Circuit breaker

Abstract

The utility model provides a circuit breaker, and relates to the technical field of low-voltage electric appliances. The circuit breaker comprises a shell, a static contact and a moving contact assembly. The static contact is fixedly arranged on the shell; the moving contact assembly is rotatably mounted on the shell and comprises a rotating shaft and a moving contact body, the rotating shaft is rotatably connected to the shell, the moving contact body is rotatably connected to the rotating shaft, one end, far away from the rotating shaft, of the moving contact body can be in contact with the static contact, and the moving contact body is matched with the rotating shaft to form an accommodating cavity; a matching gap exists between the moving contact body and the rotating shaft, the accommodating cavity is communicated with the matching gap, and the accommodating cavity is used for accommodating particles. According to the circuit breaker provided by the invention, the possibility that particulate matters are clamped into the matching gap of the moving contact body and the rotating shaft can be reduced, the contact reliability of the moving contact body and the static contact is ensured, and the use reliability of the circuit breaker is further ensured.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more particularly to a circuit breaker. Background Technology

[0002] Circuit breakers provide protection for circuits electrically connected to them. In the event of an overload, short circuit, or other abnormal condition, the moving contact assembly of the circuit breaker moves relative to the stationary contact, separating the moving contact assembly from the stationary contact. This puts the circuit breaker in the open state, thereby breaking the circuit and preventing further escalation of the fault.

[0003] During the separation of the moving contact assembly from the stationary contact, an electric arc is generated between the moving contact assembly and the stationary contact. As the arc is discharged from the circuit breaker, it burns the internal structure of the circuit breaker and generates particulate matter. This particulate matter moves with the arc inside the circuit breaker and may become stuck inside the moving contact assembly, affecting the contact reliability between the moving contact assembly and the stationary contact, and thus affecting the performance of the circuit breaker. Utility Model Content

[0004] This application provides a circuit breaker that can reduce the possibility of particles getting stuck in the mating gap between the moving contact body and the rotating shaft, ensuring the contact reliability between the moving contact body and the stationary contact, and thus ensuring the reliability of the circuit breaker in use.

[0005] In a first aspect, this application provides a circuit breaker, which includes a housing, a stationary contact, and a moving contact assembly. The stationary contact is fixedly mounted in the housing. The moving contact assembly is rotatably mounted in the housing and includes a rotating shaft and a moving contact body. The rotating shaft is rotatably connected to the housing, and the moving contact body is rotatably connected to the rotating shaft. The end of the moving contact body away from the rotating shaft can contact the stationary contact. The moving contact body and the rotating shaft cooperate to form a receiving cavity. There is a fitting gap between the moving contact body and the rotating shaft, and the receiving cavity communicates with the fitting gap. The receiving cavity is used to contain particulate matter.

[0006] In this application example, the housing provides a mounting carrier for the stationary and moving contact assemblies. The moving contact assembly is rotatably mounted on the housing, and the contact state between the moving contact assembly and the stationary contact can be adjusted according to the rotation of the moving contact assembly.

[0007] The moving contact assembly includes a rotating shaft and a moving contact body, the moving contact body being rotatable relative to the rotating shaft. During the separation of the moving contact assembly from the stationary contact, the moving contact body and the rotating shaft rotate relative to the housing, and the moving contact body also rotates relative to the rotating shaft. Since the end of the moving contact body furthest from the rotating shaft can contact the stationary contact, and a receiving cavity is located between the moving contact body and the rotating shaft, the mating gap between the moving contact body and the rotating shaft near the stationary contact increases during separation. Particles may enter between the moving contact body and the rotating shaft through this mating gap. However, because the receiving cavity is connected to the mating gap between the moving contact body and the rotating shaft, particles can enter the receiving cavity from the mating gap between the moving contact body and the rotating shaft, reducing the possibility of particles getting stuck in the mating gap between the moving contact body and the rotating shaft, ensuring the contact reliability between the moving contact body and the stationary contact, and thus ensuring the operational reliability of the circuit breaker.

[0008] In some possible implementations, the receiving cavity includes a first receiving cavity, the rotating shaft includes a connected mounting cavity and a first rotating groove, the rotation center of the moving contact body is located in the mounting cavity, the mounting cavity and the receiving cavity are spaced apart, the moving contact body passes through the first rotating groove, and the moving contact body is movable in the first rotating groove, the groove wall of the first rotating groove near the bottom wall of the housing is provided with a first receiving groove, and the first receiving groove and the moving contact body cooperate to form a first receiving cavity.

[0009] In this application example, the mounting cavity provides installation space for mounting the moving contact body to the rotating shaft. The first rotating groove communicates with the mounting cavity, allowing the moving contact body to pass through the rotating shaft and rotate relative to the bottom wall of the housing. A first receiving groove is provided on the groove wall of the first rotating groove near the bottom wall of the housing. When the moving contact assembly is separated from the stationary contact, the first receiving groove may separate from the moving contact body, and particles may enter the first receiving groove from between the rotating shaft and the moving contact body. This reduces the possibility that, when the moving contact assembly is in contact with the stationary contact, particles located between the rotating shaft and the moving contact body would prevent reliable contact between the moving contact body and the stationary contact, thus ensuring the reliability of the circuit breaker.

[0010] In some possible implementations, the size of the first receiving groove is smaller than the size of the moving contact body along the rotation center axis of the moving contact body.

[0011] In this application example, by setting the size of the first receiving groove to be smaller than the size of the moving contact body along the rotation center axis of the moving contact body, the possibility of the moving contact body entering the first receiving groove from the first rotation groove can be reduced or even avoided. This can reduce the possibility of the moving contact body occupying the receiving space provided by the first receiving groove for particles, further reducing the possibility of particles getting stuck between the moving contact body and the rotating shaft, making it impossible for the moving contact body and the stationary contact to make reliable contact, and further ensuring the reliability of the circuit breaker.

[0012] In some possible implementations, the width of the first receiving groove decreases along the direction away from the stationary contact.

[0013] In this example, the width of the first receiving groove decreases along the direction away from the stationary contact. Since the particles move from the stationary contact toward the rotating shaft, the particles can first enter the wider part of the first receiving groove during the process of entering the first receiving groove, so that more particles can enter the first receiving groove, further reducing the possibility of particles getting stuck between the moving contact body and the rotating shaft, and further improving the reliability of the contact between the moving contact body and the stationary contact.

[0014] In some possible implementations, the receiving cavity further includes a second receiving cavity, and the moving contact body is provided with a second receiving groove on the bottom wall side facing the housing. The second receiving groove cooperates with the groove wall of the first rotating groove to form a second receiving cavity.

[0015] In this example, the moving contact body has a second receiving groove on the bottom wall side facing the housing. When the moving contact assembly is separated from the stationary contact, the second receiving groove may separate from the rotating shaft, and particles may enter the second receiving groove from between the rotating shaft and the moving contact body. When the moving contact assembly is in contact with the stationary contact, the second receiving groove and the groove wall of the first rotating groove cooperate to form a second receiving cavity. Particles can be located in the second receiving cavity, which can reduce the possibility that particles are located between the rotating shaft and the moving contact body, making it impossible for the moving contact body to reliably contact the stationary contact, thus ensuring the reliability of the circuit breaker.

[0016] In some possible implementations, the second receiving cavity is connected to the first receiving cavity.

[0017] In this example, by setting the second receiving cavity to be connected to the first receiving cavity, during the use of the circuit breaker, particles can move from the second receiving cavity to the first receiving cavity under the action of gravity or electric arc. Alternatively, particles can also move from the second receiving cavity to the first receiving cavity under the action of electric arc. This further reduces the possibility of particles getting stuck in the gap between the moving contact body and the rotating shaft, ensuring the contact reliability between the moving contact assembly and the stationary contact, and ensuring the reliability of the circuit breaker.

[0018] In some possible implementations, the second receiving groove has a first guide surface on the groove wall near the stationary contact. When the moving contact body is in contact with the stationary contact, the first guide surface extends near the bottom wall of the housing in the direction close to the stationary contact.

[0019] A first guide surface is provided on the groove wall of the second receiving groove near the stationary contact. When the moving contact body is in contact with the stationary contact, the first guide surface extends near the bottom wall of the housing along the direction close to the stationary contact, forming an obtuse angle between the first guide surface and the bottom wall of the second receiving groove. During the separation of the moving contact body and the stationary contact, compared to when particles enter the second receiving groove from the groove wall near the stationary contact and form a right angle with the bottom wall of the second receiving groove, the obtuse angle between the first guide surface and the bottom wall of the second receiving groove provides less obstruction to the particles, allowing the particles to enter the second receiving groove more easily, thus improving the efficiency of particle entry into the second receiving groove.

[0020] In some possible implementations, the circuit breaker also includes an arc-extinguishing chamber and a protective plate. The stationary contact is located within the arc-extinguishing chamber, and the end of the moving contact body facing away from the rotating shaft extends into the arc-extinguishing chamber, allowing the moving contact body to contact the stationary contact within the chamber. The protective plate is located on the side of the arc-extinguishing chamber facing the rotating shaft, and the moving contact body passes through the protective plate and extends into the arc-extinguishing chamber.

[0021] In this example, the stationary contact is located within the arc-extinguishing chamber, and the side of the moving contact body facing away from the rotating shaft can extend into the arc-extinguishing chamber and contact the stationary contact. Since the baffle is located on the side of the arc-extinguishing chamber facing the rotating shaft, it is positioned between the stationary contact and the rotating shaft. During the separation of the moving contact body from the stationary contact, some particles generated can impact the baffle as they move towards the rotating shaft, thus becoming stuck on the side of the baffle facing away from the rotating shaft. This reduces the likelihood of particles reaching the mating gap between the rotating shaft and the moving contact body. The baffle, in conjunction with the receiving cavity, further reduces the possibility of particles becoming stuck in the mating gap between the moving contact body and the rotating shaft, ensuring reliable contact between the moving contact assembly and the stationary contact assembly.

[0022] In some possible implementations, the arc-extinguishing chamber includes multiple arc-extinguishing grids arranged along the direction toward the bottom wall of the housing. The protective plate includes an angled protective body and a bent portion. The protective body is fixedly connected to the side of the arc-extinguishing chamber facing the rotating shaft, and the bent portion abuts against the side of the fixed grid facing the bottom wall of the housing. The fixed grid is the arc-extinguishing grid that faces away from the bottom wall of the housing among the multiple arc-extinguishing grids.

[0023] In this example, the protective plate includes an angled protective body and a bent portion. The protective body is fixedly connected to the side of the arc-extinguishing chamber facing the rotating shaft, allowing some particles to impact the protective body and reducing the possibility of particles reaching the gap between the moving contact body and the rotating shaft from the arc-extinguishing chamber towards the rotating shaft. The bent portion abuts against the side of the fixed grid plate facing the bottom wall of the housing. Therefore, the bent portion can block the gap between the arc-extinguishing chamber and the protective body, reducing the possibility of particles moving from between the arc-extinguishing chamber and the protective body to other structures of the circuit breaker, further ensuring the reliability of the circuit breaker.

[0024] In some possible implementations, the arc-extinguishing chamber is provided with a first connecting structure on the side facing the rotating shaft, and the protective body is provided with a second connecting structure, with the first connecting structure and the second connecting structure being snapped together.

[0025] In this example, the first connecting structure is located in the arc-extinguishing chamber, and the second connecting structure is located in the protective body, which is part of the protective plate. Therefore, the connection between the protective plate and the arc-extinguishing chamber can be achieved through the connection between the first and second connecting structures. Furthermore, the reliability of the connection between the protective plate and the arc-extinguishing chamber is further ensured by the contact between the bent portion of the protective plate and the arc-extinguishing chamber structure. Attached Figure Description

[0026] Figure 1 This is a first-view structural schematic diagram of a partial circuit breaker provided as an example of this application.

[0027] Figure 2 This is a structural schematic diagram of a partial circuit breaker from a second perspective, provided as an example of this application.

[0028] Figure 3 for Figure 2 Sectional view at point AA.

[0029] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0030] Figure 5 This is a schematic diagram of a rotating shaft provided as an example of this application.

[0031] Figure 6 This is a schematic diagram of the structure of a moving contact body provided as an example of this application.

[0032] Figure 7 This is a schematic diagram illustrating the combination of an arc-extinguishing chamber and a protective plate, as an example of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Circuit breaker; 110. Housing; 120. Moving contact assembly; 121. Rotating shaft; 1211. First rotating groove; 1212. First receiving groove; 122. Moving contact body; 1221. Second receiving groove; 123. Receiving cavity; 1231. First receiving cavity; 1232. Second receiving cavity; 130. Protective plate; 131. Second connecting structure; 140. Arc extinguishing chamber; 141. First connecting structure; 150. Stationary contact. Detailed Implementation

[0035] To make the purpose, technical solutions, and advantages of the examples in this application clearer, the technical solutions in the examples of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described examples are only a part of the examples in this application, not all of them. Based on the examples in this application, all other examples obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terms used herein in the description of the application are for the purpose of describing particular examples only and are not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the description, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0037] In this document, the term "example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one example of this application. The appearance of the phrase "example" in various places in the specification does not necessarily refer to the same example, nor is it a separate or alternative example mutually exclusive with other examples. It will be explicitly and implicitly understood by those skilled in the art that the examples described herein can be combined with other examples.

[0038] 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.

[0039] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the circuit breaker in this application.

[0040] 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.

[0041] 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).

[0042] In the description of this application, it should be noted that, unless otherwise explicitly 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, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; 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 based on the specific circumstances.

[0043] Circuit breakers provide protection for circuits electrically connected to them. In the event of an overload, short circuit, or other abnormal condition, the moving contact assembly of the circuit breaker moves relative to the stationary contact, separating the moving contact assembly from the stationary contact. This puts the circuit breaker in the open state, thereby breaking the circuit and preventing further escalation of the fault.

[0044] During the separation of the moving contact assembly from the stationary contact, an electric arc is generated between the moving contact assembly and the stationary contact. As the arc is discharged from the circuit breaker, the arc burns the internal structure of the circuit breaker and generates particulate matter, which moves inside the circuit breaker with the arc.

[0045] The moving contact assembly includes a rotating shaft and a moving contact body rotatably connected. During the separation of the moving contact assembly from the stationary contact, the moving contact body also rotates relative to the rotating shaft. Since the stationary contact is fixed to the bottom wall of the housing, during separation, the moving contact assembly rotates in a direction away from the bottom wall of the housing. The mating gap between the moving contact body and the rotating shaft near the bottom wall of the housing increases with the rotation of the moving contact body. Particles may become stuck between the moving contact body and the rotating shaft, preventing the moving contact body from reliably engaging with the stationary contact, thus affecting the contact reliability of the moving contact assembly and the stationary contact, and consequently affecting the performance of the circuit breaker.

[0046] Based on the above, this application provides an example of a circuit breaker.

[0047] To enable those skilled in the art to better understand the present application, the circuit breaker provided in the example of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0048] For example, this application provides a circuit breaker. Figure 1 This application provides a first-view structural schematic diagram of a partial circuit breaker as an example. Figure 2 This application provides a structural schematic diagram of a partial circuit breaker from a second perspective. Figure 3 for Figure 2 Sectional view at point AA. Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0049] Please refer to Figures 1-4 The circuit breaker 100 includes a housing 110, a stationary contact 150, and a moving contact assembly 120. The stationary contact 150 is fixedly mounted on the housing 110. The moving contact assembly 120 is rotatably mounted on the housing 110. The moving contact assembly 120 includes a rotating shaft 121 and a moving contact body 122. The rotating shaft 121 is rotatably connected to the housing 110, and the moving contact body 122 is rotatably connected to the rotating shaft 121. One end of the moving contact body 122 away from the rotating shaft 121 can contact the stationary contact 150. The moving contact body 122 and the rotating shaft 121 cooperate to form a receiving cavity 123. There is a fitting gap between the moving contact body 122 and the rotating shaft 121. The receiving cavity 123 communicates with the fitting gap and is used to receive particulate matter.

[0050] The housing 110 is made of insulating material, such as polyvinyl chloride, polycarbonate (also known as PC plastic), etc.

[0051] The housing 110, made of insulating material, can reduce the possibility of current escaping from the housing 110 to the outside, thereby ensuring the safety of the circuit breaker 100.

[0052] The stationary contact 150 can be fixedly connected to the housing 110 by means of threaded connection, riveting, fusion welding or other methods.

[0053] The moving contact assembly 120 is rotatably connected within the housing 110. The moving contact assembly 120 includes a mating rotating shaft 121 and a moving contact body 122. The rotating shaft 121 is connected to the housing 110 via a hole-shaft mating mechanism. The housing 110 is provided with a limiting structure such as a groove, allowing the rotating shaft 121 to engage with the limiting structure to reduce the amplitude of the rotating shaft 121's wobbling relative to the housing 110.

[0054] The circuit breaker 100 may include a set of stationary contacts 150 and moving contact assemblies 120. The circuit breaker 100 may also include two, three, four or more sets of stationary contacts 150 and moving contact assemblies 120. This application example does not specifically limit this.

[0055] The rotating shaft 121 can be a hollow structural component, with part of the moving contact body 122 located inside the rotating shaft 121. The moving contact body 122 can be connected to the rotating shaft 121 through a hole-shaft fit. The end of the moving contact body 122 facing away from the rotating shaft 121 can contact the stationary contact 150, and the end of the stationary contact 150 facing away from the rotating shaft 121 can also be separated from the stationary contact 150.

[0056] The circuit breaker 100 also includes an operating mechanism, which can directly or indirectly apply force to the moving contact assembly 120, causing the moving contact body 122 in the moving contact assembly 120 to contact the stationary contact 150. At this time, the circuit breaker 100 is in the closed state, and the circuit electrically connected to the circuit breaker 100 is in the continuous state. The moving contact assembly 120 can also be separated from the stationary contact 150 by the operating mechanism, at which point the circuit breaker 100 is in the open state. Alternatively, the moving contact assembly 120 can be separated from the stationary contact 150 by structural components such as thermal elements, at which point the circuit breaker 100 is in the tripped state. Regardless of whether the circuit breaker 100 is in the open or tripped state, the circuit connected to the circuit breaker 100 is in the open state.

[0057] During the separation of the moving contact assembly 120 from the stationary contact 150, an electric arc is generated between the moving contact assembly 120 and the stationary contact 150. As the electric arc moves within the circuit breaker 100, it burns the housing 110 and other structural components within the housing 110, generating particulate matter. The particulate matter moves within the housing 110 along with the electric arc.

[0058] The moving contact body 122 and the rotating shaft 121 cooperate to form a receiving cavity 123. The receiving cavity 123 can be configured in various ways. For example, the moving contact body 122 may have a groove structure on the side facing the rotating shaft 121, and this groove structure can fit against the rotating shaft 121, forming the receiving cavity 123. Alternatively, the groove structure may be located on the side of the rotating shaft 121 that contacts the moving contact body 122, forming the receiving cavity 123. Alternatively, groove structures may be provided on both the moving contact body 122 and the rotating shaft 121. There may be only one receiving cavity 123, or there may be multiple spaced sub-receiving cavities 123. This application example does not impose specific limitations on this.

[0059] In this application example, the housing 110 provides a mounting carrier for the stationary contact 150 and the moving contact assembly 120. The moving contact assembly 120 is rotatably mounted on the housing 110, and the contact state between the moving contact assembly 120 and the stationary contact 150 can be adjusted according to the rotation of the moving contact assembly 120.

[0060] The moving contact assembly 120 includes a rotating shaft 121 and a moving contact body 122, which is rotatable relative to the rotating shaft 121. During the separation of the moving contact assembly 120 from the stationary contact 150, the moving contact body 122 and the rotating shaft 121 rotate relative to the housing 110, and the moving contact body 122 also rotates relative to the rotating shaft 121. Since the end of the moving contact body 122 away from the rotating shaft 121 can contact the stationary contact 150, and the receiving cavity 123 is located between the moving contact body 122 and the rotating shaft 121, the mating gap between the moving contact body 122 and the rotating shaft 121 near the stationary contact 150 increases during the separation process. Particles may enter the space between the moving contact body 122 and the rotating shaft 121 through this mating gap. Furthermore, since the receiving cavity 123 is connected to the mating gap between the moving contact body 122 and the rotating shaft 121, particles can enter the receiving cavity 123 from the mating gap between the moving contact body 122 and the rotating shaft 121, reducing the possibility of particles getting stuck in the mating gap between the moving contact body 122 and the rotating shaft 121, ensuring the contact reliability between the moving contact body 122 and the stationary contact 150, and thus ensuring the reliability of the circuit breaker 100 in use.

[0061] Based on the circuit breaker 100 provided in the example above, Figure 5 Please refer to the schematic diagram of a rotating shaft provided as an example in this application. Figure 4 and Figure 5 The receiving cavity 123 includes a first receiving cavity 1231. The rotating shaft 121 includes a connected mounting cavity and a first rotating groove 1211. The rotation center of the moving contact body 122 is located in the mounting cavity. The mounting cavity and the receiving cavity 123 are spaced apart. The moving contact body 122 passes through the first rotating groove 1211 and is movable in the first rotating groove 1211. The first rotating groove 1211 is provided with a first receiving groove 1212 near the bottom wall of the housing 110. The first receiving groove 1212 and the moving contact body 122 cooperate to form the first receiving cavity 1231.

[0062] The mounting cavity makes the rotating shaft 121 a hollow structure. The moving contact body 122 is connected to the mounting cavity through a hole-shaft fit, and the rotation center of the moving contact body 122 is located inside the mounting cavity.

[0063] The first rotating groove 1211 is located on the side of the rotating shaft 121 facing the stationary contact 150, and the first rotating groove 1211 communicates with the mounting cavity. Based on this, the moving contact body 122 can extend into the mounting cavity and protrude from the first rotating groove 1211 to the outside of the rotating shaft 121. The arrangement of the first rotating groove 1211 is similar to that of rotating grooves in the prior art, and will not be described in detail here. By providing the first rotating groove 1211, the moving contact body 122 can rotate relative to the rotating shaft 121 in a direction away from or towards the bottom wall of the housing 110, thereby allowing the contact state between the moving contact body 122 and the stationary contact 150 to switch between contact and non-contact.

[0064] When the moving contact assembly 120 is in contact with the stationary contact 150, the moving contact body 122 contacts the groove wall of the first rotating groove 1211 near the bottom wall of the housing 110. When the moving contact assembly 120 rotates to the position where it is at its maximum distance from the stationary contact 150, the moving contact body 122 may contact the groove wall of the first rotating groove 1211 away from the bottom wall of the housing 110, or there may be a gap between the moving contact body 122 and the groove wall of the first rotating groove 1211 away from the bottom wall of the housing 110. This application example does not impose specific limitations on this.

[0065] The first rotating groove 1211 has a first receiving groove 1212 on the groove wall near the bottom wall of the housing 110. There may be only one first receiving groove 1212 or multiple first receiving grooves 1212. The cross-section of the first receiving groove 1212 may be circular, triangular, rectangular or other shapes. This application example does not make specific restrictions on this.

[0066] When the moving contact body 122 is in contact with the stationary contact 150, the moving contact body 122 contacts the groove wall of the first rotating groove 1211 near the bottom wall of the housing 110. At this time, the first receiving groove 1212 and the moving contact body 122 can cooperate to form a first receiving cavity 1231. The first receiving cavity 1231 can be a closed cavity, or it can be a cavity with an opening. This application example does not specifically limit this. The first receiving cavity 1231 is the sub-receiving cavity 123 mentioned above.

[0067] In this application example, the mounting cavity provides installation space for the moving contact body 122 to be mounted to the rotating shaft 121. The first rotating groove 1211 communicates with the mounting cavity, allowing the moving contact body 122 to pass through the rotating shaft 121, and the moving contact body 122 can rotate relative to the bottom wall of the housing 110. The groove wall of the first rotating groove 1211 near the bottom wall of the housing 110 is provided with a first receiving groove 1212. When the moving contact assembly 120 is separated from the stationary contact 150, the first receiving groove 1212 may separate from the moving contact body 122, and particles may enter the first receiving groove 1212 from between the rotating shaft 121 and the moving contact body 122. This reduces the possibility that when the moving contact assembly 120 is in contact with the stationary contact 150, particles located between the rotating shaft 121 and the moving contact body 122 may prevent the moving contact body 122 from reliably contacting the stationary contact 150, thus ensuring the reliability of the circuit breaker 100.

[0068] Based on the circuit breaker 100 provided in the example above, please refer to... Figure 5 Along the rotation center axis of the moving contact body 122, the size of the first receiving groove 1212 is smaller than the size of the moving contact body 122.

[0069] The direction of the rotation center axis of the moving contact body 122 refers to the arrangement direction of the two side walls of the housing 110 connected to both ends of the rotating shaft 121.

[0070] In circuit breaker 100, such as Figure 5 When placed, along the rotation center axis of the moving contact body 122, the size of the first receiving groove 1212 is smaller than the size of the moving contact body 122. This can be understood as the width of the first receiving groove 1212 being smaller than the width of the moving contact body 122.

[0071] In this application example, by setting the size of the first receiving groove 1212 to be smaller than the size of the moving contact body 122 along the rotation center axis of the moving contact body 122, the possibility of the moving contact body 122 entering the first receiving groove 1212 from the first rotation groove 1211 can be reduced or even avoided. This can reduce the possibility of the moving contact body 122 occupying the receiving space provided by the first receiving groove 1212 for particles, further reducing the possibility of particles getting stuck between the moving contact body 122 and the rotating shaft 121, making it impossible for the moving contact body 122 and the stationary contact 150 to make reliable contact, and further ensuring the reliability of the circuit breaker 100.

[0072] Based on the circuit breaker 100 provided in the above example, the width of the first receiving groove 1212 decreases in the direction away from the stationary contact 150.

[0073] The width of the first receiving groove 1212 refers to the size of the first receiving groove 1212 along the rotation center axis of the moving contact body 122.

[0074] Along the direction away from the stationary contact 150, the width of the first receiving groove 1212 may gradually decrease. The first receiving groove 1212 may also include multiple sub-grooves, and along the direction away from the stationary contact 150, the width of the multiple sub-grooves decreases sequentially. This application example does not impose specific limitations on this.

[0075] In this example, the width of the first receiving groove 1212 decreases along the direction away from the stationary contact 150. Since the particles move from the stationary contact 150 toward the rotating shaft 121, the particles can first enter the wider part of the first receiving groove 1212 during the process of entering the first receiving groove 1212, so that more particles can enter the first receiving groove 1212, further reducing the possibility of particles getting stuck between the moving contact body 122 and the rotating shaft 121, and further improving the reliability of the contact between the moving contact body 122 and the stationary contact 150.

[0076] Based on the circuit breaker 100 provided in the example above, Figure 6 For a structural schematic diagram of a moving contact body provided as an example of this application, please refer to... Figure 3 , Figure 4 and Figure 6 The receiving cavity 123 also includes a second receiving cavity 1232. The moving contact body 122 is provided with a second receiving groove 1221 on the bottom wall side facing the housing 110. The second receiving groove 1221 cooperates with the groove wall of the first rotating groove 1211 to form the second receiving cavity 1232.

[0077] The moving contact body 122 is provided with a second receiving groove 1221 on the bottom wall side facing the housing 110. There may be only one second receiving groove 1221 or multiple second receiving grooves 1221. The cross-section of the second receiving groove 1221 may be circular, triangular, rectangular or other shapes. This application example does not make specific limitations in this regard.

[0078] When the moving contact body 122 is in contact with the stationary contact 150, the moving contact body 122 contacts the groove wall of the first rotating groove 1211 near the bottom wall of the housing 110. At this time, the second receiving groove 1221 cooperates with the groove wall of the first rotating groove 1211 to form a second receiving cavity 1232. The second receiving cavity 1232 can be a closed cavity or an open cavity. This application example does not specifically limit this. The second receiving cavity 1232 is the sub-receiving cavity 123 mentioned above.

[0079] This application may have only a first receiving cavity 1231, only a second receiving cavity 1232, or both a first receiving cavity 1231 and a second receiving cavity 1232. When both a first receiving cavity 1231 and a second receiving cavity 1232 are provided, they may be spaced apart or connected; this application example does not impose specific limitations in this regard.

[0080] In this application example, the moving contact body 122 is provided with a second receiving groove 1221 on the bottom wall side facing the housing 110. When the moving contact assembly 120 is separated from the stationary contact 150, the second receiving groove 1221 may separate from the rotating shaft 121, and particles may enter the second receiving groove 1221 from between the rotating shaft 121 and the moving contact body 122. When the moving contact assembly 120 is in contact with the stationary contact 150, the second receiving groove 1221 cooperates with the groove wall of the first rotating groove 1211 to form a second receiving cavity 1232. The particles are located in the second receiving cavity 1232, which can reduce the possibility that the particles are located between the rotating shaft 121 and the moving contact body 122, making it impossible for the moving contact body 122 to reliably contact the stationary contact 150, thus ensuring the reliability of the circuit breaker 100.

[0081] Based on the circuit breaker 100 provided in the example above, please refer to... Figure 4 The second receiving cavity 1232 is connected to the first receiving cavity 1231.

[0082] When the second receiving cavity 1232 is connected to the first receiving cavity 1231, the projection of the second receiving cavity 1232 can completely coincide with the projection of the first receiving cavity 1231 along the direction toward the bottom wall of the housing 110, or the projection of the first receiving cavity 1231 and the projection of the second receiving cavity 1232 can partially coincide. This application example does not impose specific restrictions on this, as long as the first receiving cavity 1231 and the second receiving cavity 1232 are connected.

[0083] In this application example, by setting the second receiving cavity 1232 to be connected to the first receiving cavity 1231, during the use of the circuit breaker 100, particles can move from the second receiving cavity 1232 to the first receiving cavity 1231 under the action of gravity or electric arc. Alternatively, particles can also move from the second receiving cavity 1232 to the first receiving cavity 1231 under the action of electric arc. This further reduces the possibility of particles getting stuck in the gap between the moving contact body 122 and the rotating shaft 121, ensuring the contact reliability between the moving contact assembly 120 and the stationary contact 150, and ensuring the reliability of the circuit breaker 100.

[0084] Based on the circuit breaker 100 provided in the example above, please refer to... Figure 3 and Figure 6The second receiving groove 1221 has a first guide surface on the groove wall near the stationary contact 150. When the moving contact body 122 is in contact with the stationary contact 150, the first guide surface extends near the bottom wall of the housing 110 in the direction close to the stationary contact 150.

[0085] A first guide surface located on the groove wall of the second receiving groove 1221 near the stationary contact 150 extends along the direction close to the stationary contact 150, near the bottom wall of the housing 110, when the moving contact body 122 is in contact with the stationary contact 150, forming an obtuse angle between the first guide surface and the bottom wall of the second receiving groove 1221. During the separation of the moving contact body 122 and the stationary contact 150, compared to the situation where particles enter the second receiving groove 1221 from the groove wall near the stationary contact 150 and form a right angle with the bottom wall of the second receiving groove 1221, the obtuse angle between the first guide surface and the bottom wall of the second receiving groove 1221 results in less obstruction of particles, allowing particles to enter the second receiving groove 1221 more easily and improving the efficiency of particle entry into the second receiving groove 1221.

[0086] Based on the circuit breaker 100 provided in the example above, please refer to... Figure 3 and Figure 6 The second receiving groove 1221 has a second guide surface on the groove wall away from the stationary contact 150. When the moving contact body 122 is in contact with the stationary contact 150, the second guide surface extends close to the bottom wall of the housing 110 in the direction close to the stationary contact 150.

[0087] A second guide surface located on the groove wall of the second receiving groove 1221 away from the stationary contact 150 extends close to the bottom wall of the housing 110 in a direction close to the stationary contact 150 when the moving contact body 122 is in contact with the stationary contact 150, forming an acute angle between the second guide surface and the bottom wall of the second receiving groove 1221. During the separation of the moving contact body 122 and the stationary contact 150, compared to particles forming a right angle between the groove wall of the second receiving groove 1221 away from the stationary contact 150 and the bottom wall of the second receiving groove 1221, the second receiving groove 1221, with its acute angle between the second guide surface and the bottom wall, provides greater protection for particles. This reduces the likelihood of particles leaving the second receiving groove 1221, further decreasing the possibility of particles getting stuck in the gap between the moving contact body 122 and the rotating shaft 121, thus ensuring the contact reliability of the moving contact assembly 120 and the stationary contact 150 assembly.

[0088] Based on the circuit breaker 100 provided in the example above, please refer to... Figures 1-3The circuit breaker 100 also includes an arc-extinguishing chamber 140 and a protective plate 130. A stationary contact 150 is disposed within the arc-extinguishing chamber 140, and the moving contact body 122 extends into the arc-extinguishing chamber 140 from the end opposite to the rotating shaft 121. The moving contact body 122 can contact the stationary contact 150 within the arc-extinguishing chamber 140. The protective plate 130 is disposed on the side of the arc-extinguishing chamber 140 facing the rotating shaft 121, and the moving contact body 122 passes through the protective plate 130 and extends into the arc-extinguishing chamber 140.

[0089] The arc-extinguishing chamber 140 includes an arc inlet, which is U-shaped. The stationary contact 150 is located in the U-shaped arc inlet, and the end of the moving contact body 122 away from the rotating shaft 121 can extend into the arc inlet and rotate relative to the stationary contact 150, so that the moving contact body 122 contacts or separates from the stationary contact 150.

[0090] The protective panel 130 may be made of materials such as DuPont cardboard, polyvinyl chloride, polycarbonate, and nylon, and this application example does not impose specific limitations on this.

[0091] The protective plate 130 has a second rotating groove in the middle, which is connected to the first rotating groove 1211. The moving contact body 122 can pass through the first rotating groove 1211 and the second rotating groove and extend into the arc-extinguishing chamber 140 to contact the stationary contact 150.

[0092] The protective plate 130 can be connected to the side of the arc-extinguishing chamber 140 facing the rotating shaft 121 by snap-fitting, bonding, fusion bonding or other connection methods. The protective plate 130 can be a straight plate structure, or it can be composed of multiple plates arranged at an angle. This application example does not impose specific limitations on this.

[0093] In this example, the stationary contact 150 is disposed within the arc-extinguishing chamber 140, and the side of the moving contact body 122 facing away from the rotating shaft 121 can extend into the arc-extinguishing chamber 140 to contact the stationary contact 150. Since the baffle is disposed on the side of the arc-extinguishing chamber 140 facing the rotating shaft 121, it is positioned between the stationary contact 150 and the rotating shaft 121. During the separation process of the moving contact body 122 and the stationary contact 150, some particles generated can impact the baffle as they move towards the rotating shaft 121, thus becoming stuck on the side of the baffle facing away from the rotating shaft 121, reducing the possibility of particles reaching the mating gap between the rotating shaft 121 and the moving contact body 122. The baffle, in conjunction with the receiving cavity 123, further reduces the possibility of particles becoming stuck between the moving contact body 122 and the rotating shaft 121, ensuring the contact reliability of the moving contact assembly 120 and the stationary contact 150 assembly.

[0094] Based on the circuit breaker 100 provided in the above example, the arc-extinguishing chamber 140 includes a plurality of arc-extinguishing grids arranged along the direction toward the bottom wall of the housing 110. The protective plate 130 includes an angled protective body and a bent portion. The protective body is fixedly connected to the side of the arc-extinguishing chamber 140 facing the rotating shaft 121, and the bent portion abuts against the side of the fixed grid facing the bottom wall of the housing 110. The fixed grid is the arc-extinguishing grid that is away from the bottom wall of the housing 110 among the plurality of arc-extinguishing grids.

[0095] Multiple arc-extinguishing grids are arranged along the direction toward the bottom wall of the housing 110. This can be understood as the arrangement direction of the multiple arc-extinguishing grids forming an angle with the bottom wall of the housing 110. This angle can be a right angle, an acute angle, or an obtuse angle.

[0096] The arrangement of multiple arc-extinguishing grids can be in a straight line or in a curved line; this application does not impose specific restrictions on this.

[0097] The protective body and the bending part can form a right angle or an obtuse angle. The protective body and the bending part can be bent at an angle under force, or they can be at an angle in their natural state. This application does not impose specific limitations on this.

[0098] The protective body can be connected to the side of the arc-extinguishing chamber 140 facing the rotating shaft 121 by snap-fit, adhesive, fusion bonding or other connection methods.

[0099] The fixed grid plate is the arc-extinguishing grid plate that is furthest from the bottom wall of the housing 110 among multiple arc-extinguishing grid plates.

[0100] In this example, the protective plate 130 includes an angled protective body and a bent portion. The protective body is fixedly connected to the side of the arc-extinguishing chamber 140 facing the rotating shaft 121, allowing some particles to impact the protective body and reducing the possibility of particles reaching the mating gap between the moving contact body 122 and the rotating shaft 121 from the direction of the arc-extinguishing chamber 140 towards the rotating shaft 121. The bent portion abuts against the side of the fixed grid plate facing the bottom wall of the housing 110. Therefore, the bent portion can block the gap between the arc-extinguishing chamber 140 and the protective body, reducing the possibility of particles moving from between the arc-extinguishing chamber 140 and the protective body to other structures of the circuit breaker 100, further ensuring the reliability of the circuit breaker 100.

[0101] Based on the circuit breaker 100 provided in the example above, Figure 7 A schematic diagram illustrating the fit between the arc-extinguishing chamber and the protective plate, as provided in this application, is shown below. Figure 7 The arc-extinguishing chamber 140 is provided with a first connecting structure 141 on the side facing the rotating shaft 121, and the protective body is provided with a second connecting structure 131. The first connecting structure 141 and the second connecting structure 131 are engaged.

[0102] The first connecting structure 141 can be a connecting protrusion, and the second connecting structure 131 can be a connecting groove or a connecting hole. The connecting protrusion can connect with the connecting groove, or the connecting protrusion can connect with the connecting hole. Alternatively, the first connecting structure 141 can be a connecting groove or a connecting hole, and the second connecting structure 131 can be a connecting protrusion. In this case, the connecting protrusion can connect with the connecting groove, or the connecting protrusion can connect with the connecting hole. This application does not impose specific limitations on this, as long as the first connecting structure 141 and the second connecting structure 131 are connected.

[0103] In this example, the first connecting structure 141 is disposed in the arc-extinguishing chamber 140, and the second connecting structure 131 is disposed in the protective body, which is part of the protective plate 130. Therefore, the connection between the protective plate 130 and the arc-extinguishing chamber 140 can be achieved through the connection of the first connecting structure 141 and the second connecting structure 131. Based on the contact between the bent portion of the protective plate 130 and the arc-extinguishing chamber 140 structure, the reliability of the connection between the protective plate 130 and the arc-extinguishing chamber 140 is further ensured.

[0104] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A circuit breaker characterized by, include: case; The stationary contact is fixedly installed in the housing; A moving contact assembly is rotatably mounted on the housing. The moving contact assembly includes a rotating shaft and a moving contact body. The rotating shaft is rotatably connected to the housing, and the moving contact body is rotatably connected to the rotating shaft. One end of the moving contact body away from the rotating shaft can contact the stationary contact. The moving contact body and the rotating shaft cooperate to form a receiving cavity. There is a fitting gap between the moving contact body and the rotating shaft. The receiving cavity communicates with the fitting gap. The receiving cavity is used to contain particulate matter.

2. The circuit breaker of claim 1, wherein, The receiving cavity includes a first receiving cavity, the rotating shaft includes a connected mounting cavity and a first rotating groove, the rotation center of the moving contact body is located in the mounting cavity, the mounting cavity and the receiving cavity are spaced apart, the moving contact body passes through the first rotating groove, and the moving contact body is movable in the first rotating groove, the groove wall of the first rotating groove near the bottom wall of the housing is provided with a first receiving groove, and the first receiving groove and the moving contact body cooperate to form the first receiving cavity.

3. The circuit breaker of claim 2, wherein, Along the rotation center axis of the moving contact body, the size of the first receiving groove is smaller than the size of the moving contact body.

4. The circuit breaker of claim 2, wherein, The width of the first receiving groove decreases in the direction away from the stationary contact.

5. The circuit breaker of any of claims 2-4, wherein, The receiving cavity further includes a second receiving cavity. The moving contact body is provided with a second receiving groove on the side facing the bottom wall of the housing. The second receiving groove cooperates with the groove wall of the first rotating groove to form the second receiving cavity.

6. The circuit breaker according to claim 5, characterized in that, The second receiving cavity is connected to the first receiving cavity.

7. The circuit breaker of claim 5, wherein, The second receiving groove has a first guide surface on the groove wall near the stationary contact. When the moving contact body is in contact with the stationary contact, the first guide surface extends near the bottom wall of the housing along the direction close to the stationary contact.

8. The circuit breaker of claim 1, wherein, Also includes: An arc-extinguishing chamber is provided in which the stationary contact is disposed, and the end of the moving contact body that is away from the rotating shaft extends into the arc-extinguishing chamber, and the moving contact body can contact the stationary contact in the arc-extinguishing chamber. A protective plate is provided on the side of the arc-extinguishing chamber facing the rotating shaft, and the moving contact body passes through the protective plate and extends into the arc-extinguishing chamber.

9. The circuit breaker according to claim 8, characterized in that, The arc-extinguishing chamber includes a plurality of arc-extinguishing grids, which are arranged along the direction toward the bottom wall of the housing; The protective plate includes a protective body and a bent portion arranged at an angle. The protective body is fixedly connected to the side of the arc-extinguishing chamber facing the rotating shaft. The bent portion abuts against the side of the fixed grid plate facing the bottom wall of the housing. The fixed grid plate is the arc-extinguishing grid plate that is away from the bottom wall of the housing among the plurality of arc-extinguishing grid plates.

10. The circuit breaker of claim 9, wherein, The arc-extinguishing chamber is provided with a first connecting structure on the side facing the rotating shaft, and the protective body is provided with a second connecting structure, with the first connecting structure and the second connecting structure being snapped together.

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