Circuit breaker

Abstract

The utility model relates to the technical field of electrical switches, in particular to a circuit breaker. The circuit breaker provided by the utility model comprises a shell, an operating mechanism and a contact assembly. The operating mechanism comprises an operating handle, a transmission assembly and a push plate. The circuit breaker further comprises a limiting component, the limiting component is configured to be driven by the push plate, and rotation of the operating handle is not affected during normal switching-on and normal switching-off. When the movable contact and the static contact of the contact assembly cannot be separated due to a fault, the operating handle cannot return to a normal opening state due to the influence of the limiting component. Thus, when the movable contact and the static contact of the circuit breaker are welded and cannot be separated, an operator cannot simply consider that the circuit breaker is a normally usable circuit breaker because the operating handle cannot return to a normal opening state. Therefore, an operator can be prevented from mistakenly considering a fault circuit breaker as a normal circuit breaker for use, and potential safety risks are reduced.

Description

Technical Field

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

[0002] Circuit breakers are important electrical devices used to protect circuits from faults such as overloads and short circuits. To help operators quickly identify the status of the circuit breaker, the operating handle is equipped with a status indicator. This indicator points in different directions when the circuit breaker is closed, manually opened, or tripped due to an internal fault. This allows operators to identify the status of the circuit breaker by the direction of the status indicator.

[0003] In some cases, the circuit breaker may have a phenomenon where the moving contact and the static contact are welded and cannot be separated. In this case, the position of the status indicator is required to indicate that the circuit breaker is in a closed state or that the circuit breaker has an internal fault.

[0004] Currently, applying external force to the operating handle of a circuit breaker may cause the direction of the status indicator to change, twisting the status indicator from the closed state or the internal fault trip state to the manual trip state. This can easily mislead the operator, causing them to mistakenly believe that the circuit breaker that has failed is actually in the normal trip state, thereby creating some potential safety risks. Utility Model Content

[0005] The present application provides a circuit breaker that can prevent a status indicator from rotating from a closed state to a normal open state when a moving contact and a static contact of the circuit breaker are welded and cannot be separated, thereby reminding an operator that the circuit breaker is not in a normal open state and avoiding the occurrence of potential safety risks.

[0006] The technical solutions of this utility model are as follows:

[0007] The circuit breaker provided in the present application includes a housing, an operating mechanism and a contact assembly, and the operating mechanism includes an operating handle, a transmission assembly and a push plate. The operating handle is located outside the housing, and the housing includes a mounting plate. The operating handle is mounted on the mounting plate and can rotate relative to the mounting plate. The transmission assembly, the push plate and the contact assembly are located inside the housing. The transmission assembly is configured to control the contact and separation of the moving contact and the static contact in the contact assembly by driving the push plate to rotate under the drive of the operating handle. The circuit breaker also includes a limiting component, which is configured to be driven by the push plate and does not affect the rotation of the operating handle during normal closing and normal opening. When the contact assembly fails and the moving contact and the static contact cannot be separated, the operating handle is affected by the limiting component and cannot return to the normal opening state.

[0008] The circuit breaker provided by the present application also includes a limiting component. The limiting component is configured to be driven by the push plate, and does not affect the rotation of the operating handle during normal closing and normal opening. When the contact assembly fails and the moving contact and the static contact cannot be separated, the operating handle is affected by the limiting component and cannot return to the normal opening state. In this way, even if the moving contact and the static contact of the circuit breaker are welded and cannot be separated, the status indicator of the circuit breaker will display the normal closing state in the absence of external force intervention. In the event of external force intervention, since the operating handle cannot return to the normal opening state, the operator cannot simply assume that the circuit breaker is a normal circuit breaker that can be used. Therefore, it can avoid the operator from mistaking the faulty circuit breaker for a normal circuit breaker and reducing the occurrence of potential safety risks.

[0009] In one possible design, the mounting plate is further provided with a limit hole that extends through the mounting plate and communicates with the rotational region of the protrusion. The limit component includes a first connecting end and a second connecting end, the first connecting end being connected to the push plate, and the second connecting end being located at the limit hole. In the normal open state, the second connecting end does not extend out of the limit hole. During normal closing, the operating handle drives the protrusion to rotate in a first direction. When the protrusion passes the limit hole, the second connecting end, driven by the push plate, can extend out of the limit hole and enter the rotational region of the protrusion. During normal opening, the operating handle drives the protrusion to rotate in a second direction. When the protrusion reaches the limit hole, the second connecting end, driven by the push plate, has retracted into the limit hole, allowing the operating handle to rotate to the normal open state. If the contact assembly malfunctions and the moving and stationary contacts cannot separate, the push plate's rotation is restricted, and the second connecting end cannot retract into the limit hole, thereby blocking the rotation of the protrusion and preventing the operating handle from rotating to the normal open state. The second direction is the opposite of the first direction.

[0010] The circuit breaker provided in this embodiment comprises a protrusion on the operating handle, a matching limiting hole on the mounting plate, and a limiting component provided on the push plate. The protrusion, limiting hole, push plate, and limiting component effectively cooperate by utilizing the characteristics of the push plate during opening and closing. Thus, when the moving and static contacts of the circuit breaker fuse, the operating handle can be prevented from rotating to its normal state by external forces, alerting the operator that the circuit breaker is in an abnormally open state. This prevents the operator from mistaking a faulty circuit breaker for a normal one, reducing potential safety risks. Normal closing and opening of the circuit breaker are not affected.

[0011] In one possible design, the mounting plate includes a normally closed position and a normally open position, with the stopper located between the two positions and proximal to the normal open position. Alternatively, the stopper is located in the normally closed position. In the normally open state, the protrusion is proximal to the stopper, located on the side of the stopper away from the closed position.

[0012] With the circuit breaker provided in this embodiment, the limiting hole is positioned between the normal closing position and the normal opening position and close to the normal opening position. Alternatively, the limiting hole is positioned in the normal closing position. Thus, during the normal closing process, the protrusion is more likely to pass over the limiting hole before the second connection end extends out of the limiting hole, thereby not affecting normal closing. During the normal opening process, the second connection end also has sufficient time to retract into the limiting hole, thereby not affecting normal opening.

[0013] In a possible design, a guide wall is further provided at one end of the limiting hole away from the operating handle.

[0014] With the circuit breaker provided by this embodiment, since the limiting component also rotates slightly when it moves upward or downward as the push plate rotates, the present application further provides a guide wall at the end of the limiting hole away from the operating handle. In this way, the limiting hole can avoid obstruction of the movement of the second connecting end, making it easier for the second connecting end to extend out of or retract into the limiting hole under the drive of the push plate.

[0015] In a possible design, a mounting shaft is fixed on the push plate. The first connecting end has a shaft hole adapted to the mounting shaft.

[0016] The circuit breaker provided by this embodiment provides a mounting shaft on the push plate and provides an axial hole adapted to the mounting shaft at the first connection end. In this way, the limiting component can be movably connected to the push plate and extend or retract into the limiting hole as the push plate rotates.

[0017] In a possible design, the shaft hole is a strip-shaped hole. The mounting shaft is cylindrical, and the width of the shaft hole is adapted to the diameter of the mounting shaft.

[0018] The circuit breaker provided by this embodiment controls the width of the shaft hole so that the width of the shaft hole is adapted to the diameter of the mounting shaft. In this way, the limiting component can rotate around the mounting shaft, and the shaking of the limiting component in the up and down directions is reduced, thereby making it possible to more accurately control the displacement of the limiting component so that the second connection end of the limiting component can accurately extend or retract into the limiting hole.

[0019] In addition, as mentioned above, the movement mode of the push plate is rotation, and the limiting component is connected to the push plate and also has a certain rotation range. The shaft hole of the present application is set as a strip hole, which can prevent the limiting component from getting stuck.

[0020] In one possible design, the push plate is further provided with a mounting groove, the mounting groove including a first groove wall and a second groove wall that are opposite to each other, the mounting shaft being fixed to the first groove wall. The limiting component further includes a limiting arm connected to the first connecting end and abutting against the second groove wall.

[0021] The circuit breaker provided by this embodiment provides a mounting groove on the push plate and a limiting arm on the limiting component. The limiting arm reduces the shaking of the limiting component in the front-to-back direction, thereby helping to accurately position the second connection end of the limiting component.

[0022] In a possible design, the limiting arm is a plate-like structure with curvature, which gives the limiting arm a certain degree of elasticity, which not only helps to limit the limiting component but also prevents the limiting component from getting stuck.

[0023] In one possible design, a curved flange is provided at the location opposite the second groove wall and the stop arm. The surface of the stop arm that contacts the flange is a flat surface. This creates linear contact between the stop arm and the flange, helping to prevent the stop member from becoming stuck.

[0024] In one possible design, a slot is provided on one side of the mounting plate where the operating handle is mounted, with a stopper hole communicating with the slot. The protrusion is positioned within the slot. This creates a more compact fit between the operating handle and the mounting plate, helping to reduce the size of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a front view of a circuit breaker provided in an embodiment of the present application in an open state.

[0026] Figure 2 Shown is a side view of a circuit breaker provided in an embodiment of the present application in an open state.

[0027] Figure 3 Shown is a side view of a circuit breaker provided in an embodiment of the present application in a closed state.

[0028] Figure 4 for Figure 2 Top view of .

[0029] Figure 5 for Figure 3 Top view of .

[0030] Figure 6 This is a schematic diagram of the status indicator of the circuit breaker provided in an embodiment of the present application when it trips and opens due to an internal fault.

[0031] Figure 7 for Figure 4 AA cross-section diagram.

[0032] Figure 8 A schematic diagram of the three-dimensional structure of an operating handle provided in an embodiment of the present application.

[0033] Figure 9 A top view of a mounting plate provided in an embodiment of the present application.

[0034] Figure 10 A structural diagram of a limiting component provided in an embodiment of the present application.

[0035] Figure 11 for Figure 5 AA cross-section diagram.

[0036] Figure 12 for Figure 9 AA cross-section diagram.

[0037] Figure 13 This is a structural diagram of a push plate provided in an embodiment of the present application.

[0038] The accompanying drawings are denoted as follows:

[0039] 11. Operating handle; 111. Status indicator; 112. Bump;

[0040] 12. Transmission components;

[0041] 13. Push plate; 131. Mounting shaft; 132. Mounting groove; 1321. Flange;

[0042] 21. Mounting plate; 211. Limiting hole; 2111. Guide wall; 21A. Normal closing position; 21B. Normal opening position; 212. Slideway;

[0043] 31. Moving contact support; 32. Moving contact; 33. Contact spring;

[0044] 41. Static contact;

[0045] 51. Limiting component; 511. First connecting end; 5111. Axial hole; 512. Second connecting end; 513. Limiting arm. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification, claims, and figures of this application are intended to cover non-exclusive inclusions.

[0048] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] The directional words appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the current limiting module of this application. For example, in the description of this application, the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting this application.

[0050] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier, such as a fixed connection through screws, bolts or other barrier. The physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit connection. The physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] Figure 1 FIG. 1 is a front view of a circuit breaker in an open state provided by an embodiment of the present application. Figure 2 FIG. 1 is a side view of a circuit breaker in an open state provided by an embodiment of the present application. Figure 3 Shown is a side view of a circuit breaker provided in an embodiment of the present application in a closed state.

[0053] It should be noted that Figure 1 、 Figure 2 and Figure 3 This is not a complete schematic diagram of the circuit breaker, but only a partial schematic diagram of the structure related to the invention of this application. In order to more clearly illustrate the internal structure of the circuit breaker, only part of the housing of the circuit breaker is illustrated. Based on the same consideration, the following mentioned Figures 4 to 7 、 Figure 9 The circuit breaker structure diagram shown is not a complete structure diagram.

[0054] Please refer to Figure 1 Figure 2 and Figure 3 The circuit breaker provided in the present application includes a housing, an operating mechanism and a contact assembly. The operating mechanism includes an operating handle 11, a transmission assembly 12 and a push plate 13. The operating handle 11 is located outside the housing. The housing includes a mounting plate 21. The operating handle 11 is mounted on the mounting plate 21 and can rotate relative to the mounting plate 21. The transmission assembly 12, the push plate 13 and the contact assembly are located inside the housing. The transmission assembly 12 is configured to control the contact and separation of the moving contact 32 and the static contact 41 in the contact assembly by driving the push plate 13 to rotate under the drive of the operating handle 11. The circuit breaker also includes a limiting component 51. The limiting component 51 is configured to be driven by the push plate 13 and does not affect the rotation of the operating handle 11 during normal closing and normal opening. When the contact assembly fails and the moving contact 32 and the static contact 41 cannot be separated, the operating handle 11 is affected by the limiting component 51 and cannot return to the normal opening state.

[0055] The following is a detailed description of this application.

[0056] Please continue to refer to Figures 1 to 3 In the present application, the operating handle 11 is located outside the housing. The operating handle 11 includes a status indicator 111. The status indicator 111 points to different directions when the circuit breaker is normally closed, normally opened, or tripped and opened due to an internal fault, thereby distinguishing the three states.

[0057] Please refer to Figure 4 and Figure 6 , Figure 4 for Figure 2 A top view of Figure 4 A schematic diagram showing the status of a status indicator of a circuit breaker provided by an embodiment of the present application when normally opened is shown. Figure 5 for Figure 3 A top view of Figure 5 A schematic diagram showing the status of a status indicator of a circuit breaker provided by an embodiment of the present application when normally closed. Figure 6 This is a schematic diagram of the status indicator of the circuit breaker provided in an embodiment of the present application when it trips and opens due to an internal fault.

[0058] It is understandable that Figures 1 to 6 The operating handle 11 presented is only one embodiment of the present application. Figures 1 to 6 In the embodiment, the status indicator 111 presents a strip structure. In other embodiments of the present application, the status indicator 111 may also be in other shapes, such as a curve. It can also be understood that Figures 4 to 6 The three indication directions of the middle status indicator are merely illustrative of the three different states of the circuit breaker. In other embodiments of the present application, the three states may be distinguished by other directions.

[0059] Please continue to refer to Figure 1 In this application, the transmission assembly 12 is not a single component, but generally includes multiple transmission components, such as a balance wheel, connecting rods, jump buckles, and a top plate. The transmission chain of the transmission assembly 12 is relatively long. It is understood that the transmission assembly 12 can have various forms based on differences in usage environments and transmission principles, and this application does not limit this.

[0060] Please continue to refer to Figure 1 In the present application, the push plate 13 is located between the transmission assembly 12 and the contact assembly. The push plate 13 can rotate in a first direction or a second direction under the drive of the transmission assembly 12. The second direction is the opposite direction of the first direction.

[0061] It is understandable that Figure 1 The push plate 13 shown in the figure is only a specific form of the push plate 13. In other embodiments of the present application, the push plate 13 may also adopt other shapes according to the specific use environment.

[0062] Please combine Figure 2 and Figure 3 In this application, the contact assembly includes a moving contact and a stationary contact. The moving contact comprises a moving contact support 31, a moving contact point 32, and a contact spring 33. The moving contact support 31 is located in the rotation path of the push plate 13, and the moving contact point 32 is fixed to the moving contact support 31. The contact spring 33 is located on the side of the moving contact support 31 away from the push plate 13. The stationary contact includes a fixed stationary contact point 41, which is arranged opposite the moving contact point 32. The main function of the contact spring 33 is to ensure reliable and stable contact between the moving contact point 32 and the stationary contact 41.

[0063] Please combine Figure 1 、 Figure 2 and Figure 3 The basic working principle of the circuit breaker provided in this application is:

[0064] During normal closing, the operating handle 11 rotates in a first direction. The driving force generated by the operating handle 11 is transmitted through multiple components of the transmission assembly 12 and ultimately applied to the push plate 13, causing it to rotate away from the contact assembly. This releases the restraint on the movable contact 32 in the contact assembly, causing it to move toward the stationary contact 41, closing the circuit breaker. The status indicator 111 of the operating handle 11 remains in the closed position.

[0065] During normal opening, the operating handle 11 rotates in the second direction. The driving force generated by the operating handle 11 is transmitted through multiple components of the transmission assembly 12 and ultimately applied to the push plate 13, causing it to rotate toward the contact assembly, squeezing the movable contact, moving the movable contact 32 away from the static contact 41, and opening the circuit breaker. The status indicator 111 of the operating handle 11 remains in the opening indication position.

[0066] When the circuit breaker trips due to an internal fault, the operating handle 11 is generally driven by the internal transmission assembly 12 to rotate in the second direction. Simultaneously, the transmission assembly 12 drives the push plate 13 to rotate toward the contact assembly, squeezing the movable contact 32 away from the stationary contact 41, thereby opening the circuit breaker. The status indicator 111 of the operating handle 11 remains in the fault indication position.

[0067] However, when the moving contact 32 and the static contact 41 of the circuit breaker are welded and cannot be separated, the rotation of the push plate 13 is also restricted. Therefore, under natural circumstances, the status indicator 111 of the operating handle 11 remains in the closing indication position and cannot display the fault status.

[0068] In related art, when a circuit breaker's moving contact 32 and stationary contact 41 become welded and unable to separate, and the operator is unaware of the circuit breaker malfunction, they may use considerable force to manually open the circuit breaker. Due to the long transmission chain of the transmission assembly 12, the accumulation of component manufacturing errors, and component deformation, the operator may rotate the operating handle 11 to the opening position. However, at this point, the moving contact 32 and stationary contact 41 remain welded inside the circuit breaker, creating a potential safety risk.

[0069] In the present application, the circuit breaker also includes a limiting component 51. The limiting component 51 is configured to be driven by the push plate 13, and does not affect the rotation of the operating handle 11 during normal closing and normal opening. When the contact assembly fails and the moving contact 32 and the static contact 41 cannot be separated, the operating handle 11 is affected by the limiting component 51 and cannot return to the normal opening state. In this way, even if the moving contact 32 and the static contact 41 of the circuit breaker are welded and cannot be separated, in the absence of external force intervention, the status indicator 111 of the circuit breaker displays the normal closing state. In the case of external force intervention, since the operating handle 11 cannot return to the normal opening state, the operator cannot simply assume that the circuit breaker is a normally opened circuit breaker. Therefore, it can avoid the operator from mistaking the faulty circuit breaker for a normal circuit breaker and reducing the occurrence of potential safety risks.

[0070] Figure 7 for Figure 4 AA cross-section diagram, Figure 7 The diagram shows the coordination relationship among the mounting plate 21 , the operating handle 11 and the limiting component 51 when the circuit breaker is in the open state. Figure 8 This is a schematic diagram of the three-dimensional structure of an operating handle provided in an embodiment of the present application. Figure 8 In one embodiment of the present application, a protrusion 112 is further provided on the side of the operating handle 11 close to the mounting plate 21 .

[0071] Figure 9 This is a top view of a mounting plate provided in an embodiment of the present application. Please refer to Figure 7 and Figure 9 In one embodiment of the present application, the mounting plate 21 is further provided with a limiting hole 211 , which passes through the mounting plate 21 and is connected to the rotation area of the protrusion 112 .

[0072] Figure 10 For a structural diagram of a limiting component provided in an embodiment of the present application, please refer to Figure 10 In one embodiment of the present application, the limiting component 51 includes a first connecting end 511 and a second connecting end 512 relative to each other, the first connecting end 511 is connected to the push plate 13, and the second connecting end 512 is located at the limiting hole 211.

[0073] Please continue to refer to Figure 7 In the normal opening state, the second connection end 512 does not extend out of the limiting hole 211.

[0074] Figure 11 for Figure 5 AA cross-section diagram, Figure 11 The diagram shows the coordination relationship between the mounting plate 21, the operating handle 11 and the limiting component 51 when the circuit breaker is in the closed state. Figure 7 、 Figure 8 、 Figure 9 and Figure 11 When the switch is closed normally, the operating handle 11 drives the protrusion 112 to rotate in the first direction. When the protrusion 112 rotates past the position of the limiting hole 211, the second connection end 512 can extend out of the limiting hole 211 under the drive of the push plate 13 and enter the rotation area of the protrusion 112. The operating handle 11 continues to rotate to the normal closing state.

[0075] Please combine Figure 7 、 Figure 8 、 Figure 9 and Figure 11 When the switch is normally opened, the operating handle 11 drives the protrusion 112 to rotate along the second direction. When the protrusion 112 is rotated to the position of the limiting hole 211, the second connection end 512 has retreated into the limiting hole 211 under the drive of the push plate 13, and the operating handle 11 can be rotated to the normal opening state.

[0076] Please combine Figure 7 、 Figure 8 、 Figure 9 and Figure 11 When the contact assembly fails and the moving contact 32 and the static contact 41 cannot be separated, the rotation of the push plate 13 is restricted, and the second connecting end 512 cannot retreat into the limiting hole 211, thereby blocking the rotation of the protrusion 112, thereby preventing the operating handle 11 from rotating to the normal opening state.

[0077] Please combine Figure 1 、 Figure 2 and Figure 3 The basic principle of the limiting component 51 in this embodiment is as follows: During normal closing, the push plate 13 is driven by the operating handle 11 and rotates upward (away from the contact assembly). Because the first connection end 511 of the limiting component 51 is connected to the push plate 13, the limiting component 51 has an upward displacement as the push plate 13 rotates. In the initial stage of rotation of the operating handle 11, although the limiting component 51 has an upward displacement, it is not sufficient to allow the second connection end 512 to fully extend out of the limiting hole 211. In this way, the operating handle 11 can drive the protrusion 112 to pass the position of the limiting hole 211 without being blocked by the second connection end 512, and the circuit breaker closes normally. As the operating handle 11 continues to rotate, the limiting component 51 has sufficient displacement, and the second connection end 512 will extend out of the limiting hole 211.

[0078] During normal opening, the push plate 13 is driven by the operating handle 11 and rotates downward (toward the contact assembly). Since the first connection end 511 of the limiting component 51 is connected to the push plate 13, the limiting component 51 has a downward displacement as the push plate 13 rotates. In this way, during the opening process, the second connection end 512 of the limiting component 51 can be retracted into the limiting hole 211.

[0079] When the circuit breaker moving contact 32 and the static contact 41 cannot be separated, the second connection end 512 cannot return to the limiting hole 211 due to the restricted rotation of the push plate 13, thereby preventing the operating handle 11 from rotating to the normal opening state.

[0080] In summary, in one embodiment of the present application, by providing a protrusion 112 on the operating handle 11, providing a matching limiting hole 211 on the mounting plate 21, and providing a limiting component 51 with the help of the push plate 13, and utilizing the characteristics of the push plate 13 during opening and closing, the protrusion 112, the limiting hole 211, the push plate 13, and the limiting component 51 can effectively cooperate with each other. Therefore, when the moving contact 32 and the static contact 41 of the circuit breaker are welded, the external force that rotates the operating handle 11 to the normal state can be blocked, and the operator is reminded that the circuit breaker is in an abnormal open state, thereby preventing the operator from mistaking a faulty circuit breaker for a normal circuit breaker, reducing the occurrence of potential safety risks. The normal closing and opening of the circuit breaker are not affected.

[0081] Please combine Figures 7 to 9 In some embodiments of the present application, the mounting plate 21 includes a normally closed position 21A and a normally open position 21B, and the limiting hole 211 is located between the normally closed position 21A and the normally open position 21B, and is close to the normally open position 21B. Alternatively, the limiting hole 211 is located in the normally open position 21B. In the normally open state, the protrusion 112 is close to the limiting hole 211, and the protrusion 112 is located on the side of the limiting hole 211 away from the closed position.

[0082] Please continue to refer to Figure 9 , Figure 9 One dotted box represents the normal closing position 21A, and the other dotted box represents the normal opening position 21B. Positioning the limiting hole 211 between the normal closing position 21A and the normal opening position 21B, and close to the normal opening position 21B, is advantageous. Alternatively, positioning the limiting hole 211 at the normal opening position 21B allows the protrusion 112 to more easily pass over the limiting hole 211 before the second connection end 512 extends out of the limiting hole 211 during normal closing, thereby preventing normal closing. During normal opening, the second connection end 512 also has ample time to return to the limiting hole 211, thereby preventing normal opening.

[0083] Figure 12 for Figure 9 For the AA cross-section diagram, please refer to Figure 12 In some embodiments of the present application, a guide wall 2111 is further provided at one end of the limiting hole 211 away from the operating handle 11 .

[0084] Please combine Figure 7 and Figure 12 As before, the limiting component 51 moves upward or downward as the push plate 13 rotates. At the same time, the limiting component 51 also rotates slightly. The present application further provides a guide wall 2111 at the end of the limiting hole 211 away from the operating handle 11. In this way, the second connecting end 512 can be prevented from being obstructed during movement, making it easier for the second connecting end 512 to extend out of or retract into the limiting hole 211 under the drive of the push plate 13.

[0085] Figure 13 For a structural diagram of a push plate provided in an embodiment of the present application, please refer to Figure 13 In one embodiment of the present application, a mounting shaft 131 is fixed to the push plate 13. The first connecting end 511 has a shaft hole 5111 adapted to the mounting shaft 131.

[0086] Please combine Figure 2 and Figure 13 or Figure 3 and Figure 13 In one embodiment of the present application, a mounting shaft 131 is provided on the push plate 13, and an axial hole 5111 adapted to the mounting shaft 131 is provided at the first connection end 511. In this way, the limiting component 51 can be movably connected to the push plate 13, and extend or retract into the limiting hole 211 as the push plate 13 rotates.

[0087] It should be noted that, in some other embodiments of the present application, the mounting shaft 131 may also be provided on the limiting component 51 , and the shaft hole 5111 may be provided on the push plate 13 .

[0088] Please continue to refer to Figure 10 In some embodiments of the present application, the shaft hole 5111 is a bar-shaped hole. The mounting shaft 131 is cylindrical, and the width of the shaft hole 5111 matches the diameter of the mounting shaft 131.

[0089] Please combine Figure 2 、 Figure 10 and Figure 13 In the present application, the width of the shaft hole 5111 is controlled so that the width of the shaft hole 5111 is adapted to the diameter of the mounting shaft 131. In this way, the limiting component 51 can rotate around the mounting shaft 131, and the shaking of the limiting component 51 in the up and down directions is reduced, so that the displacement of the limiting component 51 can be controlled more accurately, so that the second connection end 512 of the limiting component 51 can be accurately extended or retracted into the limiting hole 211.

[0090] In addition, as mentioned above, the movement mode of the push plate 13 is rotation, the limiting component 51 is connected to the push plate 13, and the limiting component 51 also has a certain rotation range. The shaft hole 5111 of the present application is set as a strip hole, which can prevent the limiting component 51 from getting stuck.

[0091] Please continue to refer to Figure 13 In some embodiments of the present application, the push plate 13 is further provided with a mounting groove 132. The mounting groove 132 includes a first groove wall and a second groove wall that are opposite to each other. The mounting shaft 131 is fixed to the first groove wall. The limiting component 51 also includes a limiting arm 513. The limiting arm 513 is connected to the first connecting end 511 and abuts against the second groove wall.

[0092] Please combine Figure 2 、 Figure 10 and Figure 13 In some embodiments of the present application, a mounting groove 132 is provided, and a limiting arm 513 is provided on the limiting component 51. The limiting arm 513 reduces the shaking of the limiting component 51 in the front and rear directions, thereby helping to accurately position the second connection end 512 of the limiting component 51.

[0093] Please continue to refer to Figure 10 In some embodiments of the present application, the limiting arm 513 is a plate-like structure with curvature. This gives the limiting arm 513 a certain degree of elasticity, which not only helps to limit the limiting component 51 but also prevents the limiting component 51 from getting stuck.

[0094] Please continue to refer to Figure 13 In some embodiments of the present application, a curved flange 1321 is further provided at the portion of the second groove wall opposite the limiting arm 513. The surface of the limiting arm 513 that contacts the flange 1321 is a flat surface. This creates linear contact between the limiting arm 513 and the flange 1321, helping to prevent the limiting component 51 from becoming stuck.

[0095] Please continue to refer to Figure 9 In some embodiments of the present application, a slot 212 is provided on one side of the mounting plate 21 for mounting the operating handle 11. The limiting hole 211 communicates with the slot 212. The protrusion 112 is located within the slot 212. This makes the operating handle 11 and the mounting plate 21 more compact, helping to reduce the size of the circuit breaker.

[0096] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0097] As described above, the above embodiments are intended only to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. However, such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A circuit breaker, characterized in that: It includes a housing, an operating mechanism and a contact assembly, wherein the operating mechanism includes an operating handle, a transmission assembly and a push plate; The operating handle is located outside the housing, and the housing includes a mounting plate. The operating handle is mounted on the mounting plate and can rotate relative to the mounting plate. The transmission assembly, push plate and contact assembly are located in the housing; the transmission assembly is configured to control the contact and separation of the moving contact and the static contact in the contact assembly by driving the push plate to rotate under the drive of the operating handle; The circuit breaker further includes a limiting component, which is configured to be driven by the push plate and does not affect the rotation of the operating handle during normal closing and normal opening. When the contact assembly fails and the moving contact and the static contact cannot be separated, the operating handle is affected by the limiting component and cannot return to the normal opening state.

2. The circuit breaker according to claim 1, wherein: A protrusion is further provided on one side of the operating handle close to the mounting plate; The mounting plate is further provided with a limiting hole, which passes through the mounting plate and is connected to the rotation area of the protrusion; The limiting component includes a first connecting end and a second connecting end opposite to each other, the first connecting end is connected to the push plate, and the second connecting end is located at the limiting hole; In a normal open state, the second connection end does not extend out of the limiting hole; During normal closing, the operating handle drives the protrusion to rotate in the first direction. When the protrusion passes the position of the limiting hole, the second connecting end can extend out of the limiting hole under the drive of the push plate and enter the rotation area of the protrusion. During normal opening, the operating handle drives the protrusion to rotate in the second direction. When the protrusion rotates to the position where the limiting hole is located, the second connection end has retreated into the limiting hole under the drive of the push plate, and the operating handle can be rotated to the normal opening state. When the contact assembly fails and the moving contact and the static contact cannot be separated, the rotation of the push plate is restricted, and the second connecting end cannot be retracted into the limiting hole, thereby blocking the rotation of the protrusion and preventing the operating handle from rotating to the normal opening state; The second direction is the opposite direction of the first direction.

3. The circuit breaker according to claim 2, wherein: The mounting plate includes a normal closing position and a normal opening position, and the limiting hole is located between the normal closing position and the normal opening position and close to the normal opening position; or, the limiting hole is located at the normal opening position; In a normal opening state, the protrusion is close to the limiting hole, and the protrusion is located on a side of the limiting hole away from the closing position.

4. The circuit breaker according to claim 2, wherein: A guide wall is further provided at one end of the limiting hole away from the operating handle.

5. The circuit breaker according to any one of claims 2 to 4, characterized in that: A mounting shaft is fixed on the push plate; and the first connecting end has a shaft hole adapted to the mounting shaft.

6. The circuit breaker according to claim 5, characterized in that The shaft hole is a strip-shaped hole; the installation shaft is cylindrical, and the width of the shaft hole is adapted to the diameter of the installation shaft.

7. The circuit breaker according to claim 5, characterized in that The push plate is further provided with a mounting groove, the mounting groove comprising a first groove wall and a second groove wall opposite to each other, the mounting shaft being fixed to the first groove wall; The limiting component further includes a limiting arm, which is connected to the first connecting end and abuts against the second groove wall.

8. The circuit breaker according to claim 7, characterized in that The limiting arm is a plate-shaped structure with curvature.

9. The circuit breaker according to claim 8, characterized in that A flange with an arc-shaped surface is further provided at a position where the second groove wall is opposite to the limiting arm; and the surface of the limiting arm used for contacting the flange is a plane.

10. The circuit breaker according to any one of claims 2 to 4, characterized in that: A sliding groove is provided on one side of the mounting plate for mounting the operating handle, and the limiting hole is communicated with the sliding groove; the protrusion is located in the sliding groove.

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