Leakage module for small leakage circuit breaker

Abstract

This invention relates to a residual current module for a miniature residual current circuit breaker, comprising a handle, a latch, a trip latch, a torsion spring, a contact frame rotatably disposed within a housing, a spring disposed between the contact frame and the housing, a neutral (N) linear contact that is linked to the contact frame, and a residual current tripping assembly disposed within the housing and cooperating with the trip latch. The handle is connected to the latch via a connecting rod, and one end of the latch is connected to the contact frame via a U-shaped connecting rod. The residual current tripping assembly includes an electromagnetic trip unit, a linkage rod slidably disposed within the housing and linked to the electromagnetic trip unit, and a push rod rotatably disposed within the housing and linked to the linkage rod. The push rod has a driving plane that abuts against one end of the trip latch. The driving plane moves with the push rod, causing the trip latch to move and unlocking the latch and the latch. This invention has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, flexible operation, and sensitive tripping action.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more specifically to a leakage current module of a miniature residual current circuit breaker. Background Technology

[0002] Currently, miniature circuit breakers (MCBs), also known as miniature circuit breakers, are suitable for overload and short-circuit protection of AC 50 / 60Hz lines with a rated voltage of 230 / 400V and a rated current not exceeding 125A. They can also be used for infrequent switching of circuits under normal conditions. MCBs are mainly used in various locations such as industrial, commercial, high-rise, and residential buildings. Miniature residual current circuit breakers (RCCBs) are switches that automatically trip when the leakage current in a circuit exceeds a predetermined value, protecting personal safety and electrical appliances. A miniature RCCB consists of multiple L-line circuit breaker units and an N-line leakage protection module assembled with these L-line circuit breaker units.

[0003] For example, Chinese patent application CN201710462871.9 discloses a residual current tripping mechanism and circuit breaker, proposing a leakage current protection unit with an eccentric action of variable tripping point. Although this leakage current protection unit improves the tripping process, making tripping more effortless and ensuring the functional safety and reliability of the leakage current protection unit, the point of application of the reset plate's latching force is prone to shift during the tripping process, causing the tripping force to change easily, resulting in unstable tripping force and unreliable tripping performance. Furthermore, the existing N-line leakage current protection module has a relatively complex structural design, resulting in slow opening and closing actions, weak breaking capacity, and insensitive leakage current tripping action. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a leakage current module for a small leakage current circuit breaker that is simple in structure, stable and reliable in performance, fast in opening and closing speed, flexible in operation, and sensitive in tripping action.

[0005] To achieve the above objectives, the present invention employs a leakage current module for a miniature leakage current circuit breaker, comprising a handle rotatably disposed within a housing, a latch slidably disposed within the housing, and a rotatably disposed...

[0006] The system includes a trip latch locked within the housing, a torsion spring between the trip latch and the housing, a contact frame rotatably mounted within the housing, a spring between the contact frame and the housing, a neutral linear contact that works in conjunction with the contact frame, and a leakage current tripping assembly within the housing that works with the trip latch. The handle is connected to the lock via a connecting rod, and one end of the lock is connected to the contact frame via a U-shaped connecting rod. The leakage current tripping assembly includes an electromagnetic trip unit, a linkage rod slidably mounted within the housing and working in conjunction with the electromagnetic trip unit, and a push rod rotatably mounted within the housing and working in conjunction with the linkage rod. The push rod has a driving surface that abuts against one end of the trip latch. The driving surface moves with the push rod and drives the trip latch to move, thereby unlocking the trip latch and the lock.

[0007] The advantages of the above structure are as follows: The four-bar linkage design between the handle, latch, trip latch, and contact frame ensures a balanced distribution of operating torque for the leakage current module, preventing excessive or insufficient force during operation and making operation more flexible. The latch adopts a sliding structure design; the handle drives the latch to slide via a linkage, and the latch drives the N-line moving contact frame to quickly perform opening and closing actions via a U-shaped linkage, thus enabling rapid opening and closing of the circuit breaker and faster operation. During leakage current tripping, the latch's arc-shaped locking groove engages with the trip latch, and the electromagnetic trip unit and bimetallic strip can respectively drive the trip latch to operate. The trip latch can quickly unlock from the latch, resulting in more sensitive and reliable tripping action. Therefore, the leakage current module of this miniature circuit breaker has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, flexible operation, and sensitive tripping action.

[0008] Specifically, the other end of the latch has an arc-shaped locking groove that mates with the jump buckle, and one end of the jump buckle has an arc-shaped raised bearing surface that mates with the arc-shaped locking groove. The arc-shaped locking groove rotates with the latch and can engage with the arc-shaped raised bearing surface of the jump buckle, thus locking the latch and the jump buckle together. The arc-shaped raised bearing surface on the jump buckle, which mates with the arc-shaped locking groove, ensures more sensitive disengagement of the jump buckle from the latch.

[0009] Specifically, the handle is provided with a pivot hole for connecting the connecting rod. One end of the connecting rod is inserted into the pivot hole. The latch is provided with a drive hole that mates with the connecting rod. The other end of the connecting rod has a guide hole that passes through the housing and is connected to a guide rod portion within the drive hole. The guide rod portion of the connecting rod moves with the handle and slides back and forth within the guide hole. The latch is slidably mounted within the housing via the connecting rod, facilitating the assembly of the latch and the housing and ensuring reliable operation of the latch within the housing. The latch can quickly drive the N-line moving contact frame.

[0010] This operation helps to accelerate the opening and closing speed of the operating mechanism, resulting in higher reliability of the action.

[0011] Specifically, one end of the linkage rod has a guide portion that abuts against the push rod of the electromagnetic trip unit. The housing contains a guide groove that mates with the guide portion. The guide portion moves with the linkage rod and slides back and forth within the guide groove. The guide portion of the linkage rod is slidably disposed within the guide groove of the housing, thereby ensuring reliable sliding of the linkage rod within the housing.

[0012] Specifically, the other end of the linkage rod has a snap-fit ​​hole, and the push rod is provided with a snap-fit ​​post that mates with the snap-fit ​​hole. The snap-fit ​​post engages within the snap-fit ​​hole, forming a snap-fit ​​connection between the snap-fit ​​post and the push rod. The linkage rod and the push rod are connected by a snap-fit ​​connection, which facilitates their assembly and ensures more reliable transmission between them.

[0013] Specifically, the housing contains a rotating shaft that mates with the push rod. The push rod has a positioning hole that mates with the rotating shaft. The rotating shaft passes through the positioning hole, forming a rotatable connection between the rotating shaft and the push rod. The push rod is rotatably mounted on the rotating shaft within the housing, which facilitates the assembly of the push rod and the rotating shaft, making assembly more convenient and ensuring that the push rod can rotate reliably within the housing.

[0014] Specifically, a contact torsion spring is provided between the contact frame and the N-line moving contact. The contact torsion spring is engaged with the positioning boss of the contact frame, and its two ends are respectively engaged in the first limiting groove and the second limiting groove of the N-line moving contact. The contact torsion spring can increase the contact pressure of the N-line moving contact, thereby ensuring reliable contact between the N-line moving contact and the N-line stationary contact. Furthermore, the snap-fit ​​assembly of the N-line moving contact and the contact frame is beneficial to improving the assembly efficiency of the N-line moving contact and the contact frame. Attached Figure Description

[0015] Figure 1 This is a perspective view of an embodiment of the present invention.

[0016] Figure 2 This is a front view of an embodiment of the present invention.

[0017] Figure 3 This is an exploded view of an embodiment of the present invention. Detailed Implementation

[0018] like Figures 1-3As shown, this embodiment of the invention is a leakage current module of a miniature leakage current circuit breaker, including a handle 11 rotatably disposed within a housing 10, a latch 12 slidably disposed within the housing 10, a trip latch 13 rotatably disposed within the housing 10 and locked to the latch, a torsion spring 14 disposed between the trip latch 13 and the housing 10, a contact frame 15 rotatably disposed within the housing 10, a spring 16 disposed between the contact frame 15 and the housing 10, a neutral contact 17 that is linked and cooperates with the contact frame 15, and a leakage current tripping assembly 20 disposed within the housing 10 and cooperating with the trip latch 13. The handle 11 is connected to... The connecting rod 18 is connected to the latch 12. One end of the latch 12 is connected to the contact frame 15 via a U-shaped connecting rod 19. The leakage trip assembly 20 includes an electromagnetic trip unit 21, a linkage rod 22 that is slidably disposed in the housing 10 and is linked with the electromagnetic trip unit 21, and a push rod 23 that is rotatably disposed in the housing 10 and is linked with the linkage rod 22. The push rod 23 has a driving surface 231 that abuts against one end of the trip latch 13. The driving surface 231 moves with the push rod 23 and drives the trip latch 13 to move, thereby unlocking the trip latch 13 from the latch 12. The other end of the latch 12 has an arc-shaped locking groove 121 that mates with the jump buckle 13. One end of the jump buckle 13 has an arc-shaped raised bearing surface 131 that mates with the arc-shaped locking groove 121. The arc-shaped locking groove 121 rotates with the latch 12 and can engage with the arc-shaped raised bearing surface 131 of the jump buckle 13, thus locking the latch 12 and the jump buckle 13. The jump buckle has an arc-shaped raised bearing surface that mates with the arc-shaped locking groove, which ensures more sensitive disengagement of the jump buckle and the latch. The handle 11 has a pivot hole 111 for connecting to the connecting rod 18. One end of the connecting rod 18 is inserted into the pivot hole 111. The latch 12 has a drive hole 122 for cooperating with the connecting rod 18. The other end of the connecting rod 18 has a guide rod portion 181 that passes through the housing 10 and is connected to the drive hole 122. The guide rod portion 181 of the connecting rod 18 moves with the handle 11 and slides back and forth within the guide hole 101. The latch is slidably mounted in the housing via the connecting rod, which facilitates the assembly of the latch and the housing and ensures reliable operation of the latch within the housing. The latch can quickly drive the N-line moving contact frame, which helps to accelerate the opening and closing speed of the operating mechanism and improves the reliability of the operation.

[0019] like Figure 2 and 3As shown, one end of the linkage rod 22 has a guide portion 211 that abuts against the push rod of the electromagnetic trip unit 21. The housing 10 has a guide groove 102 that mates with the guide portion 211. The guide portion 211 moves with the linkage rod 22 and slides back and forth within the guide groove 102. The guide portion of the linkage rod is slidably disposed within the guide groove of the housing, thus ensuring reliable sliding of the linkage rod within the housing. The other end of the linkage rod 22 has a snap-fit ​​hole 222. The push rod 23 has a snap-fit ​​post 232 that mates with the snap-fit ​​hole 222. The snap-fit ​​post 232 engages within the snap-fit ​​hole 222, forming a snap-fit ​​engagement between the snap-fit ​​post 232 and the push rod 23. The linkage rod and the push rod are connected by a snap-fit ​​engagement, which facilitates the assembly of the linkage rod and the push rod and ensures more reliable transmission between them. The housing 10 contains a rotating shaft 103 that mates with the push rod 23. The push rod 23 has a positioning hole 233 that mates with the rotating shaft 103. The rotating shaft 103 passes through the positioning hole 233, forming a rotatable connection between the rotating shaft 103 and the push rod 23. The push rod is rotatably mounted on the rotating shaft within the housing, facilitating assembly of the push rod and the rotating shaft, making assembly more convenient, and ensuring reliable rotation of the push rod within the housing. A contact torsion spring 170 is provided between the contact frame 15 and the N-line moving contact 17. The contact torsion spring 170 engages with the positioning boss 151 of the contact frame 15, and its two ends engage with the first limiting groove 171 and the second limiting groove 172 of the N-line moving contact 17, respectively. The contact torsion spring can increase the contact pressure of the N-line moving contact, thereby ensuring that the N-line moving contact can reliably contact the N-line stationary contact. Furthermore, the N-line moving contact and the contact frame are assembled by a snap-fit ​​method, which helps to improve the assembly efficiency of the N-line moving contact and the contact frame.

[0020] The handle, latch, trip latch, and contact frame employ a four-bar linkage design, ensuring a balanced distribution of operating torque for the leakage current module and preventing excessive or insufficient force during operation, thus enhancing operational flexibility. The latch utilizes a sliding design; the handle drives the latch to slide via a linkage, and the latch, through a U-shaped linkage, drives the neutral wire contact frame to quickly perform opening and closing actions, enabling rapid opening and closing of the circuit breaker and a faster operating mechanism. During leakage current tripping, the latch's arc-shaped locking groove engages with the trip latch. The electromagnetic trip unit and bimetallic strip can then independently drive the trip latch, allowing for rapid unlocking of the latch, resulting in more sensitive and reliable tripping. Therefore, this miniature circuit breaker's leakage current module boasts advantages such as simple structure, stable and reliable performance, fast opening and closing speed, flexible operation, and sensitive tripping action.

Claims

1. A residual current module for a miniature residual current circuit breaker, characterized in that: The device includes a handle rotatably disposed within a housing, a latch slidably disposed within a housing, a trip latch rotatably disposed within a housing and locked to the latch, a torsion spring disposed between the trip latch and the housing, a contact frame rotatably disposed within a housing, a spring disposed between the contact frame and the housing, a neutral linear contact that is linked to the contact frame, and a leakage current tripping assembly disposed within a housing and cooperating with the trip latch. The handle is connected to the latch via a connecting rod, and one end of the latch is connected to the contact frame via a U-shaped connecting rod. The leakage current tripping assembly includes an electromagnetic trip unit, a linkage rod slidably disposed within a housing and linked to the electromagnetic trip unit, and a push rod rotatably disposed within a housing and linked to the linkage rod. The push rod has a driving surface that abuts against one end of the trip latch. The driving surface moves with the push rod and drives the trip latch to move, thereby unlocking the trip latch and the latch.

2. The leakage current module of the miniature leakage current circuit breaker according to claim 1, characterized in that: The other end of the latch has an arc-shaped locking groove that mates with the jump buckle. One end of the jump buckle has an arc-shaped protruding bearing surface that mates with the arc-shaped locking groove. The arc-shaped locking groove rotates with the latch and can engage with the arc-shaped protruding bearing surface of the jump buckle, thereby locking the latch and the jump buckle.

3. The leakage current module of the miniature leakage current circuit breaker according to claim 1 or 2, characterized in that: The handle is provided with a pivot hole for connecting the connecting rod. One end of the connecting rod is inserted into the pivot hole. The latch is provided with a drive hole that cooperates with the connecting rod. The other end of the connecting rod has a guide hole that passes through the housing and is connected to a guide rod in the drive hole. The guide rod of the connecting rod moves with the handle and slides back and forth in the guide hole.

4. The leakage current module of the miniature leakage current circuit breaker according to claim 1 or 2, characterized in that: One end of the linkage rod has a guide portion that abuts against the push rod of the electromagnetic trip device. The housing is provided with a guide groove that cooperates with the guide portion. The guide portion moves with the linkage rod and slides back and forth in the guide groove.

5. The leakage current module of the miniature leakage current circuit breaker according to claim 4, characterized in that: The other end of the linkage rod has a snap-fit ​​hole, and the push rod is provided with a snap-fit ​​hole. A snap-fit ​​pin that mates with a connector hole, wherein the snap-fit ​​pin engages within the snap-fit ​​hole, and thus forms a snap-fit ​​engagement between the snap-fit ​​pin and the push rod.

6. The leakage current module of the miniature leakage current circuit breaker according to claim 1 or 2, characterized in that: The housing contains a rotating shaft that mates with a push rod. The push rod has a positioning hole that mates with the rotating shaft. The rotating shaft passes through the positioning hole, forming a rotatable connection between the rotating shaft and the push rod.

7. The leakage current module of the miniature leakage current circuit breaker according to claim 1 or 2, characterized in that: A contact torsion spring is provided between the contact frame and the N-line moving contact. The contact torsion spring is engaged with the positioning boss of the contact frame, and the two ends of the contact torsion spring are respectively engaged in the first limiting groove and the second limiting groove of the N-line moving contact.

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