary contact, a moving contact, a contact base, and an operating mechanism. The moving contact is rotatably connected to the contact base, and a spring is also connected to the contact base, with the other end of the spring abutting against the contact base. The spring is used to lock the moving contact. The operating mechanism is connected to the contact base and is used to drive the contact base to rotate, so that the moving contact and the stationary contact make contact to close the circuit, or to separate the moving contact and the stationary contact to open the circuit.

[0054] In related technologies, during the operation of a molded case low-voltage circuit breaker, when a large fault short-circuit current occurs in the line, the moving contact is repelled by the electric repulsive force before the operating mechanism operates, overcoming the contact pressure and opening prematurely, while the contact seat remains stationary. After the moving and stationary contacts have opened to their maximum opening distance, a spring keeps the moving contact in its maximum position until the operating mechanism trips, thus preventing the moving contact from falling due to the decrease in fault short-circuit current and causing arc reignition.

[0055] However, when the moving contact is pushed open by the electric repulsive force, the spring has a large impact on the contact seat, which makes the contact seat easy to break. This results in a low impact resistance life of the contact seat and affects the service life of the circuit breaker.

[0056] Based on this, this embodiment provides a circuit breaker moving contact structure and a circuit breaker. By providing a mounting groove on the contact seat, an elastic positioning component is mounted within the mounting groove via a bracket, with the bracket positioned between the elastic positioning component and the mounting groove. This bracket separates the elastic positioning component from the groove wall, effectively isolating the elastic positioning component from the contact seat. When a large fault short-circuit current occurs, because the bracket separates the elastic positioning component from the contact seat, the force acting on the spring positioning component when the moving contact is repelled by the electric repulsive force is transmitted to the bracket. In other words, the force acting on the spring positioning component when the moving contact is repelled will not directly impact the contact seat, reducing the possibility of the contact seat breaking due to direct impact when the moving contact is repelled. In particular, it reduces the possibility of the bottom of the thin mounting groove on the contact seat being impacted and broken, achieving effective protection of the contact seat, extending the impact resistance life of the contact seat, and contributing to extending the service life of the circuit breaker containing the moving contact structure.

[0057] The moving contact structure and circuit breaker provided in this embodiment will be described in detail below with reference to the accompanying drawings and specific examples.

[0058] refer to Figures 1 to 3 As shown, this embodiment provides a circuit breaker, which includes a housing, a stationary contact 8, and a moving contact structure. Both the stationary contact 8 and the moving contact structure are disposed within the housing.

[0059] An arc-extinguishing structure is also provided inside the housing, and the arc-extinguishing structure has an arc-extinguishing cavity. The stationary contact 8 is disposed inside the arc-extinguishing cavity, and the stationary contact 8 includes a stationary contact point 81.

[0060] The circuit breaker moving contact structure includes a moving contact 1, which is located outside the arc-extinguishing cavity. An opening is provided on the arc-extinguishing cavity for the moving contact 1 to extend into the cavity. The moving contact 1 includes a moving contact point 11 and is rotatable relative to the housing.

[0061] Specifically, the moving contact 1 can rotate relative to the housing towards the stationary contact 8, so that the moving contact 11 contacts the stationary contact 81, thereby closing the circuit breaker and realizing electrical conduction. The moving contact 1 can also rotate relative to the housing away from the stationary contact 8, so that the moving contact 11 separates from the stationary contact 81, thereby opening the circuit breaker, releasing electrical conduction, and thus protecting the circuit and electrical equipment.

[0062] refer to Figures 1 to 4 As shown, this embodiment also provides a circuit breaker moving contact structure, which includes a moving contact 1, a contact base 2, an elastic positioning component 3, and a bracket 4.

[0063] Continue to refer to Figures 1 to 4As shown, the contact base 2 is provided with a mounting groove 21. The elastic positioning component 3 is disposed in the mounting groove 21 via a bracket 4, and the bracket 4 is located between the elastic positioning component 3 and the mounting groove 21. Specifically, the bracket 4 is located between the outer wall of the elastic positioning component 3 and the groove wall of the mounting groove 21. The moving contact 1 is rotatably connected to the contact base 2 and abuts against the elastic positioning component 3.

[0064] Specifically, the contact seat 2 is located inside the circuit breaker housing and can rotate relative to the housing.

[0065] Circuit breakers typically also include an operating mechanism, which is housed within the casing and connected to the contact base 2. The operating mechanism is used to drive the contact base 2 to rotate relative to the casing to the closed or open position.

[0066] One end of the moving contact 1 is rotatably connected to the contact base 2, and the end of the moving contact 1 away from the contact base 2 is provided with a moving contact 11.

[0067] When the operating mechanism drives the contact base 2 to the closed position, the moving contact 1 is in the closed position, and the moving contact 11 contacts the stationary contact 81, thereby closing the circuit breaker and realizing electrical conduction; when the operating mechanism drives the contact base 2 to the open position, the moving contact 1 is in the open position, and the moving contact 11 separates from the stationary contact 81, thereby opening the circuit breaker and releasing electrical conduction.

[0068] refer to Figure 1 As shown, when the moving contact 1 is in the normal closed state, the moving contact 11 of the moving contact 1 contacts the stationary contact 81 of the stationary contact 8 in the circuit breaker, realizing electrical conduction. At this time, the elastic positioning component 3 provides a certain elastic force to the moving contact 1, limiting the moving contact 1 and keeping the moving contact 1 in the closed state.

[0069] refer to Figure 2 As shown, when a large fault short-circuit current occurs in the line, before the operating mechanism operates, the moving contact 1 overcomes the contact pressure and opens prematurely under the action of electric repulsion, while the contact seat 2 remains stationary. After the moving contact 1 and the stationary contact 8 open to the maximum distance, the elastic positioning component 3 keeps the moving contact 1 at the position corresponding to the maximum opening distance until the operating mechanism trips, so as to prevent the moving contact 1 from falling due to the decrease of the fault short-circuit current and causing the arc to reignite.

[0070] In a specific implementation, the support 4 can be a metal support made of materials such as iron or aluminum, which has good ductility and weather resistance, and a certain degree of elasticity. Of course, in other implementations, the support 4 can be a plastic support.

[0071] The circuit breaker moving contact structure provided in this embodiment comprises a moving contact 1, a contact base 2, an elastic positioning component 3, and a bracket 4. An mounting groove 21 is provided on the contact base 2. The elastic positioning component 3 is positioned within the mounting groove 21 via the bracket 4, with the bracket 4 located between the elastic positioning component 3 and the mounting groove 21. The moving contact 1 is rotatably connected to the contact base 2 and abuts against the elastic positioning component 3. Because the elastic positioning component 3 is positioned within the mounting groove 21 via the bracket 4, and the bracket 4 is located between the elastic positioning component 3 and the mounting groove 21, the bracket 4 separates the elastic positioning component 3 from the groove wall of the mounting groove 21, i.e., the bracket 4 separates the elastic positioning component 3 from the contact base 2.

[0072] In practical use, when a large fault short-circuit current occurs, because the bracket 4 separates the elastic positioning component 3 and the contact seat 2, when the moving contact 1 is repelled by the electric repulsion force, the force acting on the spring positioning component will be transmitted to the bracket 4. In other words, the force acting on the spring positioning component when the moving contact 1 is repelled will not contact the contact seat 2 directly, thus reducing the possibility of the contact seat 2 being directly impacted and broken when the moving contact 1 is repelled. In particular, it reduces the possibility of the bottom of the thin mounting groove 21 on the contact seat 2 being impacted and broken, effectively protecting the contact seat 2, extending its impact resistance life, and helping to extend the service life of the circuit breaker containing the moving contact structure.

[0073] Furthermore, a mounting groove 21 is provided on the contact base 2, and the elastic positioning component 3 is placed in the mounting groove 21 via the bracket 4. This arrangement serves two purposes: firstly, the elastic positioning component 3 undergoes expansion and contraction within the mounting groove 21, allowing the mounting groove 21 to guide the deformation of the elastic positioning component 3, thereby improving the positioning efficiency of the elastic positioning component 3 for the moving contact 1. Secondly, the mounting groove 21 provides containment and protection for the elastic positioning component 3, extending its service life to a certain extent, and contributing to extending the service life of the circuit breaker moving contact structure in this embodiment.

[0074] Meanwhile, since the elastic positioning component 3 is set in the mounting groove 21 via the bracket 4 and abuts against the moving contact 1, during assembly, it is only necessary to install the bracket 4 connected to the elastic positioning component 3 in the mounting groove 21 so that the elastic positioning component 3 abuts against the moving contact 1 rotatably connected to the contact seat 2, thus realizing the assembly of the circuit breaker moving contact structure. Compared with the related technology that sets a connecting shaft on the moving contact 1, sets a torsion spring shaft on the contact seat 2, sleeves a torsion spring on the torsion spring shaft, abuts one end of the torsion spring against the contact seat 2, and connects the other end of the torsion spring to the connecting shaft, this simplifies the structure and assembly process, makes assembly convenient, and improves assembly efficiency.

[0075] refer to Figures 3 to 5As shown, in some embodiments, the support 4 includes a main body 41 and at least two legs 42. The at least two legs 42 are arranged circumferentially spaced along the main body 41, the legs 42 are connected to the main body 41 and extend in a direction away from the main body 41, and the main body 41 and all the legs 42 together enclose a receiving cavity for accommodating the elastic positioning component 3.

[0076] Multiple legs 42 are spaced apart circumferentially along the main body 41, with one end of each leg 42 connected to the main body 41 and the other end extending away from the main body 41. The main body 41 and all the legs 42 together form a receiving cavity, within which the elastic positioning component 3 is disposed. This design is simple and easy to manufacture. Furthermore, it facilitates the assembly of the elastic positioning component 3 and provides guidance for its deformation, thus helping to improve the repulsion efficiency of the moving contact 1.

[0077] For example, refer to Figure 5 As shown, the support 4 includes a main body 41 and two legs 42, which are located on the same side of the main body 41 and are positioned opposite each other. One end of each leg 42 is connected to the main body 41, and the other end of each leg 42 extends away from the main body 41. The main body 41 and the two legs 42 together form a receiving cavity for accommodating the elastic positioning component 3. The main body 41 and the two legs 42 can be, for example, formed into a "U"-shaped structure.

[0078] In practice, the support leg 42 and the main body 41 can be integrally formed, resulting in good overall integrity and high structural strength. Of course, in other implementations, the support leg 42 and the main body 41 can also be connected together by welding or other methods.

[0079] The following embodiments are explained and illustrated using a bracket 4 having two legs 42.

[0080] In practical use, when the bracket 4 connected to the elastic positioning component 3 is placed in the mounting groove 21, the main body 41 is located between the elastic positioning component 3 and the bottom of the mounting groove 21, and each leg 42 is located between the elastic positioning component 3 and the groove wall of the mounting groove 21. The elastic positioning component 3 is located in the receiving cavity of the bracket 4, and the bracket 4 isolates the elastic positioning component 3 from the mounting groove 21. Therefore, when a large fault short-circuit current occurs in the line, during the process of the moving contact 1 being repelled by the electric repulsive force, the elastic positioning component 3 will not contact the mounting groove 21. In other words, the force exerted on the spring positioning component by the moving contact 1 during the repulsion process will not contact the mounting groove 21 but will directly impact the mounting groove 21, further improving the protection of the contact seat 2, thereby further extending the impact resistance life of the contact seat 2 and making the circuit breaker with the moving contact structure of this embodiment have a longer service life.

[0081] In some embodiments, the support leg 42 and the main body 41 may be integrally formed.

[0082] By integrally molding the support leg 42 and the main body 41, the bracket 4 achieves better overall integrity and higher structural strength. It also facilitates assembly.

[0083] Of course, in other embodiments, the support leg 42 and the main body 41 may be connected together by welding, for example.

[0084] refer to Figure 4 and Figure 5 As shown, in some embodiments, a first connecting part 51 is provided on the side of the support leg 42 away from the main body 41, and a second connecting part 52 is provided on the contact seat 2. The second connecting part 52 is provided near the groove of the mounting groove 21, and the support leg 42 is connected to the contact seat 2 through the first connecting part 51 and the second connecting part 52.

[0085] By providing a first connecting part 51 on the support leg 42 and a second connecting part 52 at the position near the opening of the mounting groove 21 on the contact seat 2, the bracket 4 connected to the elastic positioning component 3 can be placed in the mounting groove 21, and the first connecting part 51 and the second connecting part 52 can be connected accordingly, so that the bracket 4 connected to the elastic positioning component 3 can be installed on the contact seat 2, which is convenient and stable.

[0086] Meanwhile, since the second connecting part 52 is located close to the opening of the mounting groove 21 on the contact seat 2, that is, the second connecting part 52 is located outside the mounting groove 21, the connection between the bracket 4 and the contact seat 2 is located outside the mounting groove 21. The connection between the two will not occupy the space inside the mounting groove 21, thereby providing a larger installation space and expansion and contraction space for the elastic positioning component 3, and will not interfere with the elastic positioning component 3. The layout is reasonable.

[0087] In other implementations, the second connecting part 52 can also be located at other positions of the contact seat 2, as long as the second connecting part 52 can cooperate with the first connecting part 51 to connect, and the bracket 4 with the spring positioning assembly can be installed in the mounting groove 21.

[0088] Continue to refer to Figure 4 and Figure 5 As shown, in some embodiments, the first connecting portion 51 includes a latching protrusion, and the second connecting portion 52 includes a latching groove into which the latching protrusion can be latched.

[0089] By setting the first connecting part 51 on the support leg 42 as a locking protrusion and setting the second connecting part 52 on the contact seat 2 near the groove of the mounting groove 21 as a locking groove, the structure is simple and easy to manufacture. Furthermore, through the cooperation of the locking protrusion and the locking groove, the bracket 4 is connected in the mounting groove 21 of the contact seat 2, making assembly convenient and stable.

[0090] Furthermore, the bracket 4 is installed in the mounting slot 21 of the contact seat 2 through the cooperation of the protrusion and the slot. It is easy to disassemble and reassemble. If either the bracket 4 or the contact seat 2 is damaged and needs to be replaced, the bracket 4 and the contact seat 2 can be disassembled and the damaged one can be replaced. There is no need to replace both as a whole, which saves costs to a certain extent.

[0091] In other embodiments, the first connecting portion 51 may include a card slot, and the second connecting portion 52 may include a card protrusion that can extend into the card slot.

[0092] refer to Figure 6 As shown, in some embodiments, at least two limiting grooves 211 for accommodating the support legs 42 are provided on the groove wall of the mounting groove 21. The at least two limiting grooves 211 are arranged at intervals along the circumference of the mounting groove 21, and the limiting grooves 211 correspond one-to-one with the support legs 42.

[0093] Multiple limiting grooves 211 are provided on the wall of the mounting groove 21. These grooves are spaced apart circumferentially within the mounting groove 21, and the number of limiting grooves 211 matches the number of legs 42. During assembly, the bracket 4 is inserted into the mounting groove 21, with at least a portion of each leg 42 extending into its corresponding limiting groove 211. This arrangement has several advantages: First, the limiting grooves 211 guide the legs 42 during installation, facilitating rapid assembly of the bracket 4 within the mounting groove 21 and improving assembly efficiency. Second, the limiting grooves 211 provide a certain degree of restraint on the legs 42, enhancing the structural stability of the bracket 4 within the mounting groove 21 and contributing to the structural stability of the circuit breaker's moving contact structure. Third, arranging the legs 42 within the limiting grooves 211 on the wall of the mounting groove 21 provides ample installation and expansion / contraction space for the elastic positioning assembly 3.

[0094] For example, refer to Figure 6 As shown, two limiting grooves 211 are provided on the groove wall of the mounting groove 21, and the two limiting grooves 211 are arranged opposite to each other. Figure 5 When the bracket 4 with two legs 42 shown is assembled into the mounting groove 21, the two legs 42 are respectively inserted into the two limiting grooves 211, and then the bracket 4 is moved into place on the side where the bottom of the mounting groove 21 is located. In this way, the locking protrusion on the legs 42 can engage with the locking groove on the contact seat 2, thereby realizing the assembly of the bracket 4 in the mounting groove 21, which is convenient.

[0095] refer to Figure 5 and Figure 6 As shown, in some embodiments, the shape of the main body 41 matches the shape of the bottom of the mounting groove 21.

[0096] By matching the shape of the main body 41 to the shape of the bottom of the mounting groove 21, the main body 41 provides better coverage of the bottom of the mounting groove 21, improving the isolation between the bottom of the mounting groove 21 and the spring positioning assembly, thereby extending the impact resistance life of the thinner bottom of the mounting groove 21. Furthermore, it guides and positions the bracket 4 within the mounting groove 21, preventing incorrect assembly and facilitating rapid assembly of the bracket 4, further improving the assembly efficiency of the bracket 4.

[0097] In some implementations, the bottom of the mounting slot 21 is elliptical. For example, in a specific implementation, refer to... Figure 5 As shown, the main body 41 is elliptical in shape. The assembly of the elliptical main body 41 has a certain directionality, making it less prone to incorrect assembly. It also guides the assembly of the bracket 4, resulting in high assembly efficiency. Furthermore, after the elliptical main body 41 is assembled in place within the mounting groove 21, its position is stable and it will not wobble along the circumference of the mounting groove 21, thus providing a certain positioning and limiting effect on the bracket 4.

[0098] refer to Figure 4 and Figure 5 As shown, in some embodiments, the connection between the support leg 42 and the main body 41 is rounded, and the rounded part protrudes in a direction away from the elastic positioning component 3.

[0099] By using a rounded transition at the connection between the support leg 42 and the main body 41, stress concentration at the connection between the support leg 42 and the main body 41 is avoided to a certain extent, which improves the structural stability of the support leg 42 and thus provides better protection for the spring positioning assembly.

[0100] refer to Figure 4 As shown, in some embodiments, there is a gap 6 between the bracket 4 and the bottom of the mounting groove 21 (see reference). Figure 4 L in the middle.

[0101] By creating a gap 6 between the bracket 4 and the bottom of the mounting groove 21, that is, when the bracket 4, connected to the spring positioning assembly, is assembled in the mounting groove 21, the bracket 4 does not contact the bottom of the mounting groove 21, and there is a gap between them, which forms an air protective layer. This arrangement separates the thinner bottom of the mounting groove 21 from the elastic positioning assembly 3 through the bracket 4 and the air protective layer, further reducing the possibility of the bottom of the mounting groove 21 being broken by impact, thereby further improving the impact resistance life of the contact seat 2.

[0102] Meanwhile, the air protective layer also absorbs, buffers, and dampens the force on the support 4 when the moving contact 1 is pushed away, thereby reducing the force transmitted from the support 4 to the contact seat 2 and further improving the protection effect on the contact seat 2.

[0103] In practice, the gap 6 can be 1mm-2mm in the direction from the bottom of the mounting groove 21 to the opening of the mounting groove 21.

[0104] refer to Figure 4 and Figure 7 As shown, in some embodiments, the elastic positioning component 3 includes a positioning element 31 and an elastic element 32. The bracket 4 has a receiving cavity for accommodating the elastic positioning component 3. One end of the elastic element 32 is connected to the cavity wall of the receiving cavity, and the other end of the elastic element 32 surrounds the circumferential outer side of the positioning element 31 and is fixed relative to the positioning element 31. The positioning element 31 is fitted with the receiving cavity through a gap 6, and the side of the positioning element 31 facing away from the elastic element 32 abuts against the moving contact 1.

[0105] By making the elastic positioning assembly 3 include a positioning element 31 and an elastic element 32, one end of the elastic element 32 is connected to the cavity wall of the receiving cavity of the bracket 4, and the other end of the elastic element 32 surrounds the circumferential outer side of the positioning element 31. The side of the positioning element 31 opposite to the elastic element 32 abuts against the moving contact 1, and the positioning element 31 also mates with the gap 6 of the receiving cavity of the bracket 4. The structure is simple and the assembly is convenient.

[0106] Meanwhile, since the other end of the elastic element 32 is surrounded on the circumferential outer side of the positioning element 31, the positioning element 31 not only has a limiting effect on the moving contact 1, but also has a certain guiding effect on the expansion and contraction deformation of the elastic element 32.

[0107] In some implementations, the elastic element 32 is fixed to the cavity wall of the receiving cavity of the bracket 4 using a connector, resulting in high structural stability. Of course, the elastic element 32 can also be directly abutted against the cavity wall for easier assembly.

[0108] The elastic element 32 can be directly mounted around the outer circumference of the positioning element 31 to achieve a connection. Alternatively, the elastic element 32 can be sleeved around the outer circumference of the positioning element 31 and connected to the outer wall of the positioning element 31.

[0109] In practice, the size of the positioning member 31 is, for example, not less than 1 / 4 of the size of the mounting groove 21 in the direction from the bottom of the mounting groove 21 to the opening of the mounting groove 21. This results in a larger contact area between the positioning member 31 and the elastic member 32, higher structural stability, and better guiding effect on the elastic member 32.

[0110] refer to Figure 4 , Figure 7 and Figure 8 As shown, in some embodiments, the positioning member 31 includes a connected positioning shaft 311 and a positioning seat 312. The other end of the elastic member 32 surrounds the circumferential outer side of the positioning shaft 311 and is fixed relative to the positioning shaft 311. The side of the positioning seat 312 facing away from the positioning shaft 311 has a first limiting portion 71, and the side of the moving contact 1 facing the positioning seat 312 has a second limiting portion 72. The first limiting portion 71 and the second limiting portion 72 cooperate to limit the moving contact 1.

[0111] By making the positioning member 31 include a positioning shaft 311 and a positioning seat 312, and connecting the positioning shaft 311 and the positioning seat 312, and by surrounding the other end of the elastic member 32 around the circumferential outer side of the positioning shaft 311, not only is assembly convenient, but the guiding effect of the positioning shaft 311 on the elastic member 32 is also better, which helps to improve the repulsion efficiency of the elastic member 32 on the moving contact 1.

[0112] Furthermore, a first limiting part 71 is provided on the side of the positioning seat 312 away from the positioning shaft 311, and a second limiting part 72 is provided on the side of the moving contact 1 facing the positioning seat 312. The structure is simple and easy to manufacture. Through the cooperation of the first limiting part 71 and the second limiting part 72, the positioning seat 312 limits the moving contact 1, and the limiting effect is good.

[0113] refer to Figure 1 and Figure 7 As shown, when the moving contact 11 contacts the stationary contact 81, the first limiting part 71 and the second limiting part 72 have a first mating position. (Reference) Figure 2 and Figure 7 As shown, when the moving contact 11 separates from the stationary contact 81, the first limiting part 71 and the second limiting part 72 have a second mating position.

[0114] refer to Figure 7 and Figure 8 As shown, in some embodiments, the first limiting portion 71 includes a limiting groove, and the second limiting portion 72 includes a limiting protrusion extending into the limiting groove. (See reference...) Figure 1As shown, when the moving contact 11 contacts the stationary contact 81, the limiting protrusion abuts against the bottom of the limiting groove, and the limiting protrusion is located at the first mating position. (Reference) Figure 2 As shown, when the moving contact 11 and the stationary contact 81 separate, the limiting protrusion abuts against the bottom of the limiting groove, and the limiting protrusion is located at the second mating position.

[0115] The bottom of the limiting groove is an inclined surface 73, extending from the side where the first mating position is located to the side where the second mating position is located (see reference). Figure 1 and Figure 2 In the Y direction, the inclined surface 73 is inclined toward the direction close to the mounting groove 21.

[0116] By configuring the first limiting part 71 on the positioning seat 312 as a limiting groove and the bottom of the limiting groove as an inclined surface 73, and configuring the second limiting part 72 on the moving contact 1 as a limiting protrusion, the limiting protrusion extends into the limiting groove and abuts against the inclined surface 73. This configuration increases the contact area between the positioning seat 312 and the moving contact 1, improving the stability of the contact between them. Furthermore, the limiting groove guides the repulsion of the moving contact 1, facilitating its rapid repulsion in a predetermined direction, thereby protecting the circuit and electrical equipment.

[0117] Furthermore, by setting the bottom of the limiting groove as an inclined surface 73, the guiding effect of the limiting groove on the moving contact 1 is enhanced, which facilitates the rapid repulsion of the moving contact and thus enhances the protection of the circuit breaker with the moving contact structure of this embodiment for the circuit and electrical equipment.

[0118] In other embodiments, the first limiting portion 71 on the positioning seat 312 is a positioning protrusion, and the second limiting portion 72 on the moving contact 1 includes a limiting groove into which the limiting protrusion can extend.

[0119] For specific usage, please refer to... Figure 1 As shown, the moving contact 11 contacts the stationary contact 81. When the circuit breaker is closed, the elastic element 32 is compressed. The elastic element 32 transmits the elastic force to the moving contact 1 through the positioning element 31, providing reliable contact pressure to the moving contact 1.

[0120] When there is a fault short-circuit current, the contact seat 2 remains in the closed position. The short-circuit current provides an electric repulsive force to the moving contact 1. The direction of the electric repulsive force is opposite to the direction of the contact pressure.

[0121] When the electric repulsive force is greater than the contact pressure provided by the elastic element 32 to the moving contact 1, the moving contact 1 is repelled away from the stationary contact 8. At this time, the electric repulsive force can be used to increase the breaking speed of the moving contact 1, so as to achieve the breaking in the short circuit current rising stage, which to a certain extent avoids the phenomenon that the breaking risk increases due to the slow breaking speed.

Claims

1. A circuit breaker moving contact structure, characterized in that, Includes moving contact, contact seat, flexible positioning component and support; The contact seat is provided with a mounting groove, the elastic positioning component is mounted in the mounting groove through the bracket, and the bracket is located between the elastic positioning component and the mounting groove; The moving contact is rotatably connected to the contact seat and abuts against the elastic positioning component.

2. The circuit breaker moving contact structure according to claim 1, characterized in that, The support includes a main body and at least two legs; At least two of the legs are circumferentially spaced along the main body, the legs are connected to the main body and extend in a direction away from the main body, and the main body and all the legs together enclose a receiving cavity for accommodating the elastic positioning assembly.

3. The circuit breaker moving contact structure according to claim 2, characterized in that, A first connecting portion is provided on the side of the support leg away from the main body, and a second connecting portion is provided on the contact seat. The second connecting portion is located near the opening of the mounting groove, and the support leg and the contact seat are connected by the cooperation of the first connecting portion and the second connecting portion.

4. The circuit breaker moving contact structure according to claim 3, characterized in that, The first connecting part includes a latching protrusion, and the second connecting part includes a latching groove into which the latching protrusion can be engaged.

5. The circuit breaker moving contact structure according to claim 2, characterized in that, The mounting groove has at least two limiting grooves for accommodating the support legs. The at least two limiting grooves are spaced apart along the circumference of the mounting groove, and the limiting grooves correspond one-to-one with the support legs. And / or, the shape of the main body matches the shape of the bottom of the mounting groove; And / or, the connection between the support leg and the main body is rounded, and the rounded part protrudes in a direction away from the elastic positioning component; And / or, the support leg is integrally formed with the main body.

6. The circuit breaker moving contact structure according to claim 1, characterized in that, There is a gap between the bracket and the bottom of the mounting groove.

7. The circuit breaker moving contact structure according to any one of claims 1 to 6, characterized in that, The elastic positioning component includes a positioning element and an elastic element; The bracket has a receiving cavity for accommodating the elastic positioning component. One end of the elastic element is connected to the cavity wall of the receiving cavity, and the other end of the elastic element surrounds the circumferential outer side of the positioning element and is fixed relative to the positioning element. The positioning element is in clearance fit with the receiving cavity, and the side of the positioning element opposite to the elastic element abuts against the moving contact.

8. The circuit breaker moving contact structure according to claim 7, characterized in that, The positioning element includes a connected positioning shaft and a positioning seat; The other end of the elastic element is arranged around the circumferential outer side of the positioning shaft and is fixed relative to the positioning shaft; the side of the positioning seat away from the positioning shaft has a first limiting part, and the side of the moving contact facing the positioning seat has a second limiting part. The first limiting part and the second limiting part cooperate to limit the moving contact.

9. The circuit breaker moving contact structure according to claim 8, characterized in that, The first limiting part includes a limiting groove, and the second limiting part includes a limiting protrusion extending into the limiting groove; The bottom of the limiting groove is an inclined surface, and in the direction along the rotation axis of the moving contact, the inclined surface is inclined toward the direction close to the mounting groove.

10. A circuit breaker, characterized in that, Includes the circuit breaker moving contact structure as described in any one of claims 1 to 9.

Images