Circuit breaker leakage protection indicating device

Abstract

The invention provides a circuit breaker leakage protection indicating device, which comprises a shell, a first locking structure and a second locking structure, and is characterized in that the first locking structure comprises a first lock catch and a jump pin which are rotationally arranged and keep locking fit through an elastic structure; the second locking structure comprises a second lock catch, an indicating piece and an elastic reset piece. The indicating piece is driven by the operating mechanism to be away from the window and is locked with the second lock catch. When the electric leakage tripping structure is triggered, the first lock catch and the jump pin are driven to be unlocked, then the second lock catch unlocks the indicating piece through the jump pin, the indicating piece is automatically reset under the action of the elastic reset piece and is displayed on the window, and the jump pin synchronously drives the operating mechanism to be tripped. According to the electric leakage protection indicating device, double insurance is formed through a two-stage locking and tripping linkage mechanism, the two-stage locking is mutually restricted and triggered layer by layer, it is ensured that an indicating action strictly corresponds to an electric leakage fault, and the technical purposes of accurate indication of the electric leakage fault, automatic and error-free action, stable structure and interference resistance are achieved.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, and more specifically to a circuit breaker leakage current including an indicator device. Background Technology

[0002] As an important electrical protection device, residual current circuit breakers (RCCBs) are widely used in industrial, commercial, and residential power distribution systems to promptly cut off power in the event of leakage, overload, or short circuit faults, ensuring the safety of personnel and equipment. With the continuous improvement of electrical safety standards, users have placed higher demands on the functionality and reliability of circuit breakers. In particular, the ability to quickly and accurately determine the cause of tripping after a circuit breaker has become a key factor affecting user experience and safe maintenance.

[0003] Most circuit breakers, after tripping, can only indicate to the user by changing the position of the operating handle, but cannot distinguish the specific cause of the trip—that is, it cannot be determined whether the trip was caused by leakage, overload, or short circuit. To improve this problem, some circuit breakers have begun to incorporate leakage current indication mechanisms. For example, a leakage current indication mechanism for a leakage current circuit breaker disclosed in Chinese patent document CN219163297U uses a leakage current indication button movably installed in the indication hole of the housing, a return spring, and a tripping rod linked to an electromagnetic trip unit. The mechanical indication of the leakage current status is achieved by locking and releasing the indication button through the tripping rod. Although the solution provides visual indication of leakage status and has a certain tripping and locking function, its button-type pop-up indicator structure still has the following problems in practical application and long-term reliability: the indicator button relies on a reset spring to pop up, and the user needs to manually press the indicator button to reset it after troubleshooting. If the button and the tripping rod are not aligned during the reset process, it may lead to locking failure, or even closing the circuit breaker before it is fully reset, which poses a risk of misoperation. Therefore, it is necessary to optimize the layout of the existing leakage current indicator mechanism and provide a leakage current indicator mechanism that is more accurate and reliable, easy to reset, has a stable tripping and locking function, and is suitable for long-term use, so as to comprehensively improve the safety performance of leakage current circuit breakers and the user's operating experience. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem that existing leakage current indication mechanisms require manual pressing of the indicator button to reset after troubleshooting, and that misalignment between the button and the trip lever during the reset process may lead to locking failure and the risk of misoperation. Therefore, this invention provides a circuit breaker leakage current indication device that is more accurate and reliable, easy to reset, and has a stable trip locking function.

[0005] To solve the above problems, the present invention provides a circuit breaker leakage current protection indicating device, comprising: The casing has a viewing window; The first locking structure includes a first latch and a jumper rotatably disposed on the housing. The first latch and the jumper approach each other and rotate through an elastic structure, so that the first latch and the jumper are connected to form a locking engagement that keeps their relative positions locked. The second locking structure includes a second latch and an indicator rotatably disposed on the housing, and an elastic reset member connecting the second latch and the indicator. The elastic reset member keeps the second latch and the indicator in close proximity. The indicator is driven by the circuit breaker operating mechanism to move away from the viewing window and form a locking engagement with the second latch. The second latch is disposed on the movement path of the trip latch and is driven by the trip latch to release the locking engagement with the indicator. A leakage current tripping structure is installed in the housing to drive the first latch to operate. When a leakage current fault occurs in the circuit breaker, the leakage current tripping structure drives the first latch and the tripping latch to first unlock, and then drives the second latch to unlock the indicator through the tripping latch, so that the indicator is reset to the visible window position under the action of the elastic reset member, and the unlocked tripping latch drives the operating mechanism to perform the tripping action.

[0006] In the aforementioned circuit breaker leakage protection indicator device, the first latch is provided with a first stop surface at the end near the trip latch, and the trip latch is provided with a first stop surface that abuts against the first stop surface to form a locking engagement.

[0007] The aforementioned circuit breaker leakage protection indicator device includes a first elastic element disposed on the housing and connected to the first latch, and a second elastic element disposed on the housing and connected to the trip latch. The first latch tends to rotate towards the trip latch under the action of the first elastic element, and the trip latch tends to rotate towards the first latch under the action of the second elastic element, and forms a limiting engagement with a rotating wheel disposed on the housing. The rotating wheel is provided with a limiting block that partially overlaps with the movement trajectory of the trip latch.

[0008] In the aforementioned circuit breaker leakage protection indicator device, the first elastic element is a locking torsion spring sleeved on the rotating shaft of the first latch. One end of the locking torsion spring is connected to the limiting groove formed by the first latch, and the other end extends and abuts against the housing. The first elastic element causes the first latch to tend to maintain a locked engagement with the latch.

[0009] The aforementioned circuit breaker leakage protection indicator device includes a tripping clip comprising a circular shaft portion having a shaft hole, and a first tripping clip arm, a second tripping clip arm, a third tripping clip arm, and a fourth tripping arm spaced around the shaft hole on the side wall of the circular shaft portion. The second elastic element is a tension spring structure with one end fixed to the housing and the other end extending and connected to the third tripping clip arm. The tripping clip forms a limiting engagement with the limiting block of the rotating wheel through the first tripping clip arm. A first stop surface is formed at the root position where the first tripping clip arm connects to the circular shaft portion.

[0010] The aforementioned circuit breaker leakage protection indicator device has an indicator element and a trip latch rotatably mounted on the housing. The second latch is rotatably mounted on the upper side of the trip latch. The elastic reset element is a reset torsion spring with its two ends respectively abutting against the second latch and the indicator element. The indicator element includes an indicator surface at its top and a pressure-receiving boss at the bottom side of the indicator surface, as well as a second stop surface on one side of the pressure-receiving boss. The second latch includes a first linkage rod that extends to contact the pressure-receiving boss under the action of the elastic reset element, and a second stop surface mounted on the first linkage rod and forming a locking engagement with the second stop surface. The side wall of the indicator element is provided with a first latch for positioning and connecting one end of the reset torsion spring, and the first linkage rod is provided with a second latch for positioning and connecting the other end of the reset torsion spring.

[0011] The aforementioned circuit breaker leakage protection indicator device includes an operating mechanism for driving an indicator to move away from the viewing window. The mechanism latch has a driving part protruding to one side of the indicator. The indicator has a driven part that abuts against the driving part in a misaligned engagement. The driven part and the pressure-bearing protrusion are arranged opposite each other vertically and form a movable groove between them through which a first linkage rod can pass. The second latch includes a locking protrusion on the first linkage rod. The locking protrusion has a transition surface that contacts the bottom surface of the pressure-bearing protrusion and a second stop surface and a guide slope connected on both sides of the transition surface. When the driven part pushes the driven part, the indicator rotates relative to the second latch so that the second stop surface moves out of the bottom of the pressure-bearing protrusion and abuts against the second stop surface.

[0012] The aforementioned circuit breaker leakage protection indicator device includes a trip latch with a drive slot formed between a first trip latch arm and a second trip latch arm. The second latch has a second linkage rod movably disposed in the drive slot. When the trip latch is unlocked and rotated, it drives the second linkage rod to rotate the second latch, thereby causing the second stop surface to disengage from the second stop surface to release the locking engagement between the second latch and the indicator.

[0013] The aforementioned circuit breaker leakage protection indicator device has a trip hole on its housing, and the operating mechanism includes a trip shaft disposed in the trip hole. The fourth trip arm of the trip lever extends to the trip hole and is provided with a trip boss that cooperates with the trip shaft. During the unlocking and rotation process, the trip lever drives the trip shaft through the fourth trip arm to trigger the operating mechanism to perform a tripping action.

[0014] In the aforementioned circuit breaker leakage protection indicator device, the first latch is rotatably located in the area between the first and third trip arms of the trip latch and is disposed opposite to the leakage trip structure. The leakage trip structure includes a leakage trip unit disposed in the housing, a push plate rotatably connected between the leakage trip unit and the first latch, and a push plate torsion spring connected between the push plate and the mechanism latch. The top rod of the leakage trip unit is connected to the push plate, and the other end of the first latch is provided with a latch rod located on the rotation path of the push plate.

[0015] The aforementioned circuit breaker leakage protection indicator includes a housing comprising a base and a circuit breaker housing fitted and connected to the base. The first locking structure and the second locking structure are disposed in the base. The operating mechanism and its mechanism latch are disposed in the circuit breaker housing. The driving part of the mechanism latch passes through the base and cooperates with the indicator.

[0016] The technical solution of this invention has the following advantages compared with the prior art: 1. The circuit breaker leakage protection indicator device provided by this invention achieves a dedicated indication of leakage faults through the linkage design between the leakage trip structure, the first locking structure, and the second locking structure. When the circuit breaker is working normally, the indicator is driven away from the viewing window by the operating mechanism and locks with the second latch. When a leakage fault occurs, the leakage trip structure will drive the first latch and the trip latch to unlock, and then trigger the second latch to unlock through the trip latch. The indicator can be automatically reset to the position of the viewing window under the elastic force of the elastic reset member without manual intervention. This eliminates the need for manual reset steps and avoids locking failure caused by misalignment. Users can directly determine the cause of the trip through the viewing window without additional troubleshooting, greatly improving maintenance efficiency. The leakage current protection indicator device adopting this technical solution forms a double insurance through a two-level locking and tripping linkage mechanism. The first-level locking is maintained by an elastic structure to maintain the locking cooperation between the first latch and the trip latch. Only the leakage current tripping structure can trigger the unlocking, avoiding false locking in non-leakage scenarios. The second-level locking is an indication lock between the second latch and the indicator. Only the unlocked trip latch can trigger the second latch to unlock the indicator, avoiding false reset of the indicator due to accidental loosening of the second latch. These two levels of locking restrict each other and trigger layer by layer to ensure that the indication action strictly corresponds to the leakage current fault. Ultimately, it achieves the technical goals of accurate indication of leakage current fault, automatic and error-free action, and stable and anti-interference structure, significantly improving the safety performance and user experience of the leakage current circuit breaker.

[0017] 2. In the circuit breaker leakage protection indicator device provided by the present invention, the first latch and the trip latch form a reliable mechanical lock through the contact cooperation of the first stop surface and the first stop surface. With the help of the elastic force provided by the first elastic element and the second elastic element, the first latch and the trip latch rotate closer to each other, thereby maintaining the locking trend and avoiding accidental unlocking due to vibration or small displacement. The locking stability is stronger. The rotating wheel partially overlaps with the movement trajectory of the trip latch through the limit block, thereby limiting and constraining the trip latch. Since the rotating wheel is linked with the handle, when the circuit breaker resolves the leakage fault and is reclosed, the rotating wheel rotates with the handle, and pushes the trip latch to reset and rotate through the limit block, so that the trip latch returns to the locked position with the first latch, ensuring the accuracy of the trip latch reset action and preparing for the next leakage trip action.

[0018] 3. In the circuit breaker leakage protection indicator device provided by the present invention, when the circuit breaker performs a normal closing operation, the mechanism latch of the operating mechanism pushes the driven part of the indicator through the driving part, forcing the indicator to overcome the force of the reset torsion spring and rotate away from the viewing window. During this rotation, the pressure boss on the indicator slides along the locking protrusion of the second latch and presses down, forcing the second latch to produce a slight reverse rotation. When the indicator rotates to the designated position, the second stop surface slides over the locking protrusion and finally abuts against the second stop surface on the second latch. The elastic force of the reset torsion spring keeps the second stop surface and the second stop surface locked, strengthening the stability of the lock. Thus, the indicator and the second latch maintain a locked engagement. At this time, the indicator is reliably locked in a non-display position away from the viewing window.

[0019] 4. In the circuit breaker leakage protection indicator device provided by the present invention, the trip lever is driven by the fourth trip lever arm directly driving the trip shaft of the mechanism lock. This fourth trip lever arm is a lever arm extending from the rotating shaft of the trip lever. The end of its movement trajectory can be planned to the position of the trip hole on the housing, which is conducive to realizing the miniaturization and compact design of the leakage module. By reasonably designing the length of the fourth trip lever arm and the position of the trip boss, the force and stroke on the trip shaft can be optimized. According to the fact that the trip lever has a large rotational kinetic energy when it trips, this kinetic energy can be converted into a sufficient impact force and accurate movement stroke on the trip shaft through the lever principle, ensuring that the operating mechanism lock can be reliably released, overcoming the resistance of the mechanism spring, and completing the mechanism tripping action.

[0020] 5. In the circuit breaker leakage protection indicator device provided by the present invention, the trip latch is rotated and positioned between the indicator and the mechanism latch. The first latch is arranged between the first and third trip latch arms of the trip latch and connected to the leakage trip unit through a push plate. With this structural layout, the first latch makes full use of the idle space around the trip latch. This allows the first locking structure, the second locking structure, and the leakage trip structure to be highly integrated around the rotation axis of the trip latch, greatly reducing the area occupied by the entire leakage module. The space layout is compact and conducive to the miniaturization design of the circuit breaker. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0022] Figure 1 This is a schematic diagram of the circuit breaker leakage protection indicator device of the present invention in the closed-lock state; Figure 2 This is a schematic diagram of the circuit breaker leakage protection indicator device of the present invention in the leakage trip state; Figure 3 for Figure 1 The diagram shows the structure of the leakage current protection indicator in the locked state. Figure 4 for Figure 3 A schematic diagram of the structure of the leakage current protection indicator device on the other side; Figure 5 This is a schematic diagram of the connection structure between the indicator and the mechanism latch of the present invention; Figure 6 for Figure 2 The diagram shows the structure of the leakage current protection indicator in the locked state. Figure 7 for Figure 6 A schematic diagram of the structure of the leakage current protection indicator device on the other side; Figure 8 This is a schematic diagram of the mounting structure of the mechanism latch of the present invention; Figure 9 This is a three-dimensional structural schematic diagram of the circuit breaker leakage protection indicator device of the present invention; Figure 10 This is a schematic diagram of the structure of the first latch of the present invention; Figure 11 This is a schematic diagram of the jump buckle structure of the present invention; Figure 12 This is a schematic diagram of the structure of the second latch of the present invention; Figure 13 This is a schematic diagram of the second latch of the present invention from another direction; Figure 14This is a schematic diagram of the structure of the indicator of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Housing; 10. Tripping hole; 11. Viewing window; 12. Handle; 13. Leakage housing; 14. Circuit breaker housing; 2. First latch; 21. First stop surface; 22. Latch rod; 3. Tripping latch; 31. First tripping latch arm; 32. Second tripping latch arm; 33. Third tripping latch arm; 34. Fourth tripping arm; 35. First stop surface; 36. Drive slot; 37. Tripping boss; 4. Second latch; 41. First linkage rod; 42. Second linkage rod; 43. 44. Second stop surface; 45. Locking protrusion; 46. Transition surface; 47. Guide slope; 48. Second bayonet; 5. Indicator; 51. Indicator surface; 52. Pressure-bearing boss; 53. Second stop surface; 54. Driven part; 55. First bayonet; 61. First elastic element; 62. Second elastic element; 63. Elastic reset element; 7. Rotating wheel; 71. Limiting block; 8. Mechanism latch; 81. Drive part; 9. Leakage trip structure; 91. Leakage trip device; 92. Push plate; 93. Push plate torsion spring. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example This embodiment provides, as follows: Figure 1-14 The circuit breaker leakage protection indicating device shown includes: The housing 1 has a viewing window 11; The first locking structure includes a first latch 2 and a jumper 3 rotatably disposed on the housing 1. The first latch 2 and the jumper 3 are brought closer to each other and rotated through an elastic structure, so that the first latch 2 and the jumper 3 are connected to form a locking engagement that keeps their relative positions locked. The second locking structure includes a second latch 4 and an indicator 5 rotatably disposed on the housing 1, and an elastic reset member 63 connecting the second latch 4 and the indicator 5. The elastic reset member 63 keeps the second latch 4 and the indicator 5 in a close association, that is, the elastic reset member 63 applies an elastic force to the second latch 4 and the indicator 5 to bring them closer together. This elastic force drives the indicator to tend to move towards the side closer to the viewing window. The indicator 5 moves away from the viewing window 11 under the drive of the circuit breaker operating mechanism and forms a locking engagement with the second latch 4. The second latch 4 is disposed on the movement path of the jumper 3 and is driven by the jumper 3 to release the locking engagement with the indicator 5. The leakage current tripping structure 9 is disposed in the housing 1 to drive the first latch 2 to operate. When the circuit breaker has a leakage current fault, the leakage current tripping structure 9 drives the first latch 2 and the trip latch 3 to first unlock, and then drives the second latch 4 to unlock the indicator 5 through the trip latch 3, so that the indicator 5 is reset to the position of the viewing window 11 under the action of the elastic reset member 63, and the unlocked trip latch 3 drives the operating mechanism to perform the tripping action.

[0028] The above-described implementation method is the core technical solution of this embodiment. Through the linkage design between the leakage current tripping structure, the first locking structure, and the second locking structure, a dedicated indication for leakage current faults is achieved. When the circuit breaker is working normally, the indicator 5 is driven away from the viewing window 11 by the operating mechanism and locks with the second latch 4. When a leakage current fault occurs, the leakage current tripping structure 9 will drive the first latch 2 and the trip latch 3 to unlock, and then trigger the second latch 4 to unlock through the trip latch 3. The indicator 5 can be automatically reset to the position of the viewing window 11 under the elastic force of the elastic reset member 63 without manual intervention. This eliminates the need for manual reset steps and avoids locking failure caused by misalignment. Users can directly determine the cause of the trip through the viewing window 11 without additional troubleshooting, greatly improving maintenance efficiency. The leakage current protection indicator device adopting this technical solution forms a double insurance through a two-level locking and tripping linkage mechanism. The first-level locking is maintained by an elastic structure to maintain the locking cooperation between the first latch 2 and the trip latch 3. Only the leakage current tripping structure can trigger the unlocking, avoiding false locking in non-leakage scenarios. The second-level locking is an indication lock between the second latch 4 and the indicator 5. Only the unlocked trip latch 3 can trigger the second latch 4 to unlock the indicator 5, avoiding false reset of the indicator due to accidental loosening of the second latch. These two levels of locking restrict each other and trigger layer by layer to ensure that the indication action strictly corresponds to the leakage current fault. Ultimately, it achieves the technical goals of accurate indication of leakage current fault, automatic and error-free action, and stable and anti-interference structure, significantly improving the safety performance and user experience of the leakage current circuit breaker.

[0029] The following is combined with Figure 1-4 , Figure 6-7 The specific configuration of the first latch 2 and the jump latch 3 is described in detail below: The elastic structure includes a first elastic element 61 disposed on the housing 1 and connected to the first latch 2, and a second elastic element 62 disposed on the housing 1 and connected to the jump buckle 3. The first latch 2 tends to rotate towards the jump buckle 3 under the action of the first elastic element 61, and the jump buckle 3 tends to rotate towards the first latch 2 under the action of the second elastic element 62. The first latch 2 has a first stop surface 21 at one end near the jump buckle 3, and the jump buckle 3 has a corresponding first stop surface 35 that abuts against the first stop surface 21 to form a locking engagement. Further, the first elastic element 61 is sleeved on the first latch. The locking torsion spring on the rotating shaft of the first lock 2 has one end connected to the limiting groove formed by the first lock 2, and the other end extending to abut against the housing 1. The first elastic element 61 causes the first lock 2 to tend to maintain a locked engagement with the jump buckle 3. With this structure, the first lock 2 and the jump buckle 3 form a reliable mechanical lock through the contact engagement of the first stop surface 21 and the first stop surface 35. With the elastic force provided by the first elastic element 61 and the second elastic element 62 respectively, the first lock and the jump buckle tend to rotate closer to each other to maintain the locking tendency, avoiding accidental unlocking due to vibration or small displacement, and making the locking stability stronger.

[0030] To ensure that the trip latch 3 can reset after being unlocked and released from the first latch 2, a rotating wheel 7 is rotatably mounted on the housing 1 to form a limiting engagement with the trip latch 3. The rotating wheel 7 is equipped with a limiting block 71 that partially overlaps with the movement trajectory of the trip latch 3. Since the rotating wheel 7 is linked to the handle 12, the rotating wheel 7, through the limiting block 71, partially overlaps with the movement trajectory of the trip latch 3, thereby limiting and constraining the trip latch 3. When the circuit breaker releases the leakage fault and restarts, the rotating wheel 7 rotates with the handle 12, and through the limiting block 71, pushes the trip latch 3 to reset and rotate, so that the trip latch 3 returns to the locked engagement position with the first latch 2, ensuring the accuracy of the trip latch reset action and preparing for the next leakage trip action.

[0031] like Figure 11As shown, the jump buckle 3 includes a round shaft portion with a shaft hole, and a first jump buckle arm 31, a second jump buckle arm 32, a third jump buckle arm 33, and a fourth release arm 34 spaced around the shaft hole on the side wall of the round shaft portion. The second elastic element 62 is a tension spring structure with one end fixed to the housing 1 and the other end extending and connected to the third jump buckle arm 33. The jump buckle 3 forms a limiting engagement with the limiting block 71 of the rotating wheel 7 through the first jump buckle arm 31. A first stop surface 35 is formed at the root position where the first jump buckle arm 31 connects to the round shaft portion. It also includes a drive groove 36 formed between the first jump buckle arm 31 and the second jump buckle arm 32. The fourth release arm 34 extends and engages with the release shaft of the operating mechanism. The second latch 4 is engaged and connected in the drive groove 36. From the above structure, it can be seen that the jump buckle 3 adopts a structural layout of a round shaft portion and four spaced jump buckle arms 3, realizing modular partitioning of functions. The first jump buckle arm 31 is responsible for forming a limiting engagement with the limiting block 71 of the rotating wheel 7. The system ensures the accuracy of trip reset. The third trip arm 33 connects to the second elastic element 62, providing a stable elastic driving force to maintain the trip arm 3's locking tendency with the first latch 2. Furthermore, after unlocking, the trip arm 3 achieves rapid trip rotation with the help of the second elastic element 62. Through the drive slot 36 formed between the first and second trip arms 31 and 32, it cooperates with the second latch 4 to achieve precise transmission for unlocking the second latch, allowing the indicator 5 to be promptly reset to the viewing window under the action of the elastic reset element 63. Simultaneously, the cooperation of the fourth trip arm and the trip shaft directly drives the trip shaft of the operating mechanism, enabling the operating mechanism to quickly execute the leakage current trip. Therefore, this trip arm structure, through its integrated design of precise transmission, locking cooperation, indicator unlocking drive, and trip trip drive, becomes the core hub of the action linkage in the leakage current protection indicator device. It ensures the synchronization and accuracy of leakage current indication and circuit breaker tripping, while also improving the system's reliability and compactness.

[0032] The following is combined with Figure 1-4 , Figure 6-7 The arrangement of the second latch and indicator is explained in detail: The indicator 5 is rotatably mounted on the housing 1 coaxially with the jump buckle 3. The second latch 4 is rotatably mounted on the upper side of the jump buckle 3. The elastic reset member 63 is a reset torsion spring with its two ends respectively abutting against the second latch 4 and the indicator 5. The indicator 5 includes an indicator surface 51 at its top and a pressure-receiving boss 52 on the bottom side of the indicator surface 51, as well as a second stop surface 53 on one side of the pressure-receiving boss 52. The second latch 4 includes a first linkage rod 41 that extends and contacts the pressure-receiving boss 52 under the action of the elastic reset member 63, and a second stop surface 43 on the first linkage rod 41 that forms a locking fit with the second stop surface 53. The elastic force of the reset torsion spring keeps the second stop surface 43 and the second stop surface 53 locked. The side wall of the indicator 5 is provided with a first latch 55 for positioning and connecting one end of the reset torsion spring, and the first linkage rod 41 is provided with a second latch 47 for positioning and connecting the other end of the reset torsion spring. The first latch 55 and the second latch 47 limit the installation of the two ends of the reset torsion spring. Functionally, the indicator 5 moves away from the viewing window 11 under the drive of the operating mechanism and forms a locking engagement with the second latch 4. The specific engagement method between the indicator 5 and the operating mechanism is as follows: the operating mechanism includes a mechanism latch 8 for driving the indicator 5 to move away from the viewing window 11. The mechanism latch 8 has a driving part 81 protruding to one side of the indicator 5. The indicator 5 is provided with a driven part 54 that abuts against the driving part 81 in a misaligned engagement. The driven part 54 and the pressure boss 52 are arranged vertically opposite each other. A movable groove is formed between the two, into which the first linkage rod 41 can pass. The second latch 4 includes a locking protrusion 44 provided on the first linkage rod 41. The locking protrusion 44 is provided with a transition surface 45 that contacts the bottom surface of the pressure boss 52 and a second stop surface 43 and a guide slope 46 connected on both sides of the transition surface 45. When the driven part 81 pushes the driven part, the indicator 5 rotates relative to the second latch, so that the second stop surface 53 moves out of the bottom of the pressure boss 52 and abuts against the second stop surface 43.

[0033] The advantage of the above structural design is that when the circuit breaker performs a normal closing operation, the mechanism latch 8 of the operating mechanism pushes the driven part 54 of the indicator 5 through the drive part 81, forcing the indicator 5 to overcome the force of the reset torsion spring and rotate away from the viewing window 11. During this rotation, the pressure boss 52 on the indicator 5 slides along the locking protrusion 44 of the second latch 4 and presses down, forcing the second latch 4 to produce a slight reverse rotation. When the indicator 5 rotates to the designated position, the second stop surface 53 slides over the locking protrusion 44 and finally abuts against the second stop surface 43 on the second latch 4. The elastic force of the reset torsion spring keeps the second stop surface 43 and the second stop surface 53 in a continuous locking tendency, strengthening the locking stability, thereby keeping the indicator 5 and the second latch 4 locked together. At this time, the indicator 5 is reliably locked in a non-display position away from the viewing window 11. In a further preferred configuration, the second latch 4 has a second linkage rod 42 movably disposed in the drive slot 36 of the trip latch 3. When the trip latch 3 is unlocked and rotated, it drives the second linkage rod 42 to rotate the second latch 4. With this structure, only when the circuit breaker trips due to a leakage fault, the first latch 2 is driven by the leakage trip structure 9 to release the lock on the trip latch 3. The trip latch 3 is released and rotates, and the second linkage rod 42 of the second latch 4 is pushed through the drive slot 36 on the trip latch, thereby driving the second stop surface 43 to disengage from the second stop surface 53, forcing the second latch 4 to rotate and unlock the indicator 5. After unlocking, the indicator 5 quickly rotates back under the action of the reset torsion spring, and its indicator surface instantly springs back to the position of the viewing window, completing the leakage status indication function.

[0034] In this embodiment, reference Figure 5 , Figure 8-9 As shown, the housing 1 is provided with a trip hole 10, and the operating mechanism includes a trip shaft disposed in the trip hole 10. The fourth trip arm of the trip buckle 3 extends to the trip hole 10 and is provided with a trip boss 37 that cooperates with the trip shaft. During the unlocking rotation process, the trip buckle 3 drives the trip shaft through the fourth trip arm 34 to trigger the operating mechanism to perform a tripping action. In this structural configuration, the trip latch 3 directly drives the trip shaft of the mechanism latch 8 via the fourth trip latch arm. This fourth trip latch arm acts as a lever arm extending from the rotating shaft of the trip latch 3, and the end of its movement trajectory can be precisely positioned at the trip hole on the housing 1. This facilitates the miniaturization and compact design of the leakage current module. By rationally designing the length of the fourth trip latch arm and the position of the trip boss, the force and stroke on the trip shaft can be optimized. Based on the fact that the trip latch has a large rotational kinetic energy when tripping, this kinetic energy can be converted into a sufficient impact force and accurate movement stroke on the trip shaft through the lever principle, ensuring that the operating mechanism latch can be reliably released, overcoming the resistance of the mechanism spring, and completing the mechanism tripping action.

[0035] like Figure 1-2 As shown, the first latch 2 rotates within the area between the first latch arm 31 and the third latch arm 33 of the latch 3, and is positioned opposite to the leakage current tripping structure 9. The latch 3 rotates between the mechanism latch 8 and the indicator 5. The second latch 4 is connected between the first latch arm 31 and the second latch arm 32 of the latch 3. The first latch 2 makes full use of the unused space around the latch 3 and shortens the transmission path from the latch 3 to the second latch 4. When leakage current tripping occurs, the latch 3 can quickly drive the second latch 4 to unlock, thereby causing the indicator 5 to reset synchronously. This layout design achieves compact integration of various components, allowing the first locking structure, the second locking structure, and the leakage current tripping structure to be highly integrated around the hinge of the latch, greatly reducing the area occupied by the entire leakage current module. The compact structural layout is beneficial for the miniaturization design of the circuit breaker.

[0036] In order to reliably achieve the triggering action of the leakage current tripping structure 9 on the first latch 2, refer to Figure 1-2 The leakage current tripping structure 9 includes a leakage current tripping device 91 disposed in the housing 1, a push plate 92 rotatably connected between the leakage current tripping device 91 and the first latch 2, and a push plate torsion spring 93 connecting the push plate 92 and the mechanism latch 8. The top rod of the leakage current tripping device 91 is connected to the push plate 92. The other end of the first latch 2 is provided with a latch rod 22 located on the rotation path of the push plate 92. With this structure, when the leakage current tripping device 91 is triggered due to a leakage current fault, its top rod pushes the push plate 92. The push plate 92 rotates, driving the first latch 2 to rotate via the latch rod 22, thereby triggering the unlocking action between the first latch 2 and the trip latch 3. The action response is rapid, ensuring that the circuit breaker can be quickly tripped after a leakage fault occurs. In this embodiment, the lever transmission of the push plate 92 can optimize the force transmission efficiency, so that the push rod force of the leakage trip device can be reasonably amplified, ensuring that the first latch can be reliably unlocked under low power consumption. After the tripping action is completed, the push plate torsion spring can drive the push plate to automatically reset, preparing for the next leakage tripping action.

[0037] like Figure 9As shown, the housing 1 includes a circuit breaker housing 14 and a base 13 fitted into the circuit breaker housing. The first locking structure and the second locking structure are disposed on the base 13. The leakage current tripping structure, the operating mechanism, and the mechanism latch are disposed in the circuit breaker housing 14. The driving part 81 of the mechanism latch 8 passes through the base and cooperates with the indicator. The base has a tripping hole 10 communicating with the circuit breaker housing. The tripping shaft of the operating mechanism is movably disposed in the tripping hole and cooperates with the fourth tripping arm 34 of the tripping latch 3. This structural layout design concentrates the core structure of leakage current protection in the base and concentrates the circuit breaker operating mechanism in the circuit breaker housing, realizing the physical separation and logical linkage of functional modules, realizing modular installation design, facilitating maintenance, and reducing maintenance costs and time.

[0038] The working principle of the leakage current tripping of the leakage current protection indicator device is explained below: 1. The leakage protection indicator is in the initial locked state: the first latch 2 and the trip latch 3 form a surface contact lock through the first stop surface 21 and the first stop surface 35, and the first elastic member 61 and the second elastic member 62 respectively provide elastic force to keep the two locked; in addition, the second latch 4 and the indicator 5 form a contact lock through the second stop surface 43 and the second stop surface 53, and the elastic reset member 63 keeps the two locked, and the indicator 5 is in a hidden position away from the viewing window 11.

[0039] II. Leakage protection indicator tripping action: When a leakage fault occurs in the circuit breaker, the top rod of the leakage trip device 91 extends and pushes the push plate 92 to rotate. The push plate 92 drives the first latch 2 to rotate around the axis, so that the first stop surface 21 and the first stop surface 35 of the trip latch 3 are unlocked. After unlocking, the trip latch 3 rotates under the pulling force of the second elastic element 62, and drives the second latch 4 to rotate around the axis, so that the second stop surface 43 and the second stop surface 53 of the indicator 5 are unlocked. After unlocking, the indicator 5 rotates around the same axis as the trip latch 3 under the elastic force of the reset torsion spring, and the indicator surface 51 is reset to the position of the viewing window 11, which directly displays the leakage fault. During this process, when the trip latch 3 rotates, it drives the trip shaft of the operating mechanism through the fourth trip latch arm, triggering the operating mechanism to perform the tripping action, thus completing the leakage protection.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A circuit breaker leakage current protection indicating device, characterized in that, include: The housing (1) has a viewing window (11); The first locking structure includes a first latch (2) and a jumper (3) rotatably disposed on the housing (1). The first latch (2) and the jumper (3) rotate toward each other through an elastic structure, so that the first latch (2) and the jumper (3) are connected to form a locking engagement that keeps their relative positions locked. The second locking structure includes a second latch (4) and an indicator (5) rotatably disposed on the housing (1), and an elastic reset member (63) connecting the second latch (4) and the indicator (5). The elastic reset member (63) keeps the second latch (4) and the indicator (5) close together. The indicator (5) is driven by the circuit breaker operating mechanism to move away from the viewing window and forms a locking engagement with the second latch (4). The second latch (4) is driven by the jumper (3) to release the locking engagement with the indicator (5). The leakage trip structure (9) is installed in the housing (1) to drive the first latch (2) to operate. When the circuit breaker has a leakage fault, the leakage trip structure (9) drives the first latch (2) and the trip latch (3) to unlock first, and then drives the second latch (4) to unlock the indicator (5) through the trip latch (3), so that the indicator (5) is reset to the position of the viewing window (11) under the action of the elastic reset member (63), and the unlocked trip latch (3) drives the operating mechanism to perform the trip action.

2. The circuit breaker leakage protection indicating device according to claim 1, characterized in that: The second latch (4) is located on the movement path of the jumper (3). The first latch (2) has a first stop surface (21) at one end near the jumper (3). The jumper (3) has a corresponding first stop surface (35) that abuts against the first stop surface (21) to form a locking engagement.

3. The circuit breaker leakage protection indicating device according to claim 1, characterized in that: The elastic structure includes a first elastic element (61) disposed on the housing (1) and connected to the first latch (2), and a second elastic element (62) disposed on the housing (1) and connected to the jump buckle (3). The first latch (2) tends to rotate toward the jump buckle (3) under the action of the first elastic element (61), and the jump buckle (3) tends to rotate toward the first latch (2) under the action of the second elastic element (62), and forms a limiting engagement with the rotating wheel (7) rotatably disposed on the housing (1). The rotating wheel (7) is provided with a limiting block (71) that partially overlaps with the movement trajectory of the jump buckle (3).

4. The circuit breaker leakage protection indicating device according to claim 3, characterized in that: The first elastic element (61) is a lock torsion spring sleeved on the rotating shaft of the first lock (2). One end of the lock torsion spring is connected to the limiting groove formed by the first lock (2), and the other end extends to abut against the housing (1). The first elastic element (61) makes the first lock (2) tend to maintain a locked engagement with the jump buckle (3).

5. The circuit breaker leakage protection indicating device according to claim 3, characterized in that: The jump buckle (3) includes a round shaft portion with a shaft hole, and a first jump buckle arm (31), a second jump buckle arm (32), a third jump buckle arm (33) and a fourth release arm (34) arranged at intervals around the shaft hole on the side wall of the round shaft portion. The second elastic element (62) is a tension spring structure with one end fixed to the housing (1) and the other end extending and connected to the third jump buckle arm (33). The jump buckle (3) forms a limiting engagement with the limiting block (71) of the rotating wheel (7) through the first jump buckle arm (31). A first stop surface (35) is formed at the root position where the first jump buckle arm (31) is connected to the round shaft portion.

6. The circuit breaker leakage protection indicating device according to any one of claims 1-5, characterized in that: The indicator (5) is rotatably mounted on the housing (1) coaxially with the jump buckle (3). The second latch (4) is rotatably mounted on the upper side of the jump buckle (3). The elastic reset member (63) is a reset torsion spring with its two ends abutting against the second latch (4) and the indicator (5) respectively. The indicator (5) includes an indicator surface (51) at its top and a pressure boss (52) at the bottom side of the indicator surface (51), and a second stop surface (53) on one side of the pressure boss (52). The second latch (4) includes a first linkage rod (41) that extends and contacts the pressure boss (52) under the action of the elastic reset member (63), and a second stop surface (43) that is mounted on the first linkage rod (41) and forms a locking fit with the second stop surface (53). The side wall of the indicator (5) is provided with a first slot (55) for positioning and connecting one end of the reset torsion spring, and the first linkage rod (41) is provided with a second slot (47) for positioning and connecting the other end of the reset torsion spring.

7. The circuit breaker leakage protection indicating device according to claim 6, characterized in that: The operating mechanism includes a mechanism latch (8) for driving the indicator (5) to move away from the viewing window (11). The mechanism latch (8) has a driving part (81) protruding towards one side of the indicator (5). The indicator (5) is provided with a driven part (54) that abuts against the driving part (81) in a misaligned engagement. The driven part (54) and the pressure boss (52) are arranged vertically opposite to each other and form a movable groove between them into which the first linkage rod (41) can pass. The second latch (4) includes a mechanism latch provided with the first linkage rod (51) in the second linkage rod (52). A locking protrusion (44) on a linkage rod (41) is provided with a transition surface (45) that engages with the bottom surface of the pressure boss (52) and a second stop surface (43) and a guide slope (46) connected on both sides of the transition surface (45). When the driven part (81) pushes the driven part (54), the indicator (5) rotates relative to the second latch (4) so ​​that the second stop surface (53) moves out of the bottom of the pressure boss (52) and abuts against the second stop surface (43).

8. The circuit breaker leakage protection indicating device according to claim 6, characterized in that: The jump buckle (3) includes a drive slot (36) formed between the first jump buckle arm (31) and the second jump buckle arm (32). The second lock (4) has a second linkage rod (42) movably disposed in the drive slot (36). When the jump buckle (3) is unlocked, it drives the second linkage rod (42) to rotate the second lock (4), thereby causing the second stop surface (43) to disengage from the second stop surface (53) to release the locking engagement between the second lock (4) and the indicator (5).

9. The circuit breaker leakage protection indicating device according to claim 1, characterized in that: The housing (1) is provided with a trip hole (10), and the operating mechanism includes a trip shaft disposed in the trip hole (10). The fourth trip arm of the trip buckle (3) extends to the trip hole (10) and is provided with a trip boss (37) that cooperates with the trip shaft. During the unlocking rotation process, the trip buckle (3) drives the trip shaft to move through the fourth trip arm, thereby triggering the operating mechanism to perform the tripping action.

10. The circuit breaker leakage protection indicating device according to claim 1, characterized in that: The first latch (2) is rotatably located in the area between the first latch arm (31) and the third latch arm (33) of the latch (3), and is disposed opposite to the leakage trip structure (9). The latch (3) is rotatably located between the mechanism latch (8) and the indicator (5). The leakage trip structure (9) includes a leakage trip device (91) disposed in the housing (1), a push plate (92) rotatably connected between the leakage trip device (91) and the first latch (2), and a push plate torsion spring (93) connected between the push plate (92) and the mechanism latch (8). The top rod of the leakage trip device (91) is connected to the push plate (92). The other end of the first latch (2) is provided with a latch rod (22) located on the rotation path of the push plate (92).

11. The circuit breaker leakage protection indicating device according to claim 9 or 10, characterized in that: The housing (1) includes a base (13) and a circuit breaker housing (14) fitted and connected to the base. The first locking structure and the second locking structure are disposed in the base (13). The leakage tripping structure, the operating mechanism and the mechanism latch (8) are disposed in the circuit breaker housing (14). The driving part (81) of the mechanism latch (8) passes into the base and cooperates with the indicator.

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