A tripping device opening and closing structure of an electric leakage circuit breaker

Abstract

The utility model relates to a tripping device opening and closing structure of leakage circuit breaker, through the tripping opening and closing assembly, tripping device etc. are integrated in the casing that is composed of middle seat, air switch cover and leakage cover, and each component layout is compact and reasonable, and the driving lever is arranged in the air switch cover side, and the N pole lever is arranged in the leakage cover side, and both realize linkage through the shaft connection, and this kind of layout makes the transmission of opening and closing action more direct and efficient, reduces energy loss and action delay, in addition, the N pole lock catch is connected with the N pole lever through the connecting shaft between the middle seat and the leakage cover on the casing, and the connecting mode guarantees the stability and reliability of the lock catch structure, and can accurately realize the locking and unlocking function in the opening and closing process, and simultaneously, one end of the N pole reset button is equipped with a clamping block, and the N pole lock catch is correspondingly equipped with a clamping groove, and in the reset state, the clamping block and the clamping groove are clamped together, and form double locking.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a trip unit opening and closing structure for a residual current circuit breaker. Background Technology

[0002] In power systems, residual current circuit breakers (RCCBs) are critical devices for ensuring electrical safety, and the performance of their trip unit's opening and closing structure directly affects the reliability and safety of the RCCB. However, common structures of this type on the market currently suffer from several drawbacks: component layout is scattered, resulting in large product size, high cost, and space consumption; long connection lines between the trip unit and the trip mechanism lead to significant energy loss, delayed action, and reduced protection performance; the simple locking mechanism design with a single locking method is prone to wear and deformation under complex environments and vibrations, resulting in locking failure and affecting opening, closing, and fault protection; mechanical isolation protection is lacking, components are prone to interference and wear, resulting in short lifespan and poor shock resistance; electrical connection shaft support is insufficient, making them prone to deformation and damage, leading to poor contact or short circuits; electrical connection design is neglected, lacking positioning and fixing devices, inaccurate N-pole lock reset, and abnormal contact between moving and stationary contacts, which may cause electrical fires in the long term; finally, the design and installation of the test button and related components are unreasonable, making them prone to displacement and loosening, failing to accurately trigger the trip unit, affecting performance testing, and reducing safety and reliability. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a trip unit opening and closing structure for a leakage current circuit breaker that is compact and reasonable in structure, has a dual locking mechanism, stable mechanical and electrical performance, and reliable electrical connection.

[0004] To achieve the above objectives, this utility model employs a trip unit opening and closing structure for a residual current circuit breaker, comprising a housing, which is composed of a center seat, a circuit breaker cover, and a residual current cover. A trip opening and closing assembly and a trip unit are disposed within the housing. The trip opening and closing assembly includes a neutral (N) reset button, a reset button spring, and an opening and closing component. The N-pole reset button extends outside the housing through a button groove and its shaft end is connected to the reset button spring. The opening and closing component includes a drive lever and an N-pole lever. The drive lever is located on one side of the circuit breaker cover, and the N-pole lever... The rod is located on one side of the leakage cover, and the two are connected by a shaft. An N-pole latch is provided on one side of the N-pole lever. The N-pole latch is connected to the N-pole lever through the connecting shaft between the upper middle seat of the housing and the leakage cover. A latching spring is wound around the N-pole latch. A moving contact is sandwiched inside the N-pole lever. The moving contact is connected to the N-pole lever by a shaft. The trip unit is located inside the housing and on one side of the N-pole latch. A reset piece is provided between the trip unit and the N-pole latch. One end of the N-pole reset button is provided with a snap-fit ​​block. The N-pole latch is provided with a corresponding snap-fit ​​groove corresponding to the snap-fit ​​block.

[0005] The advantages of the above structure are as follows: By integrating the tripping and closing components, trip unit, etc., into a housing consisting of a center seat, circuit breaker cover, and leakage current cover, the layout of each component is compact and reasonable. The drive lever is located on one side of the circuit breaker cover, and the N-pole lever is located on the side of the leakage current cover. The two are linked by a shaft. This layout makes the transmission of the opening and closing action more direct and efficient, reducing energy loss and action delay. In addition, the N-pole latch is connected to the N-pole lever through the connecting shaft between the center seat and the leakage current cover on the upper part of the housing. This connection method ensures the stability and reliability of the latch structure and can accurately... The circuit breaker achieves locking and unlocking functions during opening and closing. Simultaneously, one end of the N-pole reset button has a locking block, and the corresponding N-pole latch has a corresponding locking slot. In the reset state, the locking block and the locking slot engage together, forming a double lock. Furthermore, the N-pole reset button also has a leakage current indication function. The circuit breaker can only close when the N-pole reset button is pressed. When leakage current trips, the N-pole reset button will automatically spring back up to visually indicate the leakage fault. Under normal short-circuit or overload conditions, the N-pole reset button will not activate, thus facilitating user differentiation of different types of faults.

[0006] This utility model further includes a partition plate in the circuit breaker assembly. The partition plate is connected to the connecting shaft between the middle seat of the housing and the leakage cover, and is located between the N-pole latch and the housing, and is fixedly mounted on the middle seat. The partition plate has corresponding protrusions for the reset button spring. The partition plate not only provides isolation and protection, preventing unnecessary interference between the N-pole latch and other components, but also enhances the structural stability of the entire circuit breaker assembly, improving the product's seismic resistance and reliability.

[0007] This utility model is further configured to include an operating handle, a handle linkage, and a stationary contact assembly within the housing. The operating handle is connected to a drive lever via the handle linkage. The stationary contact assembly includes a stationary contact installed within the housing and a stationary contact point disposed on the stationary contact. The moving contact has a moving contact point corresponding to the stationary contact point. The reset plate has a reset point, and the trip unit has a trip point corresponding to the reset point. The operating handle is connected to the drive lever via the handle linkage, thereby enabling the operating handle to control the drive lever. The stationary contact assembly includes a stationary contact installed within the housing and a stationary contact point disposed on the stationary contact. The moving contact has a moving contact point corresponding to the stationary contact. The contact and separation of the moving contact and the stationary contact control the on / off state of the circuit. In addition, the reset plate has a reset point, which is used to contact the N-pole latch to achieve reset. The trip unit has a trip point corresponding to the reset point. When a circuit fault occurs, this trip protection mechanism can respond to the fault signal in a timely manner, quickly cut off the power supply, effectively prevent the escalation of electrical accidents, and protect personal and equipment safety.

[0008] This utility model is further configured to include a test button, a test button spring, and a first copper tube, a second copper tube, and a third copper tube within the housing, which are wrapped around the connecting shaft portion between the housing seat and the leakage cover. The test button extends to the outside of the housing through a test groove portion opened on the housing. The test button spring is located between the reset plate and the N-pole reset button and is wound around the second copper tube. The first copper tube and the third copper tube are both located on one side of the trip unit. One end of the test button spring is placed on the test button, and the other end is placed at the lower end of the first copper tube. The third copper tube is placed at the lower end of the test button. The copper tube wrapped around the connecting shaft not only serves as an electrical connection but also provides mechanical support. During the opening and closing operation of the residual current circuit breaker, the connecting shaft will bear certain mechanical stress. The support of the copper tube can enhance the strength and stability of the connecting shaft, preventing it from deforming or being damaged due to excessive force, thereby ensuring the normal operation of the entire opening and closing structure. The test button spring is wound around the second copper tube, and its installation position and elastic deformation range are determined by its relative position to the first and third copper tubes. This helps to fix the position of the test button spring, preventing it from shifting or loosening during operation, and ensuring that the test button can accurately trigger the trip unit.

[0009] This utility model is further configured such that a drive latch is connected to one side of the drive lever. The drive latch has a stop shaft, and the drive latch has a shaft opening at the stop shaft position via a central seat, extending parallel to the direction of the N-pole lever to one side of the N-pole lever. The stop shaft is used to limit the N-pole latch to a preset position during reset. The stop shaft plays a crucial positioning role during N-pole latch reset, limiting the N-pole latch to a preset position. The presence of the stop shaft ensures that the N-pole latch reaches the same and accurate position each time it resets, thereby ensuring that the contact pressure and contact area between the moving contact and the stationary contact meet the design requirements and guaranteeing the reliability of the electrical connection. Attached Figure Description

[0010] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0011] Figure 2 This is a schematic diagram of the internal structure of the shell according to an embodiment of the present invention.

[0012] Figure 3 This is a schematic diagram of the structure of the shell without a partition in an embodiment of the present invention.

[0013] Figure 4 This is a schematic diagram of the linkage between the driving lever and the N-pole lever in an embodiment of this utility model.

[0014] Figure 5This is a schematic diagram showing the connection between the N-pole lever, the N-pole latch, and the moving contact in an embodiment of this utility model. Detailed Implementation

[0015] like Figures 1-5 As shown, an embodiment of this utility model provides a tripping and closing structure for a residual current circuit breaker, including a housing 1. The housing 1 is composed of a middle seat 11, a circuit breaker cover 12, and a residual current cover 13. A tripping and closing assembly 2 and a tripping device 3 are provided inside the housing 1. The tripping and closing assembly 2 includes an N-pole reset button 21, a reset button spring 22, and a tripping and closing assembly 4. The tripping and closing assembly 4 includes a drive lever 41 disposed on one side of the circuit breaker cover 12 and an N-pole lever 42 disposed on one side of the residual current cover 13. The two are connected by a shaft. An N-pole latch 43 is provided on one side of the N-pole lever 42. The N-pole latch 43 is connected to the N-pole lever 42 through a connecting shaft 14 between the middle seat 11 and the residual current cover 13 on the housing 1. A latch spring 431 is wound around the N-pole latch 43. A moving contact 44 is sandwiched inside the N-pole lever 42. The moving contact 44 is connected to the N-pole lever 42 by a shaft.

[0016] The trip unit 3 is disposed inside the housing 1 and located on one side of the N pole latch 43. The housing 1 also includes an operating handle 6, a handle linkage 61, and a stationary contact assembly 7. The operating handle 6 is connected to the drive lever 41 through the handle linkage 61. The stationary contact assembly 7 includes a stationary contact 71 installed inside the housing 1 and a stationary contact 72 disposed on the stationary contact 71. The moving contact 44 is provided with a moving contact 441 corresponding to the stationary contact 72. A reset piece 5 is provided between the trip unit 3 and the N pole latch 43. The reset piece 5 is provided with a reset point 51 for contacting and resetting the N pole latch 43. The trip unit 3 is provided with a trip point 31 corresponding to the reset point 51. One end of the N pole reset button 21 is provided with a locking block 211. The N pole latch 43 is provided with a corresponding slot 432 corresponding to the locking block 211.

[0017] The circuit breaker assembly 4 is also provided with a partition plate 45. The partition plate 45 is connected to the connecting shaft 14 between the middle seat 11 of the housing 1 and the leakage cover 13, and is located between the N pole latch 43 and the housing 1, and is fixedly installed on the middle seat 11. The partition plate 45 is provided with a corresponding protrusion 451 corresponding to the reset button spring 22.

[0018] In addition, the housing 1 also includes a test button 8, a test button spring 9, and a first copper tube 15, a second copper tube 16, and a third copper tube 17 wrapped around the connecting shaft between the housing 1 seat 11 and the leakage cover 13. The test button 8 extends to the outside of the housing 1 through the test groove opened on the housing 1. The test button spring 9 is located between the reset piece 5 and the N-pole reset button 21 and is wound around the second copper tube 16. The first copper tube 15 and the third copper tube 17 are both located on one side of the trip unit 3. One end of the test button spring 9 is placed on the test button 8, and the other end is placed at the lower end of the first copper tube 15. The third copper tube 17 is placed at the lower end of the test button 8.

[0019] A drive latch 10 is also connected to one side of the drive lever 41. The drive latch 10 is provided with a stop shaft 101. The drive latch 10 has a shaft opening at the position of the stop shaft 101 through the middle seat 11, and extends to one side of the N pole lever 42 in a direction parallel to the N pole lever 42. The stop shaft 101 is used to limit the reset to a preset position when the N pole latch 43 is reset.

[0020] The working principle of the above-mentioned residual current circuit breaker trip unit's opening and closing structure is as follows: When closing is required, the operating handle 6 is pushed. The operating handle 6 transmits power to the drive lever 41 through the handle connecting rod 61. After receiving power, the drive lever 41 begins to rotate. Since the drive lever 41 is connected to the N-pole lever 42 through a shaft, it will drive the N-pole lever 42 to move together. During the movement, the N-pole lever 42 will overcome the elastic force of the locking spring 431, causing the N-pole locking 43 to undergo a certain displacement or rotation, preparing for subsequent locking and contact closure. As lever 42 continues to move, the moving contact 44 clamped within the N-pole lever 42 also moves. When the moving contact 441 on the moving contact 44 contacts the stationary contact 72 in the stationary contact assembly 7, the circuit is turned on, completing the closing operation. Simultaneously, during the closing process, the locking block 211 at one end of the N-pole reset button 21 engages with the locking groove 432 on the N-pole latch 43, forming a double lock to ensure the stability of the closing state. When the N-pole latch 43 is reset (closed in place), the stagnant shaft 101 on the drive latch 10 will limit the N-pole... The latch 43 is reset to the preset position to ensure the accuracy and stability of the structure after closing. When a fault such as leakage or overload occurs in the circuit, the trip unit 3 will detect the fault signal. The trip point 31 on the trip unit 3 interacts with the reset point 51 on the reset piece 5, causing the reset piece 5 to shift or rotate, thereby releasing the constraint on the N-pole latch 43. At this time, the latch spring 431 wrapped around the N-pole latch 43 releases its elastic force, pushing the N-pole latch 43 to move, thus releasing the locking relationship between it and the N-pole lever 42. The N-pole lever 42 loses its N-pole connection. After the pole lock 43 is locked, it moves under the action of the relevant spring force, which drives the moving contact 44 to move, causing the moving contact 441 to separate from the stationary contact 72, thereby cutting off the circuit and realizing the tripping operation, which plays a role in protecting the circuit and equipment. After tripping, the N pole reset button 21 remains in a certain state under the action of the reset button spring 22, preparing for the next closing operation. When the fault is cleared, the N pole reset button 21 needs to be pressed manually to make the locking block 211 re-engage with the locking slot 432 to complete the reset operation, so that the circuit can be closed again.

[0021] The working principle of the test button 8 and test button spring 9 in the tripping structure of the residual current circuit breaker is as follows: The test button spring 9 is in a certain pre-compression state, with one end placed on the test button 8 and the other end placed on the lower end of the first copper tube 15, applying an upward elastic force to the test button 8. This allows the test button 8 to be stably positioned in its initial position, extending out of the housing 1 through the test slot, when no external force is applied. When a residual current protection function test is required, the test button 8 is manually pressed. At this time, the test button 8 moves downward against the elastic force of the test button spring 9. Since the test button spring 9 is wound around the second copper tube 16 and the third copper tube 17 is placed at the lower end of the test button 8, as the test button 8 is pressed, it will trigger the internal... The test mechanism involves simulating a leakage current signal, which is detected by the trip unit 3. The trip unit 3 then activates, and its trip point 31 interacts with the reset point 51 on the reset piece 5, just as when a real leakage current fault occurs in the circuit. This causes the reset piece 5 to shift or rotate, releasing the constraint on the N-pole latch 43. After the trip unit 3 activates, the N-pole latch 43 moves under the action of the latch spring 431, driving the N-pole lever 42 and the moving contact 44, causing the moving contact 441 to separate from the stationary contact 72. The circuit breaker then trips, thus verifying whether the leakage current protection function is normal. After the test is completed, the test button 8 is released. The test button 8 resets upward under the elastic force of the test button spring 9, returning to its initial position, preparing for the next test.

[0022] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A trip unit opening and closing structure for a residual current circuit breaker, characterized in that: The device includes a housing comprising a center base, a circuit breaker cover, and a leakage current cover. Inside the housing are a tripping and closing assembly and a trip unit. The tripping and closing assembly includes a neutral (N) reset button, a reset button spring, and a tripping and closing component. The N-pole reset button extends outside the housing via a button groove and its shaft end is connected to the reset button spring. The tripping and closing component includes a drive lever and a neutral (N) lever. The drive lever is located on one side of the circuit breaker cover, and the neutral (N) lever is located on the other side of the leakage current cover, connected by a [connection / connection mechanism]. The N-pole lever is connected by a shaft. An N-pole latch is provided on one side of the N-pole lever. The N-pole latch is connected to the N-pole lever through a connecting shaft between the upper middle seat of the housing and the leakage cover. A latching spring is wound around the N-pole latch. A moving contact is sandwiched inside the N-pole lever. The moving contact is connected to the N-pole lever through a shaft. The trip unit is located inside the housing and on one side of the N-pole latch. A reset piece is provided between the trip unit and the N-pole latch. One end of the N-pole reset button is provided with a snap-fit ​​block. The N-pole latch is provided with a corresponding snap-fit ​​groove corresponding to the snap-fit ​​block.

2. The trip unit opening and closing structure of the residual current circuit breaker according to claim 1, characterized in that: The circuit breaker assembly is also provided with a partition plate, which is connected to the connecting shaft between the middle seat of the housing and the leakage cover, and is located between the N pole latch and the housing, and is fixedly installed on the middle seat. The partition plate has a corresponding protrusion for the reset button spring.

3. The trip unit opening and closing structure of the residual current circuit breaker according to claim 2, characterized in that: The housing also includes an operating handle, a handle linkage, and a stationary contact assembly. The operating handle is connected to a drive lever via the handle linkage. The stationary contact assembly includes a stationary contact installed inside the housing and a stationary contact point disposed on the stationary contact. The moving contact has a moving contact point corresponding to the stationary contact point. The reset plate has a reset point, and the trip unit has a trip point corresponding to the reset point.

4. The trip unit opening and closing structure of the residual current circuit breaker according to claim 3, characterized in that: The housing also includes a test button, a test button spring, and a first copper tube, a second copper tube, and a third copper tube wrapped around the connecting shaft between the housing seat and the leakage cover. The test button extends to the outside of the housing through a test groove. The test button spring is located between the reset plate and the N-pole reset button and is wound around the second copper tube. The first copper tube and the third copper tube are both located on one side of the trip unit. One end of the test button spring is placed on the test button, and the other end is placed at the lower end of the first copper tube. The third copper tube is placed at the lower end of the test button.

5. The trip unit opening and closing structure of the residual current circuit breaker according to claim 3, characterized in that: A drive latch is also connected to one side of the drive lever. The drive latch is provided with a stop shaft. The drive latch has a shaft opening at the position of the stop shaft through a middle seat and extends to one side of the N pole lever in a direction parallel to the N pole lever. The stop shaft is used to limit the N pole latch to reset to a preset position when it resets.

Images